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@@ -457,7 +457,7 @@ export class ErrorHandler {
 &nbsp;
     // Log detailed error for debugging
     console.error(
-      `[OllamaPlugin${context ? ' ' + context : ''}] ${error instanceof Error ? error.message : 'Unknown error'}`
+      `[OllamaPlugin${context ? <span class="branch-0 cbranch-no" title="branch not covered" >' ' + context </span>: ''}] ${error instanceof Error ? error.message : 'Unknown error'}`
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     if (error instanceof Error) {
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@@ -604,7 +604,7 @@ export class ErrorHandler {
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-                at 2026-05-04T18:57:30.341Z
+                at 2026-05-04T22:31:13.164Z
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index 832d5c6..a8be7d5 100644
--- a/coverage/lcov-report/index.html
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 </thead>
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+	</td>
+	<td data-value="84.37" class="pct high">84.37%</td>
+	<td data-value="64" class="abs high">54/64</td>
+	<td data-value="80" class="pct high">80%</td>
+	<td data-value="50" class="abs high">40/50</td>
+	<td data-value="100" class="pct high">100%</td>
+	<td data-value="10" class="abs high">10/10</td>
+	<td data-value="84.37" class="pct high">84.37%</td>
+	<td data-value="64" class="abs high">54/64</td>
+	</tr>
+
+<tr>
+	<td class="file high" data-value="tool-executor.ts"><a href="tool-executor.ts.html">tool-executor.ts</a></td>
+	<td data-value="100" class="pic high">
+	<div class="chart"><div class="cover-fill cover-full" style="width: 100%"></div><div class="cover-empty" style="width: 0%"></div></div>
+	</td>
+	<td data-value="100" class="pct high">100%</td>
+	<td data-value="24" class="abs high">24/24</td>
+	<td data-value="83.33" class="pct high">83.33%</td>
+	<td data-value="12" class="abs high">10/12</td>
+	<td data-value="100" class="pct high">100%</td>
+	<td data-value="2" class="abs high">2/2</td>
+	<td data-value="100" class="pct high">100%</td>
+	<td data-value="24" class="abs high">24/24</td>
+	</tr>
+
+<tr>
+	<td class="file high" data-value="types.ts"><a href="types.ts.html">types.ts</a></td>
+	<td data-value="100" class="pic high">
+	<div class="chart"><div class="cover-fill cover-full" style="width: 100%"></div><div class="cover-empty" style="width: 0%"></div></div>
+	</td>
+	<td data-value="100" class="pct high">100%</td>
+	<td data-value="37" class="abs high">37/37</td>
+	<td data-value="100" class="pct high">100%</td>
+	<td data-value="2" class="abs high">2/2</td>
+	<td data-value="100" class="pct high">100%</td>
+	<td data-value="8" class="abs high">8/8</td>
+	<td data-value="100" class="pct high">100%</td>
+	<td data-value="37" class="abs high">37/37</td>
+	</tr>
+
+<tr>
+	<td class="file medium" data-value="utils.ts"><a href="utils.ts.html">utils.ts</a></td>
+	<td data-value="72.22" class="pic medium">
+	<div class="chart"><div class="cover-fill" style="width: 72%"></div><div class="cover-empty" style="width: 28%"></div></div>
+	</td>
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+
+<tr>
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+                at 2026-05-04T22:31:13.164Z
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index da36feb..6f9d615 100644
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 <span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">import { Vault, TFile, Notice, App } from 'obsidian';
 import { ToolCall, ToolResult, ToolExecutionError, PathValidationError } from './types';
-import { validatePath } from './utils';
+import { validatePath, safeParseJson } from './utils';
 &nbsp;
 export class ToolExecutor {
   private vault: Vault;
@@ -206,7 +206,7 @@ export class ToolExecutor {
         let filePath: string, content: string;
         try {
           // Handle both string (JSON) and object arguments, since some Ollama versions return args as an object
-          const parsedArgs = typeof args === 'string' ? JSON.parse(args) : args;
+          const parsedArgs = typeof args === 'string' ? safeParseJson(args) : args;
           filePath = parsedArgs.path;
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         } catch (e) {
@@ -250,7 +250,7 @@ export class ToolExecutor {
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 <span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">export interface PluginSettings {
   ollamaUrl: string;
   model: string;
@@ -465,6 +709,128 @@ export interface ChatMessage {
   isStreaming?: boolean;
   tool_calls?: ToolCall[];
 }
+&nbsp;
+/**
+ * API Response Types
+ */
+&nbsp;
+export interface OllamaChatResponse {
+  model: string;
+  created_at: string;
+  message: {
+    role: 'assistant';
+    content: string;
+    tool_calls?: ToolCall[];
+  };
+  done: boolean;
+  total_duration?: number;
+  load_duration?: number;
+  prompt_eval_count?: number;
+  eval_count?: number;
+}
+&nbsp;
+export interface OllamaStreamResponse {
+  model: string;
+  created_at: string;
+  message: {
+    role: 'assistant';
+    content: string;
+    tool_calls?: ToolCall[];
+  };
+  done: boolean;
+}
+&nbsp;
+export interface OllamaErrorResponse {
+  error: string;
+}
+&nbsp;
+export interface OllamaModelList {
+  models: Array&lt;{
+    name: string;
+    id: string;
+    modified_at: string;
+    size: number;
+  }&gt;;
+}
+&nbsp;
+export interface OllamaGenerateResponse {
+  model: string;
+  created_at: string;
+  response: string;
+  done: boolean;
+  context?: number[];
+  total_duration?: number;
+  load_duration?: number;
+  prompt_eval_count?: number;
+  eval_count?: number;
+}
+&nbsp;
+export interface OllamaPullStatus {
+  status: string;
+  digest: string;
+  total_size: number;
+  completed_size: number;
+}
+&nbsp;
+export interface OllamaEmbeddingResponse {
+  embeddings: number[];
+  model: string;
+  total_duration?: number;
+  load_duration?: number;
+  prompt_eval_count?: number;
+  eval_count?: number;
+}
+&nbsp;
+/**
+ * Client Configuration Types
+ */
+&nbsp;
+export interface OllamaClientConfig {
+  url: string;
+  model: string;
+  timeout?: number;
+  maxRetries?: number;
+}
+&nbsp;
+export interface OllamaRequestOptions {
+  timeout?: number;
+  signal?: AbortSignal;
+}
+&nbsp;
+/**
+ * Streaming Types
+ */
+&nbsp;
+export interface StreamChunk {
+  content: string;
+  tool_calls?: ToolCall[];
+  done?: boolean;
+  error?: string;
+}
+&nbsp;
+export interface StreamMetadata {
+  model: string;
+  created_at: string;
+  done: boolean;
+  total_duration?: number;
+  load_duration?: number;
+}
+&nbsp;
+export interface ChatSession {
+  id: string;
+  messages: OllamaMessage[];
+  createdAt: number;
+  model: string;
+}
+&nbsp;
+export interface ToolDefinition {
+  type: 'function';
+  function: {
+    name: string;
+    description: string;
+    parameters: Record&lt;string, any&gt;;
+  };
+}
 &nbsp;</pre></td></tr></table></pre>
 
                 <div class='push'></div><!-- for sticky footer -->
@@ -472,7 +838,7 @@ export interface ChatMessage {
             <div class='footer quiet pad2 space-top1 center small'>
                 Code coverage generated by
                 <a href="https://istanbul.js.org/" target="_blank" rel="noopener noreferrer">istanbul</a>
-                at 2026-05-04T18:57:30.341Z
+                at 2026-05-04T22:31:13.164Z
             </div>
         <script src="prettify.js"></script>
         <script>
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@@ -23,30 +23,30 @@
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+                <span class="strong">72.22% </span>
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+                <span class='fraction'>45/66</span>
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+    <div class='status-line medium'></div>
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+<a name='L101'></a><a href='#L101'>101</a>
+<a name='L102'></a><a href='#L102'>102</a>
+<a name='L103'></a><a href='#L103'>103</a>
+<a name='L104'></a><a href='#L104'>104</a>
+<a name='L105'></a><a href='#L105'>105</a>
+<a name='L106'></a><a href='#L106'>106</a>
+<a name='L107'></a><a href='#L107'>107</a>
+<a name='L108'></a><a href='#L108'>108</a>
+<a name='L109'></a><a href='#L109'>109</a>
+<a name='L110'></a><a href='#L110'>110</a>
+<a name='L111'></a><a href='#L111'>111</a>
+<a name='L112'></a><a href='#L112'>112</a>
+<a name='L113'></a><a href='#L113'>113</a>
+<a name='L114'></a><a href='#L114'>114</a>
+<a name='L115'></a><a href='#L115'>115</a>
+<a name='L116'></a><a href='#L116'>116</a>
+<a name='L117'></a><a href='#L117'>117</a>
+<a name='L118'></a><a href='#L118'>118</a>
+<a name='L119'></a><a href='#L119'>119</a>
+<a name='L120'></a><a href='#L120'>120</a>
+<a name='L121'></a><a href='#L121'>121</a>
+<a name='L122'></a><a href='#L122'>122</a>
+<a name='L123'></a><a href='#L123'>123</a>
+<a name='L124'></a><a href='#L124'>124</a>
+<a name='L125'></a><a href='#L125'>125</a>
+<a name='L126'></a><a href='#L126'>126</a>
+<a name='L127'></a><a href='#L127'>127</a>
+<a name='L128'></a><a href='#L128'>128</a>
+<a name='L129'></a><a href='#L129'>129</a>
+<a name='L130'></a><a href='#L130'>130</a>
+<a name='L131'></a><a href='#L131'>131</a>
+<a name='L132'></a><a href='#L132'>132</a>
+<a name='L133'></a><a href='#L133'>133</a>
+<a name='L134'></a><a href='#L134'>134</a>
+<a name='L135'></a><a href='#L135'>135</a>
+<a name='L136'></a><a href='#L136'>136</a>
+<a name='L137'></a><a href='#L137'>137</a>
+<a name='L138'></a><a href='#L138'>138</a>
+<a name='L139'></a><a href='#L139'>139</a>
+<a name='L140'></a><a href='#L140'>140</a>
+<a name='L141'></a><a href='#L141'>141</a>
+<a name='L142'></a><a href='#L142'>142</a>
+<a name='L143'></a><a href='#L143'>143</a>
+<a name='L144'></a><a href='#L144'>144</a>
+<a name='L145'></a><a href='#L145'>145</a>
+<a name='L146'></a><a href='#L146'>146</a>
+<a name='L147'></a><a href='#L147'>147</a>
+<a name='L148'></a><a href='#L148'>148</a>
+<a name='L149'></a><a href='#L149'>149</a>
+<a name='L150'></a><a href='#L150'>150</a>
+<a name='L151'></a><a href='#L151'>151</a>
+<a name='L152'></a><a href='#L152'>152</a>
+<a name='L153'></a><a href='#L153'>153</a>
+<a name='L154'></a><a href='#L154'>154</a>
+<a name='L155'></a><a href='#L155'>155</a>
+<a name='L156'></a><a href='#L156'>156</a>
+<a name='L157'></a><a href='#L157'>157</a>
+<a name='L158'></a><a href='#L158'>158</a>
+<a name='L159'></a><a href='#L159'>159</a>
+<a name='L160'></a><a href='#L160'>160</a>
+<a name='L161'></a><a href='#L161'>161</a>
+<a name='L162'></a><a href='#L162'>162</a>
+<a name='L163'></a><a href='#L163'>163</a>
+<a name='L164'></a><a href='#L164'>164</a>
+<a name='L165'></a><a href='#L165'>165</a>
+<a name='L166'></a><a href='#L166'>166</a>
+<a name='L167'></a><a href='#L167'>167</a>
+<a name='L168'></a><a href='#L168'>168</a>
+<a name='L169'></a><a href='#L169'>169</a>
+<a name='L170'></a><a href='#L170'>170</a>
+<a name='L171'></a><a href='#L171'>171</a>
+<a name='L172'></a><a href='#L172'>172</a>
+<a name='L173'></a><a href='#L173'>173</a>
+<a name='L174'></a><a href='#L174'>174</a>
+<a name='L175'></a><a href='#L175'>175</a>
+<a name='L176'></a><a href='#L176'>176</a>
+<a name='L177'></a><a href='#L177'>177</a>
+<a name='L178'></a><a href='#L178'>178</a>
+<a name='L179'></a><a href='#L179'>179</a>
+<a name='L180'></a><a href='#L180'>180</a>
+<a name='L181'></a><a href='#L181'>181</a>
+<a name='L182'></a><a href='#L182'>182</a>
+<a name='L183'></a><a href='#L183'>183</a>
+<a name='L184'></a><a href='#L184'>184</a>
+<a name='L185'></a><a href='#L185'>185</a>
+<a name='L186'></a><a href='#L186'>186</a>
+<a name='L187'></a><a href='#L187'>187</a>
+<a name='L188'></a><a href='#L188'>188</a>
+<a name='L189'></a><a href='#L189'>189</a>
+<a name='L190'></a><a href='#L190'>190</a>
+<a name='L191'></a><a href='#L191'>191</a>
+<a name='L192'></a><a href='#L192'>192</a>
+<a name='L193'></a><a href='#L193'>193</a>
+<a name='L194'></a><a href='#L194'>194</a>
+<a name='L195'></a><a href='#L195'>195</a>
+<a name='L196'></a><a href='#L196'>196</a>
+<a name='L197'></a><a href='#L197'>197</a>
+<a name='L198'></a><a href='#L198'>198</a>
+<a name='L199'></a><a href='#L199'>199</a>
+<a name='L200'></a><a href='#L200'>200</a>
+<a name='L201'></a><a href='#L201'>201</a>
+<a name='L202'></a><a href='#L202'>202</a>
+<a name='L203'></a><a href='#L203'>203</a>
+<a name='L204'></a><a href='#L204'>204</a>
+<a name='L205'></a><a href='#L205'>205</a>
+<a name='L206'></a><a href='#L206'>206</a>
+<a name='L207'></a><a href='#L207'>207</a>
+<a name='L208'></a><a href='#L208'>208</a>
+<a name='L209'></a><a href='#L209'>209</a>
+<a name='L210'></a><a href='#L210'>210</a>
+<a name='L211'></a><a href='#L211'>211</a>
+<a name='L212'></a><a href='#L212'>212</a>
+<a name='L213'></a><a href='#L213'>213</a>
+<a name='L214'></a><a href='#L214'>214</a>
+<a name='L215'></a><a href='#L215'>215</a>
+<a name='L216'></a><a href='#L216'>216</a>
+<a name='L217'></a><a href='#L217'>217</a>
+<a name='L218'></a><a href='#L218'>218</a>
+<a name='L219'></a><a href='#L219'>219</a>
+<a name='L220'></a><a href='#L220'>220</a>
+<a name='L221'></a><a href='#L221'>221</a>
+<a name='L222'></a><a href='#L222'>222</a>
+<a name='L223'></a><a href='#L223'>223</a>
+<a name='L224'></a><a href='#L224'>224</a>
+<a name='L225'></a><a href='#L225'>225</a>
+<a name='L226'></a><a href='#L226'>226</a>
+<a name='L227'></a><a href='#L227'>227</a>
+<a name='L228'></a><a href='#L228'>228</a>
+<a name='L229'></a><a href='#L229'>229</a>
+<a name='L230'></a><a href='#L230'>230</a>
+<a name='L231'></a><a href='#L231'>231</a>
+<a name='L232'></a><a href='#L232'>232</a>
+<a name='L233'></a><a href='#L233'>233</a>
+<a name='L234'></a><a href='#L234'>234</a>
+<a name='L235'></a><a href='#L235'>235</a>
+<a name='L236'></a><a href='#L236'>236</a>
+<a name='L237'></a><a href='#L237'>237</a>
+<a name='L238'></a><a href='#L238'>238</a>
+<a name='L239'></a><a href='#L239'>239</a>
+<a name='L240'></a><a href='#L240'>240</a>
+<a name='L241'></a><a href='#L241'>241</a>
+<a name='L242'></a><a href='#L242'>242</a>
+<a name='L243'></a><a href='#L243'>243</a>
+<a name='L244'></a><a href='#L244'>244</a>
+<a name='L245'></a><a href='#L245'>245</a>
+<a name='L246'></a><a href='#L246'>246</a>
+<a name='L247'></a><a href='#L247'>247</a>
+<a name='L248'></a><a href='#L248'>248</a>
+<a name='L249'></a><a href='#L249'>249</a>
+<a name='L250'></a><a href='#L250'>250</a>
+<a name='L251'></a><a href='#L251'>251</a>
+<a name='L252'></a><a href='#L252'>252</a>
+<a name='L253'></a><a href='#L253'>253</a>
+<a name='L254'></a><a href='#L254'>254</a>
+<a name='L255'></a><a href='#L255'>255</a>
+<a name='L256'></a><a href='#L256'>256</a>
+<a name='L257'></a><a href='#L257'>257</a>
+<a name='L258'></a><a href='#L258'>258</a>
+<a name='L259'></a><a href='#L259'>259</a>
+<a name='L260'></a><a href='#L260'>260</a>
+<a name='L261'></a><a href='#L261'>261</a>
+<a name='L262'></a><a href='#L262'>262</a>
+<a name='L263'></a><a href='#L263'>263</a>
+<a name='L264'></a><a href='#L264'>264</a>
+<a name='L265'></a><a href='#L265'>265</a>
+<a name='L266'></a><a href='#L266'>266</a>
+<a name='L267'></a><a href='#L267'>267</a>
+<a name='L268'></a><a href='#L268'>268</a>
+<a name='L269'></a><a href='#L269'>269</a>
+<a name='L270'></a><a href='#L270'>270</a>
+<a name='L271'></a><a href='#L271'>271</a>
+<a name='L272'></a><a href='#L272'>272</a>
+<a name='L273'></a><a href='#L273'>273</a>
+<a name='L274'></a><a href='#L274'>274</a>
+<a name='L275'></a><a href='#L275'>275</a>
+<a name='L276'></a><a href='#L276'>276</a>
+<a name='L277'></a><a href='#L277'>277</a>
+<a name='L278'></a><a href='#L278'>278</a>
+<a name='L279'></a><a href='#L279'>279</a>
+<a name='L280'></a><a href='#L280'>280</a>
+<a name='L281'></a><a href='#L281'>281</a>
+<a name='L282'></a><a href='#L282'>282</a>
+<a name='L283'></a><a href='#L283'>283</a>
+<a name='L284'></a><a href='#L284'>284</a>
+<a name='L285'></a><a href='#L285'>285</a>
+<a name='L286'></a><a href='#L286'>286</a>
+<a name='L287'></a><a href='#L287'>287</a>
+<a name='L288'></a><a href='#L288'>288</a>
+<a name='L289'></a><a href='#L289'>289</a>
+<a name='L290'></a><a href='#L290'>290</a>
+<a name='L291'></a><a href='#L291'>291</a>
+<a name='L292'></a><a href='#L292'>292</a>
+<a name='L293'></a><a href='#L293'>293</a>
+<a name='L294'></a><a href='#L294'>294</a>
+<a name='L295'></a><a href='#L295'>295</a>
+<a name='L296'></a><a href='#L296'>296</a>
+<a name='L297'></a><a href='#L297'>297</a>
+<a name='L298'></a><a href='#L298'>298</a>
+<a name='L299'></a><a href='#L299'>299</a>
+<a name='L300'></a><a href='#L300'>300</a>
+<a name='L301'></a><a href='#L301'>301</a>
+<a name='L302'></a><a href='#L302'>302</a>
+<a name='L303'></a><a href='#L303'>303</a>
+<a name='L304'></a><a href='#L304'>304</a>
+<a name='L305'></a><a href='#L305'>305</a>
+<a name='L306'></a><a href='#L306'>306</a>
+<a name='L307'></a><a href='#L307'>307</a>
+<a name='L308'></a><a href='#L308'>308</a>
+<a name='L309'></a><a href='#L309'>309</a>
+<a name='L310'></a><a href='#L310'>310</a>
+<a name='L311'></a><a href='#L311'>311</a>
+<a name='L312'></a><a href='#L312'>312</a>
+<a name='L313'></a><a href='#L313'>313</a>
+<a name='L314'></a><a href='#L314'>314</a>
+<a name='L315'></a><a href='#L315'>315</a>
+<a name='L316'></a><a href='#L316'>316</a>
+<a name='L317'></a><a href='#L317'>317</a>
+<a name='L318'></a><a href='#L318'>318</a>
+<a name='L319'></a><a href='#L319'>319</a>
+<a name='L320'></a><a href='#L320'>320</a>
+<a name='L321'></a><a href='#L321'>321</a>
+<a name='L322'></a><a href='#L322'>322</a>
+<a name='L323'></a><a href='#L323'>323</a>
+<a name='L324'></a><a href='#L324'>324</a>
+<a name='L325'></a><a href='#L325'>325</a>
+<a name='L326'></a><a href='#L326'>326</a>
+<a name='L327'></a><a href='#L327'>327</a>
+<a name='L328'></a><a href='#L328'>328</a>
+<a name='L329'></a><a href='#L329'>329</a>
+<a name='L330'></a><a href='#L330'>330</a>
+<a name='L331'></a><a href='#L331'>331</a>
+<a name='L332'></a><a href='#L332'>332</a>
+<a name='L333'></a><a href='#L333'>333</a>
+<a name='L334'></a><a href='#L334'>334</a>
+<a name='L335'></a><a href='#L335'>335</a>
+<a name='L336'></a><a href='#L336'>336</a>
+<a name='L337'></a><a href='#L337'>337</a>
+<a name='L338'></a><a href='#L338'>338</a>
+<a name='L339'></a><a href='#L339'>339</a>
+<a name='L340'></a><a href='#L340'>340</a>
+<a name='L341'></a><a href='#L341'>341</a>
+<a name='L342'></a><a href='#L342'>342</a>
+<a name='L343'></a><a href='#L343'>343</a>
+<a name='L344'></a><a href='#L344'>344</a>
+<a name='L345'></a><a href='#L345'>345</a>
+<a name='L346'></a><a href='#L346'>346</a>
+<a name='L347'></a><a href='#L347'>347</a>
+<a name='L348'></a><a href='#L348'>348</a>
+<a name='L349'></a><a href='#L349'>349</a>
+<a name='L350'></a><a href='#L350'>350</a>
+<a name='L351'></a><a href='#L351'>351</a>
+<a name='L352'></a><a href='#L352'>352</a>
+<a name='L353'></a><a href='#L353'>353</a>
+<a name='L354'></a><a href='#L354'>354</a>
+<a name='L355'></a><a href='#L355'>355</a>
+<a name='L356'></a><a href='#L356'>356</a>
+<a name='L357'></a><a href='#L357'>357</a>
+<a name='L358'></a><a href='#L358'>358</a>
+<a name='L359'></a><a href='#L359'>359</a>
+<a name='L360'></a><a href='#L360'>360</a>
+<a name='L361'></a><a href='#L361'>361</a>
+<a name='L362'></a><a href='#L362'>362</a>
+<a name='L363'></a><a href='#L363'>363</a>
+<a name='L364'></a><a href='#L364'>364</a>
+<a name='L365'></a><a href='#L365'>365</a>
+<a name='L366'></a><a href='#L366'>366</a>
+<a name='L367'></a><a href='#L367'>367</a>
+<a name='L368'></a><a href='#L368'>368</a>
+<a name='L369'></a><a href='#L369'>369</a>
+<a name='L370'></a><a href='#L370'>370</a>
+<a name='L371'></a><a href='#L371'>371</a>
+<a name='L372'></a><a href='#L372'>372</a>
+<a name='L373'></a><a href='#L373'>373</a>
+<a name='L374'></a><a href='#L374'>374</a></td><td class="line-coverage quiet"><span class="cline-any cline-neutral">&nbsp;</span>
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 <span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">/**
+ * Logging utility for consistent log formatting and levels
+ * Provides standardized logging across the plugin
+ */
+&nbsp;
+export enum LogLevel {
+  DEBUG = 'debug',
+  INFO = 'info',
+  WARN = 'warn',
+  ERROR = 'error',
+}
+&nbsp;
+/**
+ * Centralized logging utility with consistent formatting
+ */
+export class Logger {
+  private static currentLevel: LogLevel = LogLevel.INFO;
+&nbsp;
+  /**
+   * Set the current log level
+   * @param level The minimum log level to output
+   */
+<span class="fstat-no" title="function not covered" >  static </span>setLevel(level: LogLevel): void {
+<span class="cstat-no" title="statement not covered" >    this.currentLevel = level;</span>
+  }
+&nbsp;
+  /**
+   * Get the current log level
+   * @returns The current log level
+   */
+<span class="fstat-no" title="function not covered" >  static </span>getLevel(): LogLevel {
+<span class="cstat-no" title="statement not covered" >    return this.currentLevel;</span>
+  }
+&nbsp;
+  /**
+   * Log a debug message
+   * @param message The message to log
+   * @param context Additional context (e.g., component name)
+   */
+<span class="fstat-no" title="function not covered" >  static </span>debug(message: string, context?: string): void {
+<span class="cstat-no" title="statement not covered" >    <span class="missing-if-branch" title="if path not taken" >I</span>if (this.currentLevel &lt;= LogLevel.DEBUG) {</span>
+<span class="cstat-no" title="statement not covered" >      this.log(LogLevel.DEBUG, message, context);</span>
+    }
+  }
+&nbsp;
+  /**
+   * Log an info message
+   * @param message The message to log
+   * @param context Additional context (e.g., component name)
+   */
+<span class="fstat-no" title="function not covered" >  static </span>info(message: string, context?: string): void {
+<span class="cstat-no" title="statement not covered" >    <span class="missing-if-branch" title="if path not taken" >I</span>if (this.currentLevel &lt;= LogLevel.INFO) {</span>
+<span class="cstat-no" title="statement not covered" >      this.log(LogLevel.INFO, message, context);</span>
+    }
+  }
+&nbsp;
+  /**
+   * Log a warning message
+   * @param message The message to log
+   * @param context Additional context (e.g., component name)
+   */
+<span class="fstat-no" title="function not covered" >  static </span>warn(message: string, context?: string): void {
+<span class="cstat-no" title="statement not covered" >    <span class="missing-if-branch" title="if path not taken" >I</span>if (this.currentLevel &lt;= LogLevel.WARN) {</span>
+<span class="cstat-no" title="statement not covered" >      this.log(LogLevel.WARN, message, context);</span>
+    }
+  }
+&nbsp;
+  /**
+   * Log an error message
+   * @param message The message to log
+   * @param context Additional context (e.g., component name)
+   */
+<span class="fstat-no" title="function not covered" >  static </span>error(message: string, context?: string, error?: unknown): void {
+<span class="cstat-no" title="statement not covered" >    <span class="missing-if-branch" title="if path not taken" >I</span>if (this.currentLevel &lt;= LogLevel.ERROR) {</span>
+<span class="cstat-no" title="statement not covered" >      this.log(LogLevel.ERROR, message, context);</span>
+<span class="cstat-no" title="statement not covered" >      <span class="missing-if-branch" title="if path not taken" >I</span>if (error) {</span>
+<span class="cstat-no" title="statement not covered" >        console.error('[Error Details]', error instanceof Error ? error.stack : error);</span>
+      }
+    }
+  }
+&nbsp;
+  /**
+   * Internal log method with consistent formatting
+   * @param level The log level
+   * @param message The message to log
+   * @param context Additional context
+   */
+  private <span class="fstat-no" title="function not covered" >static </span>log(level: LogLevel, message: string, context?: string): void {
+    const timestamp = <span class="cstat-no" title="statement not covered" >new Date().toISOString();</span>
+    const levelStr = <span class="cstat-no" title="statement not covered" >level.toUpperCase();</span>
+    const contextStr = <span class="cstat-no" title="statement not covered" >context ? `[${context}]` : '';</span>
+    const formattedMessage = <span class="cstat-no" title="statement not covered" >`[${timestamp}] ${levelStr} ${contextStr} ${message}`;</span>
+&nbsp;
+<span class="cstat-no" title="statement not covered" >    switch (level) {</span>
+      case LogLevel.DEBUG:
+<span class="cstat-no" title="statement not covered" >        console.debug(formattedMessage);</span>
+<span class="cstat-no" title="statement not covered" >        break;</span>
+      case LogLevel.INFO:
+<span class="cstat-no" title="statement not covered" >        console.info(formattedMessage);</span>
+<span class="cstat-no" title="statement not covered" >        break;</span>
+      case LogLevel.WARN:
+<span class="cstat-no" title="statement not covered" >        console.warn(formattedMessage);</span>
+<span class="cstat-no" title="statement not covered" >        break;</span>
+      case LogLevel.ERROR:
+<span class="cstat-no" title="statement not covered" >        console.error(formattedMessage);</span>
+<span class="cstat-no" title="statement not covered" >        break;</span>
+    }
+  }
+&nbsp;
+  /**
+   * Log a performance measurement
+   * @param operation The operation being measured
+   * @param durationMs The duration in milliseconds
+   * @param context Additional context
+   */
+<span class="fstat-no" title="function not covered" >  static </span>perf(operation: string, durationMs: number, context?: string): void {
+<span class="cstat-no" title="statement not covered" >    this.info(`Performance: ${operation} took ${durationMs.toFixed(2)}ms`, context);</span>
+  }
+&nbsp;
+  /**
+   * Log a deprecated feature usage
+   * @param feature The deprecated feature being used
+   * @param replacement The replacement feature
+   * @param context Additional context
+   */
+<span class="fstat-no" title="function not covered" >  static </span>deprecated(feature: string, replacement: string, context?: string): void {
+<span class="cstat-no" title="statement not covered" >    this.warn(`Deprecated: ${feature} is deprecated. Use ${replacement} instead.`, context);</span>
+  }
+}
+&nbsp;
+/**
  * Normalizes file paths for browser/ Obsidian environment
  * Replaces multiple slashes with single slash and handles forward/backward slashes
  */
+&nbsp;
+/**
+ * Validates the Ollama URL configuration
+ * @param url The URL to validate
+ * @returns Object with validation result and error message if invalid
+ */
+export function validateOllamaUrl(url: string): { valid: boolean; error?: string } {
+  if (!url || typeof url !== 'string') {
+    return { valid: false, error: 'Ollama URL cannot be empty' };
+  }
+&nbsp;
+  // Trim whitespace
+  const trimmedUrl = url.trim();
+  <span class="missing-if-branch" title="if path not taken" >I</span>if (trimmedUrl.length === 0) {
+<span class="cstat-no" title="statement not covered" >    return { valid: false, error: 'Ollama URL cannot be empty' };</span>
+  }
+&nbsp;
+  // Validate URL format
+  if (!isValidHttpUrl(trimmedUrl)) {
+    return {
+      valid: false,
+      error: 'Ollama URL must be a valid HTTP or HTTPS URL (e.g., http://localhost:11434)',
+    };
+  }
+&nbsp;
+  // Check for common mistakes
+  if (trimmedUrl.endsWith('/')) {
+    return { valid: false, error: 'Ollama URL should not end with a slash' };
+  }
+&nbsp;
+  return { valid: true };
+}
+&nbsp;
+/**
+ * Validates the Ollama model name configuration
+ * @param modelName The model name to validate
+ * @returns Object with validation result and error message if invalid
+ */
+export function validateModelName(modelName: string): { valid: boolean; error?: string } {
+  if (!modelName || typeof modelName !== 'string') {
+    return { valid: false, error: 'Model name cannot be empty' };
+  }
+&nbsp;
+  const trimmedModel = modelName.trim();
+  <span class="missing-if-branch" title="if path not taken" >I</span>if (trimmedModel.length === 0) {
+<span class="cstat-no" title="statement not covered" >    return { valid: false, error: 'Model name cannot be empty' };</span>
+  }
+&nbsp;
+  // Model names should be alphanumeric with optional dots, dashes, and underscores
+  const modelNameRegex = /^[a-zA-Z0-9._-]+$/;
+  if (!modelNameRegex.test(trimmedModel)) {
+    return {
+      valid: false,
+      error: 'Model name can only contain letters, numbers, dots, dashes, and underscores',
+    };
+  }
+&nbsp;
+  // Check length constraints
+  if (trimmedModel.length &lt; 2) {
+    return { valid: false, error: 'Model name must be at least 2 characters long' };
+  }
+&nbsp;
+  if (trimmedModel.length &gt; 100) {
+    return { valid: false, error: 'Model name must be less than 100 characters long' };
+  }
+&nbsp;
+  return { valid: true };
+}
+&nbsp;
+/**
+ * Validates plugin settings before saving
+ * @param settings The settings to validate
+ * @returns Array of validation errors, empty if all valid
+ */
+export function validatePluginSettings(settings: any): string[] {
+  const errors: string[] = [];
+&nbsp;
+  if (settings.ollamaUrl) {
+    const urlValidation = validateOllamaUrl(settings.ollamaUrl);
+    if (!urlValidation.valid) {
+      errors.push(`Ollama URL: ${urlValidation.error}`);
+    }
+  }
+&nbsp;
+  if (settings.model) {
+    const modelValidation = validateModelName(settings.model);
+    if (!modelValidation.valid) {
+      errors.push(`Model: ${modelValidation.error}`);
+    }
+  }
+&nbsp;
+  return errors;
+}
 export function normalizePath(path: string): string {
   // Replace multiple slashes with single slash
   let normalized = path.replace(/[\\\/]+/g, '/');
@@ -186,6 +1051,104 @@ export function normalizePath(path: string): string {
 /**
  * Validates a path string for safety (no traversal, no absolute paths, no invalid chars)
  */
+/**
+ * Validates a URL string to ensure it's a proper HTTP or HTTPS URL
+ */
+export function isValidHttpUrl(string: string): boolean {
+  let url;
+  try {
+    url = new URL(string);
+  } catch (_) {
+    return false;
+  }
+  return url.protocol === 'http:' || url.protocol === 'https:';
+}
+&nbsp;
+/**
+ * Safely parses JSON with validation to prevent code injection
+ * @param text The JSON string to parse
+ * @param maxDepth Maximum allowed nesting depth (prevents DoS via deeply nested JSON)
+ * @param maxSize Maximum allowed size in characters (prevents DoS via very large JSON)
+ * @returns Parsed object or throws error
+ */
+export function safeParseJson(text: string, maxDepth: number = 20, maxSize: number = 1000000): any {
+  if (typeof text !== 'string') {
+    throw new Error('Input must be a string');
+  }
+&nbsp;
+  // Check size limit
+  if (text.length &gt; maxSize) {
+    throw new Error(`JSON input too large (${text.length} characters, max ${maxSize})`);
+  }
+&nbsp;
+  // Check for potentially dangerous patterns
+  const dangerousPatterns = [
+    /\bconstructor\b/i,
+    /\bprototype\b/i,
+    /\b__proto__\b/i,
+    /\bfunction\b/i,
+    /\brequire\b/i,
+    /\brequire\b/i,
+    /\bprocess\b/i,
+    /\bchild_process\b/i,
+    /\bglobal\b/i,
+    /\bwindow\b/i,
+    /\bdangerouslySetInnerHTML\b/i,
+  ];
+&nbsp;
+  for (const pattern of dangerousPatterns) {
+    if (pattern.test(text)) {
+      throw new Error('Potentially dangerous JSON pattern detected');
+    }
+  }
+&nbsp;
+  try {
+    const result = JSON.parse(text);
+&nbsp;
+    // Recursive depth check
+    function checkDepth(obj: any, depth: number): boolean {
+      if (depth &gt; maxDepth) {
+        return false;
+      }
+&nbsp;
+      <span class="missing-if-branch" title="if path not taken" >I</span>if (Array.isArray(obj)) {
+<span class="cstat-no" title="statement not covered" >        for (const item of obj) {</span>
+<span class="cstat-no" title="statement not covered" >          <span class="missing-if-branch" title="if path not taken" >I</span>if (!checkDepth(item, depth + 1)) {</span>
+<span class="cstat-no" title="statement not covered" >            return false;</span>
+          }
+        }
+      } else if (obj &amp;&amp; typeof obj === 'object') {
+        for (const key in obj) {
+          if (!checkDepth(obj[key], depth + 1)) {
+            return false;
+          }
+        }
+      }
+&nbsp;
+      return true;
+    }
+&nbsp;
+    if (!checkDepth(result, 0)) {
+      throw new Error(`JSON nesting too deep (max ${maxDepth} levels)`);
+    }
+&nbsp;
+    // Validate that the result is a safe object (not a function, etc.)
+    <span class="missing-if-branch" title="if path not taken" >I</span>if (typeof result === 'function' || result instanceof Function) {
+<span class="cstat-no" title="statement not covered" >      throw new Error('JSON parsing resulted in a function - potential code injection');</span>
+    }
+&nbsp;
+    return result;
+  } catch (error) {
+    // Re-throw JSON parse errors with additional context
+    if (error instanceof Error &amp;&amp; error.message.includes('JSON')) {
+      throw new Error(`Invalid JSON: ${error.message}`);
+    }
+<span class="cstat-no" title="statement not covered" >    throw new Error(</span>
+      `Failed to parse JSON: ${error instanceof Error ? error.message : 'Unknown error'}`
+    );
+  }
+}
+&nbsp;
 export function validatePath(path: string): { valid: boolean; error?: string } {
   const normalized = normalizePath(path);
 &nbsp;
@@ -226,7 +1189,7 @@ export function validatePath(path: string): { valid: boolean; error?: string } {
             <div class='footer quiet pad2 space-top1 center small'>
                 Code coverage generated by
                 <a href="https://istanbul.js.org/" target="_blank" rel="noopener noreferrer">istanbul</a>
-                at 2026-05-04T18:57:30.341Z
+                at 2026-05-04T22:31:13.164Z
             </div>
         <script src="prettify.js"></script>
         <script>
diff --git a/coverage/lcov-report/vault-indexer.ts.html b/coverage/lcov-report/vault-indexer.ts.html
index ebdf84a..e4b89c8 100644
--- a/coverage/lcov-report/vault-indexer.ts.html
+++ b/coverage/lcov-report/vault-indexer.ts.html
@@ -1261,7 +1261,7 @@ export class VaultIndexer {
             <div class='footer quiet pad2 space-top1 center small'>
                 Code coverage generated by
                 <a href="https://istanbul.js.org/" target="_blank" rel="noopener noreferrer">istanbul</a>
-                at 2026-05-04T19:35:37.813Z
+                at 2026-05-04T22:31:13.164Z
             </div>
         <script src="prettify.js"></script>
         <script>
diff --git a/coverage/lcov.info b/coverage/lcov.info
index 003a1d9..766bcc4 100644
--- a/coverage/lcov.info
+++ b/coverage/lcov.info
@@ -1,4 +1,497 @@
 TN:
+SF:src/error-handler.ts
+FN:18,(anonymous_0)
+FN:49,(anonymous_1)
+FN:109,(anonymous_2)
+FN:146,(anonymous_3)
+FN:150,(anonymous_4)
+FN:154,(anonymous_5)
+FN:163,(anonymous_6)
+FN:167,(anonymous_7)
+FN:171,(anonymous_8)
+FN:175,(anonymous_9)
+FNF:10
+FNH:10
+FNDA:4,(anonymous_0)
+FNDA:7,(anonymous_1)
+FNDA:8,(anonymous_2)
+FNDA:1,(anonymous_3)
+FNDA:1,(anonymous_4)
+FNDA:1,(anonymous_5)
+FNDA:1,(anonymous_6)
+FNDA:1,(anonymous_7)
+FNDA:1,(anonymous_8)
+FNDA:1,(anonymous_9)
+DA:1,1
+DA:2,1
+DA:13,1
+DA:19,4
+DA:20,4
+DA:22,4
+DA:23,1
+DA:24,1
+DA:25,3
+DA:26,2
+DA:27,2
+DA:29,1
+DA:30,1
+DA:33,4
+DA:34,4
+DA:38,4
+DA:41,4
+DA:42,3
+DA:50,7
+DA:52,2
+DA:53,2
+DA:55,0
+DA:58,0
+DA:59,0
+DA:61,0
+DA:64,2
+DA:65,2
+DA:66,2
+DA:67,1
+DA:69,1
+DA:71,0
+DA:74,1
+DA:75,1
+DA:77,0
+DA:80,1
+DA:81,1
+DA:83,0
+DA:86,1
+DA:87,1
+DA:89,0
+DA:92,0
+DA:95,0
+DA:110,8
+DA:112,8
+DA:113,2
+DA:116,6
+DA:121,1
+DA:124,5
+DA:125,1
+DA:128,4
+DA:129,1
+DA:132,3
+DA:133,1
+DA:136,2
+DA:137,1
+DA:140,1
+DA:147,1
+DA:151,1
+DA:159,1
+DA:160,1
+DA:164,1
+DA:168,1
+DA:172,1
+DA:176,1
+LF:64
+LH:54
+BRDA:22,0,0,1
+BRDA:22,0,1,3
+BRDA:25,1,0,2
+BRDA:25,1,1,1
+BRDA:33,2,0,4
+BRDA:39,3,0,0
+BRDA:39,3,1,4
+BRDA:39,4,0,3
+BRDA:39,4,1,1
+BRDA:41,5,0,3
+BRDA:50,6,0,2
+BRDA:50,6,1,0
+BRDA:50,6,2,2
+BRDA:50,6,3,1
+BRDA:50,6,4,1
+BRDA:50,6,5,1
+BRDA:50,6,6,0
+BRDA:50,6,7,0
+BRDA:52,7,0,2
+BRDA:58,8,0,0
+BRDA:64,9,0,2
+BRDA:66,10,0,1
+BRDA:67,11,0,1
+BRDA:67,11,1,0
+BRDA:74,12,0,1
+BRDA:80,13,0,1
+BRDA:81,14,0,1
+BRDA:81,14,1,0
+BRDA:86,15,0,1
+BRDA:95,16,0,0
+BRDA:95,16,1,0
+BRDA:112,17,0,2
+BRDA:116,18,0,1
+BRDA:117,19,0,6
+BRDA:117,19,1,5
+BRDA:117,19,2,5
+BRDA:124,20,0,1
+BRDA:124,21,0,5
+BRDA:124,21,1,4
+BRDA:128,22,0,1
+BRDA:128,23,0,4
+BRDA:128,23,1,3
+BRDA:132,24,0,1
+BRDA:132,25,0,3
+BRDA:132,25,1,2
+BRDA:136,26,0,1
+BRDA:136,27,0,2
+BRDA:136,27,1,1
+BRDA:159,28,0,1
+BRDA:159,28,1,0
+BRF:50
+BRH:40
+end_of_record
+TN:
+SF:src/tool-executor.ts
+FN:9,(anonymous_0)
+FN:14,(anonymous_1)
+FNF:2
+FNH:2
+FNDA:27,(anonymous_0)
+FNDA:27,(anonymous_1)
+DA:2,1
+DA:3,1
+DA:5,1
+DA:10,27
+DA:11,27
+DA:17,27
+DA:19,27
+DA:22,26
+DA:24,26
+DA:25,25
+DA:26,25
+DA:28,1
+DA:35,25
+DA:36,1
+DA:40,24
+DA:41,2
+DA:44,22
+DA:45,1
+DA:48,21
+DA:49,21
+DA:50,14
+DA:53,7
+DA:54,6
+DA:57,1
+LF:24
+LH:24
+BRDA:19,0,0,26
+BRDA:19,0,1,1
+BRDA:24,1,0,25
+BRDA:24,1,1,1
+BRDA:29,2,0,1
+BRDA:29,2,1,0
+BRDA:35,3,0,1
+BRDA:40,4,0,2
+BRDA:44,5,0,1
+BRDA:49,6,0,14
+BRDA:50,7,0,14
+BRDA:50,7,1,0
+BRF:12
+BRH:10
+end_of_record
+TN:
+SF:src/types.ts
+FN:7,(anonymous_0)
+FN:18,(anonymous_1)
+FN:29,(anonymous_2)
+FN:39,(anonymous_3)
+FN:49,(anonymous_4)
+FN:59,(anonymous_5)
+FN:69,(anonymous_6)
+FN:79,(anonymous_7)
+FNF:8
+FNH:8
+FNDA:2,(anonymous_0)
+FNDA:34,(anonymous_1)
+FNDA:4,(anonymous_2)
+FNDA:1,(anonymous_3)
+FNDA:3,(anonymous_4)
+FNDA:2,(anonymous_5)
+FNDA:7,(anonymous_6)
+FNDA:16,(anonymous_7)
+DA:7,2
+DA:8,2
+DA:9,2
+DA:10,2
+DA:11,2
+DA:12,2
+DA:13,2
+DA:14,2
+DA:17,2
+DA:20,34
+DA:21,34
+DA:23,34
+DA:24,34
+DA:28,2
+DA:31,4
+DA:33,4
+DA:34,4
+DA:38,2
+DA:41,1
+DA:43,1
+DA:44,1
+DA:48,2
+DA:51,3
+DA:53,3
+DA:54,3
+DA:58,2
+DA:61,2
+DA:63,2
+DA:64,2
+DA:68,2
+DA:71,7
+DA:73,7
+DA:74,7
+DA:78,2
+DA:81,16
+DA:83,16
+DA:84,16
+LF:37
+LH:37
+BRDA:7,0,0,2
+BRDA:7,0,1,2
+BRF:2
+BRH:2
+end_of_record
+TN:
+SF:src/utils.ts
+FN:6,(anonymous_0)
+FN:23,(anonymous_1)
+FN:31,(anonymous_2)
+FN:40,(anonymous_3)
+FN:51,(anonymous_4)
+FN:62,(anonymous_5)
+FN:73,(anonymous_6)
+FN:88,(anonymous_7)
+FN:116,(anonymous_8)
+FN:126,(anonymous_9)
+FN:141,validateOllamaUrl
+FN:173,validateModelName
+FN:209,validatePluginSettings
+FN:228,normalizePath
+FN:246,isValidHttpUrl
+FN:263,safeParseJson
+FN:298,checkDepth
+FN:341,validatePath
+FNF:18
+FNH:9
+FNDA:2,(anonymous_0)
+FNDA:0,(anonymous_1)
+FNDA:0,(anonymous_2)
+FNDA:0,(anonymous_3)
+FNDA:0,(anonymous_4)
+FNDA:0,(anonymous_5)
+FNDA:0,(anonymous_6)
+FNDA:0,(anonymous_7)
+FNDA:0,(anonymous_8)
+FNDA:0,(anonymous_9)
+FNDA:12,validateOllamaUrl
+FNDA:15,validateModelName
+FNDA:4,validatePluginSettings
+FNDA:21,normalizePath
+FNDA:16,isValidHttpUrl
+FNDA:36,safeParseJson
+FNDA:101,checkDepth
+FNDA:21,validatePath
+DA:6,2
+DA:7,2
+DA:8,2
+DA:9,2
+DA:10,2
+DA:16,2
+DA:17,2
+DA:24,0
+DA:32,0
+DA:41,0
+DA:42,0
+DA:52,0
+DA:53,0
+DA:63,0
+DA:64,0
+DA:74,0
+DA:75,0
+DA:76,0
+DA:77,0
+DA:89,0
+DA:90,0
+DA:91,0
+DA:92,0
+DA:94,0
+DA:96,0
+DA:97,0
+DA:99,0
+DA:100,0
+DA:102,0
+DA:103,0
+DA:105,0
+DA:106,0
+DA:117,0
+DA:127,0
+DA:141,2
+DA:142,12
+DA:143,2
+DA:147,10
+DA:148,10
+DA:149,0
+DA:153,10
+DA:154,3
+DA:161,7
+DA:162,1
+DA:165,6
+DA:173,2
+DA:174,15
+DA:175,2
+DA:178,13
+DA:179,13
+DA:180,0
+DA:184,13
+DA:185,13
+DA:186,3
+DA:193,10
+DA:194,1
+DA:197,9
+DA:198,1
+DA:201,8
+DA:209,2
+DA:210,4
+DA:212,4
+DA:213,4
+DA:214,4
+DA:215,2
+DA:219,4
+DA:220,4
+DA:221,4
+DA:222,2
+DA:226,4
+DA:228,2
+DA:230,21
+DA:233,21
+DA:234,0
+DA:237,21
+DA:246,2
+DA:248,16
+DA:249,16
+DA:251,5
+DA:253,11
+DA:263,2
+DA:264,36
+DA:265,1
+DA:269,35
+DA:270,1
+DA:274,34
+DA:288,34
+DA:289,340
+DA:290,4
+DA:294,30
+DA:295,30
+DA:299,101
+DA:300,1
+DA:303,100
+DA:304,0
+DA:305,0
+DA:306,0
+DA:309,100
+DA:310,48
+DA:311,73
+DA:312,21
+DA:317,79
+DA:320,28
+DA:321,1
+DA:325,27
+DA:326,0
+DA:329,27
+DA:332,3
+DA:333,3
+DA:335,0
+DA:341,2
+DA:342,21
+DA:345,21
+DA:346,21
+DA:347,2
+DA:351,19
+DA:352,2
+DA:356,17
+DA:357,1
+DA:361,16
+DA:362,16
+DA:363,8
+DA:367,8
+DA:368,8
+DA:369,1
+DA:372,7
+LF:126
+LH:91
+BRDA:6,0,0,2
+BRDA:6,0,1,2
+BRDA:41,1,0,0
+BRDA:52,2,0,0
+BRDA:63,3,0,0
+BRDA:74,4,0,0
+BRDA:76,5,0,0
+BRDA:77,6,0,0
+BRDA:77,6,1,0
+BRDA:91,7,0,0
+BRDA:91,7,1,0
+BRDA:94,8,0,0
+BRDA:94,8,1,0
+BRDA:94,8,2,0
+BRDA:94,8,3,0
+BRDA:142,9,0,2
+BRDA:142,10,0,12
+BRDA:142,10,1,11
+BRDA:148,11,0,0
+BRDA:153,12,0,3
+BRDA:161,13,0,1
+BRDA:174,14,0,2
+BRDA:174,15,0,15
+BRDA:174,15,1,14
+BRDA:179,16,0,0
+BRDA:185,17,0,3
+BRDA:193,18,0,1
+BRDA:197,19,0,1
+BRDA:212,20,0,4
+BRDA:214,21,0,2
+BRDA:219,22,0,4
+BRDA:221,23,0,2
+BRDA:233,24,0,0
+BRDA:233,25,0,21
+BRDA:233,25,1,21
+BRDA:253,26,0,11
+BRDA:253,26,1,4
+BRDA:263,27,0,36
+BRDA:263,28,0,36
+BRDA:264,29,0,1
+BRDA:269,30,0,1
+BRDA:289,31,0,4
+BRDA:299,32,0,1
+BRDA:303,33,0,0
+BRDA:303,33,1,100
+BRDA:305,34,0,0
+BRDA:309,35,0,48
+BRDA:309,36,0,100
+BRDA:309,36,1,98
+BRDA:311,37,0,21
+BRDA:320,38,0,1
+BRDA:325,39,0,0
+BRDA:325,40,0,27
+BRDA:325,40,1,27
+BRDA:332,41,0,3
+BRDA:332,42,0,3
+BRDA:332,42,1,3
+BRDA:336,43,0,0
+BRDA:336,43,1,0
+BRDA:346,44,0,2
+BRDA:351,45,0,2
+BRDA:351,46,0,19
+BRDA:351,46,1,17
+BRDA:356,47,0,1
+BRDA:362,48,0,8
+BRDA:368,49,0,1
+BRF:66
+BRH:45
+end_of_record
+TN:
 SF:src/vault-indexer.ts
 FN:31,(anonymous_0)
 FN:35,(anonymous_1)
diff --git a/main.ts b/main.ts
index e1abac7..682ecc8 100644
--- a/main.ts
+++ b/main.ts
@@ -1,6 +1,13 @@
 import { Plugin, WorkspaceLeaf, App, Setting, Notice, PluginSettingTab } from 'obsidian';
 import { ChatView } from './src/chat-view';
 import { PluginSettings } from './src/types';
+import {
+  isValidHttpUrl,
+  validatePluginSettings,
+  validateOllamaUrl,
+  validateModelName,
+  Logger,
+} from './src/utils';
 
 export default class OllamaPlugin extends Plugin {
   settings: PluginSettings = {
@@ -10,7 +17,11 @@ export default class OllamaPlugin extends Plugin {
   };
 
   async onload() {
+    // Initialize logging
+    Logger.info('Ollama Plugin loading...', 'plugin');
+
     await this.loadSettings();
+    Logger.info('Plugin loaded successfully', 'plugin');
 
     this.registerView(
       'ollama-chat-view',
@@ -30,11 +41,42 @@ export default class OllamaPlugin extends Plugin {
   }
 
   async loadSettings() {
-    this.settings = Object.assign({}, this.settings, await this.loadData());
+    try {
+      const data = await this.loadData();
+      if (data) {
+        Logger.debug('Loading saved settings', 'settings');
+        this.settings = Object.assign({}, this.settings, data);
+      }
+    } catch (error) {
+      // Use centralized error handling
+      const { ErrorHandler } = await import('./src/error-handler');
+      ErrorHandler.handleError(error, 'settings load');
+    }
   }
 
   async saveSettings() {
-    await this.saveData(this.settings);
+    try {
+      // Validate settings before saving
+      const validationErrors = validatePluginSettings(this.settings);
+      if (validationErrors.length > 0) {
+        Logger.error(
+          'Validation errors prevented saving settings: ' + validationErrors.join('; '),
+          'settings'
+        );
+        new Notice(`Cannot save settings: ${validationErrors[0]}`);
+        return false;
+      }
+
+      Logger.debug('Saving settings: ' + JSON.stringify(this.settings), 'settings');
+      await this.saveData(this.settings);
+      Logger.info('Settings saved successfully', 'settings');
+      return true;
+    } catch (error) {
+      // Use centralized error handling
+      const { ErrorHandler } = await import('./src/error-handler');
+      ErrorHandler.handleError(error, 'settings save');
+      return false;
+    }
   }
 }
 
@@ -55,8 +97,15 @@ class OllamaSettingTab extends PluginSettingTab {
       .setDesc('URL of your Ollama instance')
       .addText((text) =>
         text.setValue(this.plugin.settings.ollamaUrl).onChange(async (value) => {
-          this.plugin.settings.ollamaUrl = value;
-          await this.plugin.saveSettings();
+          const urlValidation = validateOllamaUrl(value);
+          if (urlValidation.valid) {
+            Logger.debug('URL changed to: ' + value, 'settings');
+            this.plugin.settings.ollamaUrl = value;
+            await this.plugin.saveSettings();
+          } else {
+            Logger.warn('Invalid URL format: ' + urlValidation.error, 'settings');
+            new Notice(urlValidation.error || 'Invalid Ollama URL format.');
+          }
         })
       );
 
@@ -65,8 +114,15 @@ class OllamaSettingTab extends PluginSettingTab {
       .setDesc('Model to use for chat')
       .addText((text) =>
         text.setValue(this.plugin.settings.model).onChange(async (value) => {
-          this.plugin.settings.model = value;
-          await this.plugin.saveSettings();
+          const modelValidation = validateModelName(value);
+          if (modelValidation.valid) {
+            Logger.debug('Model changed to: ' + value, 'settings');
+            this.plugin.settings.model = value;
+            await this.plugin.saveSettings();
+          } else {
+            Logger.warn('Invalid model name format: ' + modelValidation.error, 'settings');
+            new Notice(modelValidation.error || 'Invalid model name format.');
+          }
         })
       );
   }
diff --git a/src/ollama-client.ts b/src/ollama-client.ts
index fefd84f..6c42f8a 100644
--- a/src/ollama-client.ts
+++ b/src/ollama-client.ts
@@ -1,4 +1,5 @@
 import { OllamaMessage, OllamaTool, ToolCall } from './types';
+import { safeParseJson } from './utils';
 
 interface FetchResponse {
   ok: boolean;
@@ -33,20 +34,67 @@ export class OllamaClient {
     if (fetchFn) this.fetchFn = fetchFn;
   }
 
+  async chat(
+    messages: OllamaMessage[],
+    tools: OllamaTool[]
+  ): Promise<{ content: string; tool_calls?: ToolCall[] }> {
+    const self = this;
+    const startTime = Date.now();
+
+    // Create new abort controller for this request
+    self.abortController = new AbortController();
+
+    try {
+      const response = await this.fetchFn(`${this.url}/api/chat`, {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+        },
+        body: JSON.stringify({
+          model: this.model,
+          messages,
+          tools,
+          stream: false,
+        }),
+        signal: self.abortController.signal,
+      });
+
+      if (!response.ok) {
+        throw new Error(`Ollama API error: ${response.status}`);
+      }
+
+      const jsonResponse = await response.json();
+      if (!jsonResponse.message) {
+        throw new Error('Invalid response from Ollama API');
+      }
+
+      return {
+        content: jsonResponse.message.content || '',
+        tool_calls: Array.isArray(jsonResponse.message.tool_calls)
+          ? jsonResponse.message.tool_calls
+          : [],
+      };
+    } catch (error) {
+      self.abortController = null;
+      throw error;
+    } finally {
+      self.abortController = null;
+    }
+  }
+
   async streamChat(
     messages: OllamaMessage[],
-    tools: OllamaTool[],
-    timeoutMs: number = 60000
-  ): Promise<AsyncIterable<{ content: string; tool_calls?: ToolCall[] }>> {
-    this.abortController = new AbortController();
+    tools: OllamaTool[]
+  ): Promise<AsyncIterable<{ content: string; tool_calls?: ToolCall[]; done?: boolean }>> {
+    const self = this;
+    const maxChunks = 100;
+    let chunkCount = 0;
 
-    const timeoutId = setTimeout(() => {
-      this.abortController?.abort();
-    }, timeoutMs);
+    // Create new abort controller for this request
+    self.abortController = new AbortController();
 
-    let response: FetchResponse;
     try {
-      response = await this.fetchFn(`${this.url}/api/chat`, {
+      const response = await this.fetchFn(`${this.url}/api/chat`, {
         method: 'POST',
         headers: {
           'Content-Type': 'application/json',
@@ -57,145 +105,79 @@ export class OllamaClient {
           tools,
           stream: true,
         }),
-        signal: this.abortController.signal,
-      } as FetchOptions);
-    } catch (fetchError: any) {
-      clearTimeout(timeoutId);
-      this.abortController = null;
-      if (fetchError.name === 'AbortError' || fetchError.code === 'ABORT_ERR') {
-        throw new Error('Request timeout while connecting to Ollama');
+        signal: self.abortController.signal,
+      });
+
+      if (!response.ok) {
+        throw new Error(`Ollama API error: ${response.status}`);
       }
-      throw fetchError;
-    }
 
-    if (!response.ok) {
-      throw new Error(`Ollama API error: ${response.status}`);
-    }
+      if (!response.body) {
+        throw new Error('No response body');
+      }
 
-    if (!response.body) {
-      throw new Error('No response body');
-    }
+      const contentType = response.headers?.get('content-type');
+      if (contentType !== 'application/x-ndjson') {
+        throw new Error('Invalid response format');
+      }
 
-    // Validate response structure
-    const contentType = response.headers?.get('content-type');
-    if (!contentType?.match(/application\/(x-ndjson|json)/)) {
-      throw new Error('Invalid response format');
-    }
+      const reader = response.body.getReader();
+      const decoder = new TextDecoder();
+      let buffer = '';
 
-    const reader = response.body.getReader();
+      return {
+        async *[Symbol.asyncIterator]() {
+          try {
+            while (true) {
+              const { done, value } = await reader.read();
+              if (done) {
+                await reader.releaseLock();
+                return;
+              }
 
-    const self = this;
-    return {
-      [Symbol.asyncIterator]: async function* () {
-        const decoder = new TextDecoder();
-        let buffer = '';
-        let chunkCount = 0;
-        let skippedChunks = 0;
-        const maxChunks = 1000; // Safety limit
-        const maxSkipped = 50; // Fail if too many chunks are malformed
-        try {
-          while (true) {
-            const { done, value } = await reader.read();
-            if (done) break;
-            if (++chunkCount > maxChunks) {
-              throw new Error('Response too long, stopped streaming');
-            }
-            buffer += decoder.decode(value, { stream: true });
-            const lines = buffer.split('\n');
-            buffer = lines.pop() || '';
-            for (const line of lines) {
-              if (line.trim() === '') continue;
-              try {
-                const data = JSON.parse(line);
-                if (data.message && typeof data.message === 'object') {
-                  // Validate message structure
-                  if (data.message.error && typeof data.message.error === 'string') {
-                    throw new Error(`Ollama error: ${data.message.error}`);
+              if (++chunkCount > maxChunks) {
+                throw new Error('Response too long, stopped streaming');
+              }
+              buffer += decoder.decode(value, { stream: true });
+              const lines = buffer.split('\n');
+              buffer = lines.pop() || '';
+              for (const line of lines) {
+                if (line.trim() === '') continue;
+                try {
+                  const data = safeParseJson(line);
+                  if (data.message && typeof data.message === 'object') {
+                    // Validate message structure
+                    if (data.message.error && typeof data.message.error === 'string') {
+                      throw new Error(`Ollama error: ${data.message.error}`);
+                    }
+                    yield {
+                      content: data.message.content || '',
+                      tool_calls: Array.isArray(data.message.tool_calls)
+                        ? data.message.tool_calls
+                        : [],
+                    };
                   }
-                  yield {
-                    content: data.message.content || '',
-                    tool_calls: Array.isArray(data.message.tool_calls)
-                      ? data.message.tool_calls
-                      : [],
-                  };
+                } catch (error) {
+                  console.warn('Failed to parse Ollama stream chunk:', error);
+                  continue;
                 }
-              } catch (parseError) {
-                // Check if this is an Ollama error (thrown intentionally) vs a parse error
-                if (parseError instanceof Error && parseError.message.startsWith('Ollama error:')) {
-                  // This is an intentional Ollama error, re-throw it
-                  self.abortController = null;
-                  reader.releaseLock();
-                  throw parseError;
-                }
-
-                // This is a parse error, skip the malformed chunk
-                skippedChunks++;
-                console.warn(
-                  `[OllamaClient] Skipped malformed chunk ${skippedChunks}/${maxSkipped}:`,
-                  parseError instanceof Error ? parseError.message : String(parseError)
-                );
-                if (skippedChunks > maxSkipped) {
-                  throw new Error(
-                    `Too many malformed response chunks (${skippedChunks}). Connection may be degraded.`
-                  );
-                }
-                // Skip invalid chunks but continue streaming
-                continue;
               }
             }
+          } finally {
+            try {
+              await reader.releaseLock();
+            } catch (e) {
+              // Ignore release lock errors
+            }
           }
-        } catch (streamError) {
-          self.abortController = null;
-          if (streamError instanceof Error && streamError.name === 'AbortError') {
-            throw new Error('Streaming request was cancelled');
-          }
-          throw streamError;
-        } finally {
-          reader.releaseLock();
-          self.abortController = null;
-        }
-      },
-    };
-  }
-
-  async chat(
-    messages: OllamaMessage[],
-    tools: OllamaTool[],
-    timeoutMs: number = 30000
-  ): Promise<{ content: string; tool_calls?: ToolCall[] }> {
-    const abortController = new AbortController();
-    const timeoutId = setTimeout(() => {
-      abortController.abort();
-    }, timeoutMs);
-
-    const response = await this.fetchFn(`${this.url}/api/chat`, {
-      method: 'POST',
-      headers: {
-        'Content-Type': 'application/json',
-      },
-      body: JSON.stringify({
-        model: this.model,
-        messages,
-        tools,
-        stream: false,
-      }),
-      signal: abortController.signal,
-    } as FetchOptions);
-
-    clearTimeout(timeoutId);
-
-    if (!response.ok) {
-      throw new Error(`Ollama API error: ${response.status}`);
+        },
+      };
+    } catch (error) {
+      self.abortController = null;
+      throw error;
+    } finally {
+      self.abortController = null;
     }
-
-    const responseData = await response.json();
-
-    const data = responseData;
-    const messageData = data.message;
-    return {
-      content: messageData?.content || '',
-      tool_calls: messageData?.tool_calls || [],
-    };
   }
 
   cancelStream(): void {
diff --git a/src/tool-executor.ts b/src/tool-executor.ts
index 05a1ba3..1c7fb81 100644
--- a/src/tool-executor.ts
+++ b/src/tool-executor.ts
@@ -1,6 +1,6 @@
 import { Vault, TFile, Notice, App } from 'obsidian';
 import { ToolCall, ToolResult, ToolExecutionError, PathValidationError } from './types';
-import { validatePath } from './utils';
+import { validatePath, safeParseJson } from './utils';
 
 export class ToolExecutor {
   private vault: Vault;
@@ -21,7 +21,7 @@ export class ToolExecutor {
         let filePath: string, content: string;
         try {
           // Handle both string (JSON) and object arguments, since some Ollama versions return args as an object
-          const parsedArgs = typeof args === 'string' ? JSON.parse(args) : args;
+          const parsedArgs = typeof args === 'string' ? safeParseJson(args) : args;
           filePath = parsedArgs.path;
           content = parsedArgs.content;
         } catch (e) {
diff --git a/src/types.ts b/src/types.ts
index 52079e9..d55e646 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -132,3 +132,125 @@ export interface ChatMessage {
   isStreaming?: boolean;
   tool_calls?: ToolCall[];
 }
+
+/**
+ * API Response Types
+ */
+
+export interface OllamaChatResponse {
+  model: string;
+  created_at: string;
+  message: {
+    role: 'assistant';
+    content: string;
+    tool_calls?: ToolCall[];
+  };
+  done: boolean;
+  total_duration?: number;
+  load_duration?: number;
+  prompt_eval_count?: number;
+  eval_count?: number;
+}
+
+export interface OllamaStreamResponse {
+  model: string;
+  created_at: string;
+  message: {
+    role: 'assistant';
+    content: string;
+    tool_calls?: ToolCall[];
+  };
+  done: boolean;
+}
+
+export interface OllamaErrorResponse {
+  error: string;
+}
+
+export interface OllamaModelList {
+  models: Array<{
+    name: string;
+    id: string;
+    modified_at: string;
+    size: number;
+  }>;
+}
+
+export interface OllamaGenerateResponse {
+  model: string;
+  created_at: string;
+  response: string;
+  done: boolean;
+  context?: number[];
+  total_duration?: number;
+  load_duration?: number;
+  prompt_eval_count?: number;
+  eval_count?: number;
+}
+
+export interface OllamaPullStatus {
+  status: string;
+  digest: string;
+  total_size: number;
+  completed_size: number;
+}
+
+export interface OllamaEmbeddingResponse {
+  embeddings: number[];
+  model: string;
+  total_duration?: number;
+  load_duration?: number;
+  prompt_eval_count?: number;
+  eval_count?: number;
+}
+
+/**
+ * Client Configuration Types
+ */
+
+export interface OllamaClientConfig {
+  url: string;
+  model: string;
+  timeout?: number;
+  maxRetries?: number;
+}
+
+export interface OllamaRequestOptions {
+  timeout?: number;
+  signal?: AbortSignal;
+}
+
+/**
+ * Streaming Types
+ */
+
+export interface StreamChunk {
+  content: string;
+  tool_calls?: ToolCall[];
+  done?: boolean;
+  error?: string;
+}
+
+export interface StreamMetadata {
+  model: string;
+  created_at: string;
+  done: boolean;
+  total_duration?: number;
+  load_duration?: number;
+}
+
+export interface ChatSession {
+  id: string;
+  messages: OllamaMessage[];
+  createdAt: number;
+  model: string;
+}
+
+export interface ToolDefinition {
+  type: 'function';
+  function: {
+    name: string;
+    description: string;
+    parameters: Record<string, any>;
+  };
+}
diff --git a/src/utils.ts b/src/utils.ts
index 983d576..59562b7 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,7 +1,230 @@
+/**
+ * Logging utility for consistent log formatting and levels
+ * Provides standardized logging across the plugin
+ */
+
+export enum LogLevel {
+  DEBUG = 'debug',
+  INFO = 'info',
+  WARN = 'warn',
+  ERROR = 'error',
+}
+
+/**
+ * Centralized logging utility with consistent formatting
+ */
+export class Logger {
+  private static currentLevel: LogLevel = LogLevel.INFO;
+
+  /**
+   * Set the current log level
+   * @param level The minimum log level to output
+   */
+  static setLevel(level: LogLevel): void {
+    this.currentLevel = level;
+  }
+
+  /**
+   * Get the current log level
+   * @returns The current log level
+   */
+  static getLevel(): LogLevel {
+    return this.currentLevel;
+  }
+
+  /**
+   * Log a debug message
+   * @param message The message to log
+   * @param context Additional context (e.g., component name)
+   */
+  static debug(message: string, context?: string): void {
+    if (this.currentLevel <= LogLevel.DEBUG) {
+      this.log(LogLevel.DEBUG, message, context);
+    }
+  }
+
+  /**
+   * Log an info message
+   * @param message The message to log
+   * @param context Additional context (e.g., component name)
+   */
+  static info(message: string, context?: string): void {
+    if (this.currentLevel <= LogLevel.INFO) {
+      this.log(LogLevel.INFO, message, context);
+    }
+  }
+
+  /**
+   * Log a warning message
+   * @param message The message to log
+   * @param context Additional context (e.g., component name)
+   */
+  static warn(message: string, context?: string): void {
+    if (this.currentLevel <= LogLevel.WARN) {
+      this.log(LogLevel.WARN, message, context);
+    }
+  }
+
+  /**
+   * Log an error message
+   * @param message The message to log
+   * @param context Additional context (e.g., component name)
+   */
+  static error(message: string, context?: string, error?: unknown): void {
+    if (this.currentLevel <= LogLevel.ERROR) {
+      this.log(LogLevel.ERROR, message, context);
+      if (error) {
+        console.error('[Error Details]', error instanceof Error ? error.stack : error);
+      }
+    }
+  }
+
+  /**
+   * Internal log method with consistent formatting
+   * @param level The log level
+   * @param message The message to log
+   * @param context Additional context
+   */
+  private static log(level: LogLevel, message: string, context?: string): void {
+    const timestamp = new Date().toISOString();
+    const levelStr = level.toUpperCase();
+    const contextStr = context ? `[${context}]` : '';
+    const formattedMessage = `[${timestamp}] ${levelStr} ${contextStr} ${message}`;
+
+    switch (level) {
+      case LogLevel.DEBUG:
+        console.debug(formattedMessage);
+        break;
+      case LogLevel.INFO:
+        console.info(formattedMessage);
+        break;
+      case LogLevel.WARN:
+        console.warn(formattedMessage);
+        break;
+      case LogLevel.ERROR:
+        console.error(formattedMessage);
+        break;
+    }
+  }
+
+  /**
+   * Log a performance measurement
+   * @param operation The operation being measured
+   * @param durationMs The duration in milliseconds
+   * @param context Additional context
+   */
+  static perf(operation: string, durationMs: number, context?: string): void {
+    this.info(`Performance: ${operation} took ${durationMs.toFixed(2)}ms`, context);
+  }
+
+  /**
+   * Log a deprecated feature usage
+   * @param feature The deprecated feature being used
+   * @param replacement The replacement feature
+   * @param context Additional context
+   */
+  static deprecated(feature: string, replacement: string, context?: string): void {
+    this.warn(`Deprecated: ${feature} is deprecated. Use ${replacement} instead.`, context);
+  }
+}
+
 /**
  * Normalizes file paths for browser/ Obsidian environment
  * Replaces multiple slashes with single slash and handles forward/backward slashes
  */
+
+/**
+ * Validates the Ollama URL configuration
+ * @param url The URL to validate
+ * @returns Object with validation result and error message if invalid
+ */
+export function validateOllamaUrl(url: string): { valid: boolean; error?: string } {
+  if (!url || typeof url !== 'string') {
+    return { valid: false, error: 'Ollama URL cannot be empty' };
+  }
+
+  // Trim whitespace
+  const trimmedUrl = url.trim();
+  if (trimmedUrl.length === 0) {
+    return { valid: false, error: 'Ollama URL cannot be empty' };
+  }
+
+  // Validate URL format
+  if (!isValidHttpUrl(trimmedUrl)) {
+    return {
+      valid: false,
+      error: 'Ollama URL must be a valid HTTP or HTTPS URL (e.g., http://localhost:11434)',
+    };
+  }
+
+  // Check for common mistakes
+  if (trimmedUrl.endsWith('/')) {
+    return { valid: false, error: 'Ollama URL should not end with a slash' };
+  }
+
+  return { valid: true };
+}
+
+/**
+ * Validates the Ollama model name configuration
+ * @param modelName The model name to validate
+ * @returns Object with validation result and error message if invalid
+ */
+export function validateModelName(modelName: string): { valid: boolean; error?: string } {
+  if (!modelName || typeof modelName !== 'string') {
+    return { valid: false, error: 'Model name cannot be empty' };
+  }
+
+  const trimmedModel = modelName.trim();
+  if (trimmedModel.length === 0) {
+    return { valid: false, error: 'Model name cannot be empty' };
+  }
+
+  // Model names should be alphanumeric with optional dots, dashes, and underscores
+  const modelNameRegex = /^[a-zA-Z0-9._-]+$/;
+  if (!modelNameRegex.test(trimmedModel)) {
+    return {
+      valid: false,
+      error: 'Model name can only contain letters, numbers, dots, dashes, and underscores',
+    };
+  }
+
+  // Check length constraints
+  if (trimmedModel.length < 2) {
+    return { valid: false, error: 'Model name must be at least 2 characters long' };
+  }
+
+  if (trimmedModel.length > 100) {
+    return { valid: false, error: 'Model name must be less than 100 characters long' };
+  }
+
+  return { valid: true };
+}
+
+/**
+ * Validates plugin settings before saving
+ * @param settings The settings to validate
+ * @returns Array of validation errors, empty if all valid
+ */
+export function validatePluginSettings(settings: any): string[] {
+  const errors: string[] = [];
+
+  if (settings.ollamaUrl) {
+    const urlValidation = validateOllamaUrl(settings.ollamaUrl);
+    if (!urlValidation.valid) {
+      errors.push(`Ollama URL: ${urlValidation.error}`);
+    }
+  }
+
+  if (settings.model) {
+    const modelValidation = validateModelName(settings.model);
+    if (!modelValidation.valid) {
+      errors.push(`Model: ${modelValidation.error}`);
+    }
+  }
+
+  return errors;
+}
 export function normalizePath(path: string): string {
   // Replace multiple slashes with single slash
   let normalized = path.replace(/[\\\/]+/g, '/');
@@ -17,6 +240,104 @@ export function normalizePath(path: string): string {
 /**
  * Validates a path string for safety (no traversal, no absolute paths, no invalid chars)
  */
+/**
+ * Validates a URL string to ensure it's a proper HTTP or HTTPS URL
+ */
+export function isValidHttpUrl(string: string): boolean {
+  let url;
+  try {
+    url = new URL(string);
+  } catch (_) {
+    return false;
+  }
+  return url.protocol === 'http:' || url.protocol === 'https:';
+}
+
+/**
+ * Safely parses JSON with validation to prevent code injection
+ * @param text The JSON string to parse
+ * @param maxDepth Maximum allowed nesting depth (prevents DoS via deeply nested JSON)
+ * @param maxSize Maximum allowed size in characters (prevents DoS via very large JSON)
+ * @returns Parsed object or throws error
+ */
+export function safeParseJson(text: string, maxDepth: number = 20, maxSize: number = 1000000): any {
+  if (typeof text !== 'string') {
+    throw new Error('Input must be a string');
+  }
+
+  // Check size limit
+  if (text.length > maxSize) {
+    throw new Error(`JSON input too large (${text.length} characters, max ${maxSize})`);
+  }
+
+  // Check for potentially dangerous patterns
+  const dangerousPatterns = [
+    /\bconstructor\b/i,
+    /\bprototype\b/i,
+    /\b__proto__\b/i,
+    /\bfunction\b/i,
+    /\brequire\b/i,
+    /\brequire\b/i,
+    /\bprocess\b/i,
+    /\bchild_process\b/i,
+    /\bglobal\b/i,
+    /\bwindow\b/i,
+    /\bdangerouslySetInnerHTML\b/i,
+  ];
+
+  for (const pattern of dangerousPatterns) {
+    if (pattern.test(text)) {
+      throw new Error('Potentially dangerous JSON pattern detected');
+    }
+  }
+
+  try {
+    const result = JSON.parse(text);
+
+    // Recursive depth check
+    function checkDepth(obj: any, depth: number): boolean {
+      if (depth > maxDepth) {
+        return false;
+      }
+
+      if (Array.isArray(obj)) {
+        for (const item of obj) {
+          if (!checkDepth(item, depth + 1)) {
+            return false;
+          }
+        }
+      } else if (obj && typeof obj === 'object') {
+        for (const key in obj) {
+          if (!checkDepth(obj[key], depth + 1)) {
+            return false;
+          }
+        }
+      }
+
+      return true;
+    }
+
+    if (!checkDepth(result, 0)) {
+      throw new Error(`JSON nesting too deep (max ${maxDepth} levels)`);
+    }
+
+    // Validate that the result is a safe object (not a function, etc.)
+    if (typeof result === 'function' || result instanceof Function) {
+      throw new Error('JSON parsing resulted in a function - potential code injection');
+    }
+
+    return result;
+  } catch (error) {
+    // Re-throw JSON parse errors with additional context
+    if (error instanceof Error && error.message.includes('JSON')) {
+      throw new Error(`Invalid JSON: ${error.message}`);
+    }
+    throw new Error(
+      `Failed to parse JSON: ${error instanceof Error ? error.message : 'Unknown error'}`
+    );
+  }
+}
+
 export function validatePath(path: string): { valid: boolean; error?: string } {
   const normalized = normalizePath(path);
 
diff --git a/tests/utils.test.ts b/tests/utils.test.ts
new file mode 100644
index 0000000..630732a
--- /dev/null
+++ b/tests/utils.test.ts
@@ -0,0 +1,197 @@
+/**
+ * Unit tests for utility functions, particularly validation functions
+ */
+import {
+  validateOllamaUrl,
+  validateModelName,
+  validatePluginSettings,
+  safeParseJson,
+  isValidHttpUrl,
+} from '../src/utils';
+
+describe('Validation Functions', () => {
+  describe('validateOllamaUrl', () => {
+    it('should accept valid HTTP URLs', () => {
+      expect(validateOllamaUrl('http://localhost:11434').valid).toBe(true);
+      expect(validateOllamaUrl('https://ollama.example.com').valid).toBe(true);
+      expect(validateOllamaUrl('http://192.168.1.100:8080').valid).toBe(true);
+    });
+
+    it('should reject invalid URLs', () => {
+      const invalidUrl = validateOllamaUrl('not-a-url');
+      expect(invalidUrl.valid).toBe(false);
+      expect(invalidUrl.error).toContain('valid HTTP or HTTPS URL');
+    });
+
+    it('should reject URLs ending with slash', () => {
+      const urlWithSlash = validateOllamaUrl('http://localhost:11434/');
+      expect(urlWithSlash.valid).toBe(false);
+      expect(urlWithSlash.error).toContain('should not end with a slash');
+    });
+
+    it('should reject empty URLs', () => {
+      const emptyUrl = validateOllamaUrl('');
+      expect(emptyUrl.valid).toBe(false);
+      expect(emptyUrl.error).toContain('cannot be empty');
+    });
+
+    it('should reject non-string inputs', () => {
+      const nonString = validateOllamaUrl(123 as any);
+      expect(nonString.valid).toBe(false);
+    });
+
+    it('should trim whitespace from URLs', () => {
+      expect(validateOllamaUrl('  http://localhost:11434  ').valid).toBe(true);
+    });
+  });
+
+  describe('validateModelName', () => {
+    it('should accept valid model names', () => {
+      expect(validateModelName('llama3').valid).toBe(true);
+      expect(validateModelName('llama-2').valid).toBe(true);
+      expect(validateModelName('llama.2').valid).toBe(true);
+      expect(validateModelName('llama_2').valid).toBe(true);
+      expect(validateModelName('llama-2-7b-instruct').valid).toBe(true);
+    });
+
+    it('should reject invalid model names', () => {
+      const invalidModel = validateModelName('llama@2');
+      expect(invalidModel.valid).toBe(false);
+      expect(invalidModel.error).toContain(
+        'only contain letters, numbers, dots, dashes, and underscores'
+      );
+    });
+
+    it('should reject empty model names', () => {
+      const emptyModel = validateModelName('');
+      expect(emptyModel.valid).toBe(false);
+      expect(emptyModel.error).toContain('cannot be empty');
+    });
+
+    it('should reject model names that are too short', () => {
+      const shortModel = validateModelName('a');
+      expect(shortModel.valid).toBe(false);
+      expect(shortModel.error).toContain('at least 2 characters long');
+    });
+
+    it('should reject model names that are too long', () => {
+      const longModel = validateModelName('a'.repeat(101));
+      expect(longModel.valid).toBe(false);
+      expect(longModel.error).toContain('less than 100 characters long');
+    });
+
+    it('should reject non-string inputs', () => {
+      const nonString = validateModelName(123 as any);
+      expect(nonString.valid).toBe(false);
+    });
+
+    it('should trim whitespace from model names', () => {
+      expect(validateModelName('  llama3  ').valid).toBe(true);
+    });
+  });
+
+  describe('validatePluginSettings', () => {
+    it('should return empty array for valid settings', () => {
+      const errors = validatePluginSettings({
+        ollamaUrl: 'http://localhost:11434',
+        model: 'llama3',
+        lastIndexTime: 0,
+      });
+      expect(errors).toEqual([]);
+    });
+
+    it('should report URL validation errors', () => {
+      const errors = validatePluginSettings({
+        ollamaUrl: 'invalid-url',
+        model: 'llama3',
+        lastIndexTime: 0,
+      });
+      expect(errors.length).toBe(1);
+      expect(errors[0]).toContain('Ollama URL');
+    });
+
+    it('should report model validation errors', () => {
+      const errors = validatePluginSettings({
+        ollamaUrl: 'http://localhost:11434',
+        model: 'invalid@model',
+        lastIndexTime: 0,
+      });
+      expect(errors.length).toBe(1);
+      expect(errors[0]).toContain('Model');
+    });
+
+    it('should report multiple validation errors', () => {
+      const errors = validatePluginSettings({
+        ollamaUrl: 'invalid-url',
+        model: 'invalid@model',
+        lastIndexTime: 0,
+      });
+      expect(errors.length).toBe(2);
+      expect(errors[0]).toContain('Ollama URL');
+      expect(errors[1]).toContain('Model');
+    });
+  });
+
+  describe('safeParseJson', () => {
+    it('should parse valid JSON', () => {
+      const result = safeParseJson('{"key": "value"}');
+      expect(result).toEqual({ key: 'value' });
+    });
+
+    it('should throw on invalid JSON', () => {
+      expect(() => safeParseJson('{invalid json}')).toThrow('Invalid JSON');
+    });
+
+    it('should throw on code injection patterns', () => {
+      expect(() => safeParseJson('{"constructor": "function(){}"}')).toThrow('dangerous');
+      expect(() => safeParseJson('{"prototype": "something"}')).toThrow('dangerous');
+      expect(() => safeParseJson('{"__proto__": "something"}')).toThrow('dangerous');
+      expect(() => safeParseJson('{"function": "alert"}')).toThrow('dangerous');
+    });
+
+    it('should throw on deeply nested JSON', () => {
+      const deeplyNested = JSON.stringify({ value: 1 });
+      let current = deeplyNested;
+      for (let i = 0; i < 25; i++) {
+        current = `{ "nested": ${current} }`;
+      }
+      expect(() => safeParseJson(current)).toThrow('nesting too deep');
+    });
+
+    it('should throw on very large JSON', () => {
+      const largeJson = '"' + 'x'.repeat(1000001) + '"'; // 1,000,001 characters
+      expect(() => safeParseJson(largeJson)).toThrow('input too large');
+    });
+
+    it('should handle string vs object arguments correctly', () => {
+      const stringArgs = '{"path": "test.md", "content": "test"}';
+      const objectArgs = { path: 'test.md', content: 'test' };
+
+      const stringResult = safeParseJson(stringArgs);
+      const objectResult = safeParseJson(JSON.stringify(objectArgs));
+
+      expect(stringResult).toEqual(objectResult);
+    });
+
+    it('should throw on non-string input', () => {
+      expect(() => safeParseJson(123 as any)).toThrow('Input must be a string');
+    });
+  });
+
+  describe('isValidHttpUrl', () => {
+    it('should accept valid HTTP URLs', () => {
+      expect(isValidHttpUrl('http://localhost:11434')).toBe(true);
+      expect(isValidHttpUrl('https://example.com')).toBe(true);
+    });
+
+    it('should reject non-HTTP URLs', () => {
+      expect(isValidHttpUrl('ftp://example.com')).toBe(false);
+      expect(isValidHttpUrl('file:///path')).toBe(false);
+    });
+
+    it('should reject invalid URLs', () => {
+      expect(isValidHttpUrl('not-a-url')).toBe(false);
+      expect(isValidHttpUrl('')).toBe(false);
+    });
+  });
+});
diff --git a/tsconfig.json b/tsconfig.json
index 86944cd..e7f1ba6 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -10,11 +10,9 @@
     "esModuleInterop": true,
     "skipLibCheck": true,
     "forceConsistentCasingInFileNames": true,
-    "lib": ["ESNext"],
     "moduleResolution": "node",
-    "types": ["node", "jest"]
   },
   "include": ["src/**/*", "main.ts"],
   "typeRoots": ["node_modules/@types", "./src"],
-  "exclude": ["node_modules"]
+  "exclude": ["node_modules"],
 }