feat: add MAX_TOTAL_THOUGHTS environment variable to sequential-thinking server

Adds support for constraining the totalThoughts parameter via the MAX_TOTAL_THOUGHTS environment variable:
- When set to a positive integer, caps totalThoughts at the specified limit
- Displays warning when capping occurs
- Maintains backward compatibility (unlimited by default)
- Updated README with configuration documentation

Fixes #2226

Co-authored-by: Ola Hungerford <olaservo@users.noreply.github.com>

src/sequentialthinking/README.md

@@ -77,8 +77,10 @@ Add this to your `claude_desktop_config.json`:
 }
 ```
 
-To disable logging of thought information set env var: `DISABLE_THOUGHT_LOGGING` to `true`.
-Comment
+### Environment Variables
+
+- `DISABLE_THOUGHT_LOGGING`: Set to `true` to disable logging of thought information
+- `MAX_TOTAL_THOUGHTS`: Set to a positive integer to limit the maximum number of thoughts allowed (e.g., `MAX_TOTAL_THOUGHTS=50`). When the AI model requests more thoughts than this limit, the value will be capped at the maximum with a warning message. Leave unset or set to 0 for unlimited thoughts (default behavior).
 
 ### Usage with VS Code
 

src/sequentialthinking/index.ts

@@ -26,9 +26,12 @@ class SequentialThinkingServer {
   private thoughtHistory: ThoughtData[] = [];
   private branches: Record<string, ThoughtData[]> = {};
   private disableThoughtLogging: boolean;
+  private maxTotalThoughts?: number;
 
   constructor() {
     this.disableThoughtLogging = (process.env.DISABLE_THOUGHT_LOGGING || "").toLowerCase() === "true";
+    const maxThoughts = parseInt(process.env.MAX_TOTAL_THOUGHTS || "0") || 0;
+    this.maxTotalThoughts = maxThoughts > 0 ? maxThoughts : undefined;
   }
 
   private validateThoughtData(input: unknown): ThoughtData {
@@ -92,6 +95,12 @@ class SequentialThinkingServer {
     try {
       const validatedInput = this.validateThoughtData(input);
 
+      // Apply maximum total thoughts limit if configured
+      if (this.maxTotalThoughts && validatedInput.totalThoughts > this.maxTotalThoughts) {
+        console.error(`Warning: totalThoughts capped at ${this.maxTotalThoughts} (requested: ${validatedInput.totalThoughts})`);
+        validatedInput.totalThoughts = this.maxTotalThoughts;
+      }
+
       if (validatedInput.thoughtNumber > validatedInput.totalThoughts) {
         validatedInput.totalThoughts = validatedInput.thoughtNumber;
       }