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TypeScript Definitions MCP Server

by blakeyoder

reinitialize_indexer

Refresh TypeScript type definitions after installing packages to ensure accurate interface discovery and type-safe mock generation.

Instructions

Reinitialize the type indexer (useful after package installations)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
workingDirNoOptional working directory to reinitialize from

Implementation Reference

  • The handler function that executes the reinitialize_indexer tool logic. It optionally updates the working directory and config, then calls the typeIndexer.initialize() method, returning a success message.
    private async handleReinitializeIndexer(workingDir?: string) {
      try {
        if (workingDir) {
          this.config = WorkspaceDetector.detectProjectConfig(workingDir);
          this.typeIndexer = new TypeIndexer(this.config);
        }
        
        await this.typeIndexer.initialize();
        
        return {
          content: [
            {
              type: "text",
              text: JSON.stringify({
                message: "Type indexer reinitialized successfully",
                config: this.config
              }, null, 2)
            }
          ]
        };
      } catch (error) {
        throw new Error(`Failed to reinitialize indexer: ${error instanceof Error ? error.message : String(error)}`);
      }
    }
  • Registration of the reinitialize_indexer tool in the ListTools response, including name, description, and input schema definition.
    {
      name: "reinitialize_indexer",
      description: "Reinitialize the type indexer (useful after package installations)",
      inputSchema: {
        type: "object",
        properties: {
          workingDir: {
            type: "string",
            description: "Optional working directory to reinitialize from"
          }
        },
        additionalProperties: false
      }
    }
  • The switch case in CallToolRequest handler that routes the reinitialize_indexer tool call to the handleReinitializeIndexer method after argument validation.
    case "reinitialize_indexer": {
      const reinitArgs = this.validateArgs<ToolArguments["reinitialize_indexer"]>(args);
      return await this.handleReinitializeIndexer(reinitArgs.workingDir);
    }
  • TypeScript interface definition for the tool arguments used in validateArgs for type safety.
    reinitialize_indexer: { workingDir?: string };
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full burden. It mentions the tool is 'useful after package installations,' which hints at a specific scenario, but lacks critical behavioral details: whether it's destructive (e.g., clears existing index data), requires permissions, has side effects (e.g., temporary downtime), or what the expected outcome is (e.g., success/failure indicators). For a tool with no annotations, this is a significant gap.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence that states the purpose and provides a use case without any fluff. It's front-loaded with the main action and resource, making it easy to parse. Every word earns its place, and there's no wasted text.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's complexity (likely a system operation with potential side effects), no annotations, and no output schema, the description is incomplete. It fails to explain what 'reinitialize' entails behaviorally (e.g., does it rebuild from scratch, clear caches?), what happens on success or error, or any prerequisites. For a tool with no structured safety or output info, the description should do more to guide safe usage.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema has 100% description coverage, with one optional parameter 'workingDir' clearly documented. The description doesn't add any parameter details beyond the schema, but with high coverage and only one parameter, the baseline is strong. Since there are no parameters to compensate for, a score of 4 reflects that the schema alone is sufficient, and the description doesn't detract from it.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('reinitialize') and target ('the type indexer'), and provides a specific use case ('after package installations'). It distinguishes from siblings like 'check_type_compatibility' or 'get_package_types' by focusing on resetting/refreshing the indexer rather than querying or validating types. However, it doesn't explicitly contrast with all siblings, so it's not a perfect 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies when to use it ('after package installations'), which gives some context. However, it doesn't provide explicit alternatives (e.g., when to use this vs. other tools like 'get_package_types'), nor does it specify when not to use it (e.g., during active development without package changes). The guidance is helpful but incomplete.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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