Three well-named, read-only tools with strong descriptions (194 - 250 chars each) and complete input schemas using Zod. All parameters are typed and described. However, output schemas are not formally documented, responses are text-only with no structured field definitions. Error handling is present but generic ('Could not resolve', 'Could not read'). Tool names follow verb_noun pattern (package_api, package_types, list_type_files) and are action-oriented. No security concerns (read-only, no secrets). Composition is clean, each tool has one responsibility. Missing: explicit output schema documentation, actionable error recovery guidance, and per-parameter constraints (e.g., version format, entry path pattern).

• Document output schemas explicitly. Define the structure of package_api responses (e.g., { exports: [{ kind: string, name: string, signature: string }], truncated: boolean }) and package_types responses (e.g., { package: string, version: string, file: string, content: string, truncated: boolean }).
• Enhance error messages with recovery guidance. E.g., 'Could not resolve [email protected]: version not found. Try version="latest" or check npm.js.org/package/zod for available versions.' Include actionable next steps.
• Add parameter constraints. Declare version as an enum or pattern (e.g., /^(latest|next|\d+\.\d+\.\d+)$/) and document entry path format (e.g., 'relative path within package, e.g., dist/index.d.ts').
• Implement pagination for list_type_files. Cap results at 100 files per response and return a total_count. If a package has >100 .d.ts files, offer a filter parameter (e.g., glob pattern) to narrow results.
• Return structured summaries from package_api instead of truncating text. Return { exports: [...], total: number, truncated: boolean, suggestion: 'Call package_types(file="...") for full signatures' } so the LLM can reason about what to fetch next without wasting tokens on truncation hints.