Single tool with complete input schema and clear naming. Tool name 'generate_client' follows verb_noun convention and is unambiguous. Input schema is well-formed with 3 required parameters, all typed and described. However, output schema is not documented, LLMs cannot predict the response structure. Error handling returns text responses but lacks actionable recovery guidance. No parameter constraints beyond enum for httpClient. Tool description is adequate (89 chars) but could better explain when to use it vs alternatives or what prerequisites exist.

• Document the output schema explicitly. Specify that success returns {content: [{type: 'text', text: string}]} with file list, and errors return {content: [...], isError: true}. Include example response.
• Enhance error messages with recovery guidance. Instead of 'Error generating client: <message>', return 'Invalid OpenAPI spec at <path>. Ensure it is valid JSON/YAML. Try validating with https://editor.swagger.io first.'
• Add format constraints to 'input' parameter: 'URL (http/https) or absolute file path to OpenAPI spec (JSON or YAML). Example: /path/to/openapi.json or https://api.example.com/openapi.yaml'
• Clarify 'output' parameter behavior: 'Output directory (created if missing). If directory exists, generated files will overwrite existing ones. Requires write permissions.'
• Update tool description to state side effects: 'Generate TypeScript API client from OpenAPI specification. Creates files in the output directory. This operation modifies filesystem state.'