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Refactor api2ai into modular architecture for mcp-use 2.x - #76
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…use 2.x
The 1,000-line generate-mcp-use-server.js is now spec/ (load, OpenAPI → Zod,
risk, tool extraction), templates/ (one module per generated file),
generate.js, cli.js and index.js. The old path remains as a re-exporting shim.
Generated servers now target mcp-use ^2.7.3 + zod 4: `import { MCPServer }
from 'mcp-use'`, `inputSchema`, MCP tool annotations, awaited listen(), raw
tool results with isError/structuredContent, and `mcp-use dev` for the
Inspector. dotenv is replaced by `node --env-file-if-exists`.
Fixes along the way:
- descriptions/enums with quotes, newlines or backslashes broke the output
- base URL path was dropped (`/api/v3` + `/pet` → `/pet`)
- relative and templated `servers[].url` are resolved
- local $ref schemas/parameters/bodies, allOf, 3.0/3.1 nullable
- --approve-writes was parsed but never applied
- duplicate tool names and duplicate path/operation params
- host allowlist now defaults to the spec's API host, as documented
- response size cap is enforced while streaming, in bytes
- regenerating no longer overwrites an existing .env
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RDDWQMAX1u1DQcFHrE5hFY
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Summary
Refactored the monolithic
generate-mcp-use-server.jsinto a modular architecture with separate concerns for spec loading, schema conversion, tool extraction, code generation, and CLI handling. Updated generated servers to target mcp-use 2.x API with zod 4 support.Key Changes
Modularized codebase: Split 1000+ line single file into focused modules:
spec/load-spec.js— fetch and parse OpenAPI specs (JSON/YAML)spec/schema-to-zod.js— convert OpenAPI schemas to Zod source code with proper escapingspec/extract-tools.js— extract operations into tool descriptionsspec/classify-risk.js— categorize tools by risk level with MCP annotationstemplates/*— one module per generated file (package.json, .env, policy, http-client, etc.)cli.js— command-line argument parsing and entry pointgenerate.js— orchestrate spec loading and file renderingindex.js— library exportsmcp-use 2.x compatibility:
MCPServerclass andinputSchema(notschema)readOnlyHint,destructiveHint,idempotentHintderived from HTTP methodlisten()instead of synchronous server setupz.iso.datetime(),z.email(),z.uuid()formattersImproved schema handling:
literal()function — prevents injection of newlines, backslashes,*/into generated code$refresolution with cycle detection (cycles becomez.unknown())allOfmerging for plain object schemasnullable: true) and 3.1 (type: ['string', 'null']) nullability supportEnhanced HTTP client:
/api/v3)Better documentation:
Test coverage: Added comprehensive test suite (
packages/grab-url/test/api2ai.test.ts) covering schema conversion, tool extraction, CLI parsing, and generated file validityImplementation Details
JSON.stringify()before splicing into generated sourcegenerate-mcp-use-server.jsre-exports from new moduleshttps://claude.ai/code/session_01RDDWQMAX1u1DQcFHrE5hFY