openapi
Archived TypeScript library that converts Swagger/OpenAPI (v2.0, v3.0, v3.1) documents into type-safe schemas suitable for LLM function calling. It normalizes specs through an “emended” OpenAPI v3.1 intermediate format, and includes runtime validation (via typia integration) to validate/repair LLM-generated arguments. It also references MCP-related integration and adapters for common LLM tooling ecosystems.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
TLS enforcement is not explicitly specified in provided content; examples use http://localhost for development. Auth strength is mainly dependent on your integration with external LLM providers and your backend; the library itself doesn’t describe access controls. Validation of model-generated arguments can reduce injection/type confusion risks, but you should still treat all LLM/tool inputs as untrusted and apply server-side authorization and input sanitization.
⚡ Reliability
Best When
You already have an OpenAPI spec and want strongly typed, validated LLM function-calling schemas, and you are able to migrate to the maintained typia equivalents.
Avoid When
You need long-term maintenance/support from this specific package, or you require guaranteed, documented runtime error semantics for HTTP execution beyond what’s shown in the archived docs.
Use Cases
- • Convert an existing REST API described by OpenAPI/Swagger into LLM tool/function-callable schemas.
- • Generate provider-agnostic function/tool parameter schemas for multiple LLMs (OpenAI/Claude/etc.).
- • Add runtime validation of model-generated JSON arguments before executing backend HTTP calls.
- • Normalize and transform between OpenAPI versions (including to an “emended” v3.1 format).
Not For
- • Acting as an HTTP server/API gateway for your backend (it’s a schema/conversion + client-side execution helper, not an API hosting service).
- • Production adoption for new projects (repo is archived and functionality merged into typia; no longer maintained).
Interface
Authentication
No built-in auth mechanism is described for this package. Example code shows passing API keys to the external LLM client (e.g., OpenAI), and HTTP connection details to your backend (host URL), but not auth handling inside this library.
Pricing
Open-source npm package; pricing not indicated in provided data.
Agent Metadata
Known Gotchas
- ⚠ Package is archived; functionality is merged into typia—ensure you use maintained replacements for production.
- ⚠ LLM tool calling may produce type mismatches; you should perform validation and feed errors back to the model as shown.
- ⚠ HTTP execution depends on your backend availability/behavior; the library does not appear to document retry/idempotency semantics for safe replays.
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Scores are editorial opinions as of 2026-03-30.