TypeSpec

TypeSpec is an API description language developed by Microsoft for defining API shapes that compile to OpenAPI, JSON Schema, Protobuf, and other output formats. It provides a language and toolchain for describing REST APIs, gRPC services, and data schemas in a type-safe, composable way with built-in support for versioning, metadata, and extensibility via decorators and libraries.

TypeSpec is listed with 6 APIs on the APIs.io network. Tagged areas include API Design, Code Generation, Developer Tools, OpenAPI, and Protocol Buffers.

The TypeSpec catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

TypeSpec’s developer surface includes CLI, API reference, getting-started guide, documentation, engineering blog, release notes, and 24 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

32.5/100 thin ▬ flat Agent 4/100 human only Front door AI 1/6 silent self hosted · MIT Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

6 APIs 1 MCP Servers

API Design Code Generation Developer Tools OpenAPI Protocol Buffers Specification Language

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 32.5/100 · thin

Contract Quality 2.8 / 19

Developer Ergonomics 5.9 / 15

Access Clarity 1.2 / 15

Operational Transparency 3.6 / 10

Contract Governance 1.2 / 9

Discoverability 4.6 / 8

Regulatory Posture 1.6 / 15

Open Source Surface 10.0 / 10

Agent readiness — 4/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 75 points between them, because both conditional facets apply and carry 25 points together. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0

11 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 14.7 — up to +21.3 composite points
Access Clarity scores 7.9 — up to +18.4 composite points
Developer Ergonomics scores 39.3 — up to +12.1 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/typespec/apis.yml: open an issue on github.com/api-evangelist/typespec to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Buf Schema Registry (public Protocol Buffers modules, gRPC / ConnectRPC schema publishers)	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 3

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

Protocol Buffers

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

APIs 6

Individual APIs this provider publishes, each with its own machine-readable definition.

TypeSpec Compiler

The TypeSpec compiler processes `.tsp` TypeSpec files and emits output for configured emitters (OpenAPI, JSON Schema, Protobuf, etc.). It provides a programmatic Node.js/TypeScr...

TypeSpec OpenAPI Emitter

The TypeSpec OpenAPI emitter converts TypeSpec definitions to OpenAPI 3.0 specifications. It supports HTTP operations, request/response bodies, security schemes, and API version...

TypeSpec JSON Schema Emitter

Emits JSON Schema documents from TypeSpec model definitions, enabling data validation and type documentation workflows.

TypeSpec Protobuf Emitter

Emits Protocol Buffer `.proto` files from TypeSpec service definitions, enabling gRPC service generation from a single TypeSpec source.

TypeSpec HTTP Library

The TypeSpec HTTP library provides decorators and types for describing HTTP REST APIs including routes, operations, request bodies, query parameters, headers, and response codes.

TypeSpec REST Library

The TypeSpec REST library provides decorators for REST API patterns including resource operations (CRUD), collection operations, and standardized error response shapes.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

MCP Server

MCP SERVER

TypeSpec API pricing

Not yet checked against TypeSpec's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against TypeSpec's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Typespec Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Typespec Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Typespec Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Typespec Context

15 classes · 11 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

TypeSpec — jsonschema rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

TypeSpec Program

3 properties

JSON SCHEMA

JSON Structure 1

JSON Structure definitions describing this provider's data shapes.

Typespec Model Structure

8 properties

JSON STRUCTURE

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Typespec Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 4

Reference material describing how the API behaves

APIReference

APIReference

ContributionGuide

ContributionGuide

Documentation

Documentation

JSONSchema

JSONSchema

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

MCPServer

MCPServer

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Spectral

Spectral

JSONLD

JSONLD

Vocabulary

Vocabulary

Build 6

SDKs, sample code, and the tooling you integrate with

CLI

SDKs

Packages

CodeOfConduct

GitHubOrganization

GitHubOrganization

npm

npm

Access & Security 2

Authentication, authorization, and security posture

SecurityPolicy

SecurityPolicy

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

RateLimits

IssueTracker

Community

ReleaseNotes

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

License

License

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 3

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Playground

Playground

Source (apis.yml)

aid: typespec
name: TypeSpec
x-parent: microsoft
description: TypeSpec is an API description language developed by Microsoft for defining API shapes that compile to OpenAPI,
  JSON Schema, Protobuf, and other output formats. It provides a language and toolchain for describing REST APIs, gRPC services,
  and data schemas in a type-safe, composable way with built-in support for versioning, metadata, and extensibility via decorators
  and libraries.
type: Index
deliveryModel:
  model: self-hosted
  license: MIT
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  probe_state: covered
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://typespec.io/img/favicon.svg
tags:
- API Design
- Code Generation
- Developer Tools
- OpenAPI
- Protocol Buffers
- Specification Language
url: https://raw.githubusercontent.com/api-evangelist/typespec/refs/heads/main/apis.yml
created: '2026-03-25'
modified: '2026-05-19'
specificationVersion: '0.23'
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
common:
- type: LLMsTxt
  url: llms/typespec-llms.txt
- type: Spectral
  url: rules/typespec-jsonschema-spectral-rules.yml
- type: CLI
  url: cli/typespec-cli.yml
- type: Hosts
  url: hosts/typespec-hosts.yml
- type: Vendors
  url: vendors/typespec-vendors.yml
- type: SDKs
  url: packages/typespec-packages.yml
- type: Packages
  url: packages/typespec-packages.yml
- type: APIReference
  url: https://typespec.io/docs/libraries/sse/reference/
- type: GettingStarted
  url: https://typespec.io/docs/getting-started/getting-started-rest/01-setup-basic-syntax
- type: Plans
  url: plans/typespec-plans-pricing.yml
- type: RateLimits
  url: rate-limits/typespec-rate-limits.yml
- type: FinOps
  url: finops/typespec-finops.yml
- type: IssueTracker
  url: https://github.com/microsoft/typespec/issues
- type: SecurityPolicy
  url: https://github.com/microsoft/typespec/blob/main/SECURITY.md
- type: CodeOfConduct
  url: https://github.com/microsoft/typespec/blob/main/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/microsoft/typespec/blob/main/CONTRIBUTING.md
- type: License
  name: MIT
  url: https://github.com/microsoft/typespec/blob/main/LICENSE
- type: DomainSecurity
  url: security/typespec-domain-security.yml
- type: Website
  url: https://typespec.io
- type: Documentation
  url: https://typespec.io/docs
- type: GitHubOrganization
  url: https://github.com/microsoft/typespec
- type: npm
  url: https://www.npmjs.com/package/@typespec/compiler
- type: Playground
  url: https://typespec.io/playground
- type: Blog
  url: https://typespec.io/blog
- type: Community
  url: https://github.com/microsoft/typespec/discussions
- type: ReleaseNotes
  url: https://github.com/microsoft/typespec/releases
- type: JSONLD
  url: json-ld/typespec-context.jsonld
- type: Vocabulary
  url: vocabulary/typespec-vocabulary.yml
- type: JSONSchema
  url: json-schema/typespec-program-schema.json
- name: MCP Server
  url: https://github.com/microsoft/typespec-mcp
  type: MCPServer
apis:
- aid: typespec:typespec-compiler
  name: TypeSpec Compiler
  description: The TypeSpec compiler processes `.tsp` TypeSpec files and emits output for configured emitters (OpenAPI, JSON
    Schema, Protobuf, etc.). It provides a programmatic Node.js/TypeScript API for building TypeSpec tooling, custom emitters,
    and compilers.
  humanURL: https://typespec.io/docs
  tags:
  - API Design
  - Code Generation
  - Compilers
  - Specification Language
  tags_raw:
  - API Design
  - Code Generation
  - Compiler
  - Specification Language
  properties:
  - type: Documentation
    url: https://typespec.io/docs
  - type: GitHubRepository
    url: https://github.com/microsoft/typespec
  - type: npm Package
    url: https://www.npmjs.com/package/@typespec/compiler
  - type: Language Reference
    url: https://typespec.io/docs/language-basics/overview
- aid: typespec:typespec-openapi-emitter
  name: TypeSpec OpenAPI Emitter
  description: The TypeSpec OpenAPI emitter converts TypeSpec definitions to OpenAPI 3.0 specifications. It supports HTTP
    operations, request/response bodies, security schemes, and API versioning decorators.
  humanURL: https://typespec.io/docs/emitters/openapi3/reference
  tags:
  - Code Generation
  - OpenAPI
  - REST API
  properties:
  - type: Documentation
    url: https://typespec.io/docs/emitters/openapi3/reference
  - type: npm Package
    url: https://www.npmjs.com/package/@typespec/openapi3
  - type: GitHubRepository
    url: https://github.com/microsoft/typespec/tree/main/packages/openapi3
- aid: typespec:typespec-json-schema-emitter
  name: TypeSpec JSON Schema Emitter
  description: Emits JSON Schema documents from TypeSpec model definitions, enabling data validation and type documentation
    workflows.
  humanURL: https://typespec.io/docs/emitters/json-schema/reference
  tags:
  - Code Generation
  - JSON Schema
  - Validation
  tags_raw:
  - Code Generation
  - JSON Schema
  - Validation
  - JSON-Schema
  properties:
  - type: Documentation
    url: https://typespec.io/docs/emitters/json-schema/reference
  - type: npm Package
    url: https://www.npmjs.com/package/@typespec/json-schema
- aid: typespec:typespec-protobuf-emitter
  name: TypeSpec Protobuf Emitter
  description: Emits Protocol Buffer `.proto` files from TypeSpec service definitions, enabling gRPC service generation from
    a single TypeSpec source.
  humanURL: https://typespec.io/docs/emitters/protobuf/reference
  tags:
  - Code Generation
  - gRPC
  - Protocol Buffers
  properties:
  - type: Documentation
    url: https://typespec.io/docs/emitters/protobuf/reference
  - type: npm Package
    url: https://www.npmjs.com/package/@typespec/protobuf
- aid: typespec:typespec-http-library
  name: TypeSpec HTTP Library
  description: The TypeSpec HTTP library provides decorators and types for describing HTTP REST APIs including routes, operations,
    request bodies, query parameters, headers, and response codes.
  humanURL: https://typespec.io/docs/libraries/http/reference
  tags:
  - Decorators
  - HTTP
  - REST API
  properties:
  - type: Documentation
    url: https://typespec.io/docs/libraries/http/reference
  - type: npm Package
    url: https://www.npmjs.com/package/@typespec/http
- aid: typespec:typespec-rest-library
  name: TypeSpec REST Library
  description: The TypeSpec REST library provides decorators for REST API patterns including resource operations (CRUD), collection
    operations, and standardized error response shapes.
  humanURL: https://typespec.io/docs/libraries/rest/reference
  tags:
  - Decorators
  - Resource Pattern
  - REST API
  properties:
  - type: Documentation
    url: https://typespec.io/docs/libraries/rest/reference
  - type: npm Package
    url: https://www.npmjs.com/package/@typespec/rest
x-coverage:
  state: covered
  reason: enriched
  detail: TypeSpec is an open-source API description language and toolchain (no hosted API); its own docs llms.txt, npm packages,
    CLI and local-stdio MCP server are recorded.
  evidence:
  - url: https://typespec.io/docs/llms.txt
    status: 200
  checked: '2026-11-04'
x-enrichment:
  date: '2026-11-04'
  status: enriched
  artifacts_added: 1
  pass: local-v6

TypeSpec API — frequently asked questions

Does TypeSpec have an API?

Yes. APIs.io lists 6 APIs from TypeSpec, including TypeSpec Compiler, TypeSpec OpenAPI Emitter and TypeSpec JSON Schema Emitter, and 3 more.

How much does the TypeSpec API cost?

APIs.io lists 3 pricing plans for TypeSpec, with each plan's price, limits and inclusions under Pricing on this page.

Does TypeSpec have an MCP server?

Yes. APIs.io lists 1 MCP server for TypeSpec.

Is the TypeSpec API ready for AI agents?

TypeSpec has a Kin Score of 32.5 out of 100 (thin) and an Agent Readiness score of 4.1 (human-only), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/typespec"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/typespec/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/typespec/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

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A second provider on the same verified email joins the account you already have.