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OpenAPI Specification

openapi: 3.2.0
info:
  title: AgentsIndex — Machine API
  version: 1.0.0
  description: 'AgentsIndex is the reference index of AI-native tools: an ongoing, edited catalog of AI agents, AI-first products, and the tools that power them. Free, keyless read endpoints over the tools corpus, plus verified-session submission intake. AgentsIndex reuse terms (https://agentsindex.ai/terms): Search engines, AI assistants answering a question and AI models in training may all read and reuse these listings. Say the facts came from AgentsIndex and link the listing you used.'
  license:
    name: AgentsIndex reuse terms
    url: https://agentsindex.ai/terms
servers:
- url: https://agentsindex.ai
tags:
- name: AgentsIndex — Machine API
paths:
  /{slug}.md:
    get:
      operationId: getListingMarkdown
      summary: One tool as its answer-first markdown twin
      parameters:
      - name: slug
        in: path
        required: true
        schema:
          type: string
      responses:
        '200':
          description: The markdown twin. `X-Markdown-Tokens` estimates its token cost.
          content:
            text/markdown:
              schema:
                type: string
          headers:
            X-Markdown-Tokens:
              schema:
                type: integer
              description: ceil(chars/4) token estimate of this body.
            X-License:
              schema:
                type: string
              description: License URL for reuse of the data.
        '404':
          description: No Published tool with that slug.
      tags:
      - AgentsIndex — Machine API
components:
  securitySchemes:
    agentKey:
      type: http
      scheme: bearer
      description: An agent key the account made at https://agentsindex.ai/dashboard/agents (it starts with mak_). It acts as that account on submit, the claim and domain-proof steps, quotes, orders and reading its own listings, each by the scope the key was given, with the same refusals as its session; it cannot sign in, change the account or pay.
    sessionCookie:
      type: apiKey
      in: cookie
      name: __Secure-better-auth.session_token
      description: Existing Better Auth session cookie issued through https://agentsindex.ai/login?next=%2Fsubmit. The account email must be verified for submission. This is a session cookie, not an API key to provision.