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OpenAPI Specification

openapi: 3.2.0
info:
  title: Hanging Context public read Feeds API
  version: 1.0.0
  summary: Free, keyless JSON, Markdown and feeds for Hanging Context stories.
  description: 'Hanging Context publishes fresh context for agents. Stories are rebuilt every 12 hours. Each claim cites a Synorb Manifest. Every endpoint here is a read. No key is necessary. The same stories are also available through the MCP server at https://hangingcontext.com/mcp. Version policy: Breaking changes ship as a new version. We announce them at least 90 days ahead with Deprecation and Sunset response headers on the old version, and on the /developers page. Paging uses a cursor. Each REST list holds every story of its window, so the REST files have no cursor. To get only the stories that are new since your last call, call the MCP tool hc_since. It returns next_cursor and has_more, and you send next_cursor in your next call. Rate limit: 60 calls per 60 seconds per IP address for /ask and MCP tool calls.'
  termsOfService: https://hangingcontext.com/terms/reuse/
  contact:
    name: Hanging Context
    email: team@synorb.com
    url: https://hangingcontext.com/contact/
  license:
    name: Hanging Context reuse terms
    url: https://hangingcontext.com/terms/reuse/
  x-api-version: '1'
  x-sdks:
  - ecosystem: npm
    language: JavaScript
    package: hanging-context
    version: 0.1.0
    url: https://www.npmjs.com/package/hanging-context
    install: npm install hanging-context
    cli: hanging-context
  - ecosystem: pypi
    language: Python
    package: hanging-context
    version: 0.1.0
    url: https://pypi.org/project/hanging-context/
    install: pip install hanging-context
    cli: hanging-context
  x-pagination:
    style: cursor
    tool: hc_since
    cursor_field: next_cursor
    more_field: has_more
    note: Paging uses a cursor. Each REST list holds every story of its window, so the REST files have no cursor. To get only the stories that are new since your last call, call the MCP tool hc_since. It returns next_cursor and has_more, and you send next_cursor in your next call.
servers:
- url: https://hangingcontext.com
  description: Production
security: []
tags:
- name: Feeds
  description: Feeds for readers that poll.
paths:
  /editions/feed.json:
    get:
      operationId: getJsonFeed
      tags:
      - Feeds
      summary: Get the JSON Feed
      description: Get all stories as a JSON Feed, newest first.
      responses:
        '200':
          description: A JSON Feed document.
          content:
            application/feed+json:
              schema:
                $ref: '#/components/schemas/JsonFeed'
          headers:
            HC-API-Version:
              $ref: '#/components/headers/HC-API-Version'
        '404':
          description: No such file. The body is JSON, Markdown or HTML, chosen by the Accept header.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
            text/markdown:
              schema:
                type: string
            text/html:
              schema:
                type: string
      parameters:
      - $ref: '#/components/parameters/ApiVersion'
  /editions/feed.xml:
    get:
      operationId: getRssFeed
      tags:
      - Feeds
      summary: Get the RSS feed
      description: Get all stories as an RSS feed, newest first.
      responses:
        '200':
          description: An RSS document.
          content:
            application/rss+xml:
              schema:
                type: string
          headers:
            HC-API-Version:
              $ref: '#/components/headers/HC-API-Version'
        '404':
          description: No such file. The body is JSON, Markdown or HTML, chosen by the Accept header.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
            text/markdown:
              schema:
                type: string
            text/html:
              schema:
                type: string
      parameters:
      - $ref: '#/components/parameters/ApiVersion'
  /editions/atom.xml:
    get:
      operationId: getAtomFeed
      tags:
      - Feeds
      summary: Get the Atom feed
      description: Get all stories as an Atom feed, newest first.
      responses:
        '200':
          description: An Atom document.
          content:
            application/atom+xml:
              schema:
                type: string
          headers:
            HC-API-Version:
              $ref: '#/components/headers/HC-API-Version'
        '404':
          description: No such file. The body is JSON, Markdown or HTML, chosen by the Accept header.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
            text/markdown:
              schema:
                type: string
            text/html:
              schema:
                type: string
      parameters:
      - $ref: '#/components/parameters/ApiVersion'
components:
  schemas:
    JsonFeed:
      type: object
      description: A JSON Feed 1.1 document.
      required:
      - version
      - title
      - items
      properties:
        version:
          type: string
        title:
          type: string
        home_page_url:
          type: string
          format: uri
        feed_url:
          type: string
          format: uri
        items:
          type: array
          items:
            type: object
            properties:
              id:
                type: string
              url:
                type: string
                format: uri
              title:
                type: string
              date_published:
                type: string
                format: date-time
            additionalProperties: true
      additionalProperties: true
    Error:
      type: object
      description: The JSON error body.
      required:
      - error
      - message
      properties:
        error:
          type: string
          description: A short error code.
          example: empty_question
        message:
          type: string
          description: What is wrong.
        next_step:
          type: string
          description: What to do next.
        retry_after:
          type: integer
          description: Seconds to wait. Only for code 429.
  headers:
    HC-API-Version:
      description: The API version of this response.
      schema:
        type: string
        example: '1'
  parameters:
    ApiVersion:
      name: HC-API-Version
      in: header
      required: false
      description: The API version you expect. Version 1 is the only version today. Every response carries the HC-API-Version header.
      schema:
        type: string
        enum:
        - '1'
        default: '1'
externalDocs:
  description: 'Hanging Context developers: the MCP server, the SDKs and the CLI, rate limits and errors.'
  url: https://hangingcontext.com/developers/