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Unofficial Substack API reference — 129 verified endpoints with body shapes, gathered across 14 capture rounds. Read + write side fully mapped. Includes Claude Agent SDK skill manifest and TypeScript client.

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Substack Skill API / Agent Reference

by ada1981·Jun 24, 2026·4 points·0 comments
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AI Analysis

●MidNiche Gem

Comprehensive Substack API docs, but it's still just documentation for an unofficial API.

Strengths
  • •129 endpoints verified across 14 capture rounds with actual request/response examples
  • •OpenAPI 3.1 spec enables typed client generation in any language
  • •Claude Agent SDK skill manifest ready for AI agent integration
Weaknesses
  • •Unofficial API with no Substack support—endpoints can change without notice
  • •Just documentation, not a working client library or SDK
Target Audience

Developers building Substack integrations or AI agents

Similar To

substack_api (NHagar) · python-substack (ma2za)

Post Description

If you guys are interested in giving your AI agents access to Substack, I just released what I think is the most comprehensive unofficial API reference ever compiled.

Discovered, mapped and tested 129 endpoints so you can fully control Substack via an agent.

https://github.com/AnthonyDavidAdams/substack-api-reference

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