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Substack scores 80 out of 100 on the Agent Readiness Index
Substack reaches level 4, Trusted. Web experience is the strongest area at 96 out of 100. Discoverability is the weakest at 64.
Substack was scanned on October 14, 2026. Its score is 80 out of 100, level 4, Trusted. A customer can authorize an agent with limited, revocable access. To reach level 5, Native: Support agents on every channel: passkeys, a high assurance profile and a voice line scoring 70 or more.
Website: substack.com
Score by area
| Area | Score | What it asks |
|---|---|---|
| Discoverability | 64 out of 100, worth 15 points | Can an agent find and read your pages? |
| Protocol access | 80 out of 100, worth 20 points | Can an agent connect to you through MCP or an API? |
| Identity and delegation | 80 out of 100, worth 20 points | Can a customer give an agent limited access without sharing a password? |
| Web experience | 96 out of 100, worth 15 points | Does your site work when an agent uses it? |
| Voice and IVR | Not measured yet | What happens when an agent calls your phone line? |
| Policy and governance | Not measured yet | Do your terms allow agents that act for customers? |
What is holding Substack back
- Passkeys at sign in, 4 points lost. No passkey signal was found on the sign in page or in the published pages read. A prompt that starts only after a person types is not visible to the scan. Fix: Offer passkeys with conditional UI on the sign in page and for step up approvals.
- llms.txt guide for agents, 3 points lost. No llms.txt file was found at the site root. Fix: Publish /llms.txt with links to product, pricing, support and location pages.
- Structured data on the home page, 3 points lost. No JSON LD structured data was found on the home page. Fix: Add JSON LD for your organization type, Product or Service, Offer and FAQPage on the pages customers ask about most.
- MCP server, 3 points lost. The official MCP registry lists io.github.marcomoauro/substack mcp, but the scan did not reach a live endpoint. Fix: Publish a remote MCP server with OAuth. Start with read only tools such as account status, orders or location search, and publish a server card at /.well known/mcp/server card.
What already works
- OAuth and OpenID metadata
- Developer and data sharing program
- PKCE and client registration
How Substack compares
The average score for media and entertainment is 42.5 out of 100 across 80 organizations. The average across all 1,420 scored organizations is 42.2 out of 100.
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