Agent Web Atlas · public record · free to read

The independent record of what every agent tool can do, and when that changed.

InterfaceDelta reads public MCP, OpenAPI and A2A interfaces from outside, without calling a tool. It keeps every version and shows where a tool’s own declarations and our observations differ. We publish facts, not grades.

Browse the atlas Verify a label Sample Passport Declared and observed How it is built Is your MCP server listed?Live demo

Every version kept: 6,884services from the Official MCP Registry, observed from outside.Browse the atlas
Declared vs observed: 202tools where the publisher’s own hints and our AI reading (beta) differ, of 20,665 with both. Either side can be wrong, so we show both.See where they differ
Signed capability labels: Ed25519A signed fact sheet for each service in the atlas, covering all of its tools. Withdrawn automatically on a breaking change. No plan changes what it says.Verify a label

Plate 1 · an excerpt of public entriesThe atlas, entry by entrySnapshot 15 Nov 2026, 22:05 UTC

Showing 500 of 6,884 entries. The legend describes the entries shown.

MCP only344
MCP + server card, ARD or WebMCP89
With A2A49
With OpenAPI18

Of these, drawn as an outline: no tools read in the latest observation313

Colour is the protocol observed or a change class, never a judgement. A cut corner records that payment was asked for, not what it costs. Newest observation first; change classes cover the last 30 days. Not ranked.

This week What changed, what broke, and who asks for payment. Every number links to its evidence.

Use it from your agent

For people

Ask your agent

Paste this into Claude, ChatGPT or any agent that can use MCP. It connects to the public record and answers from it. No account needed.

Read https://interfacedelta.com/llms.txt and connect to InterfaceDelta's public MCP server (https://interfacedelta.com/mcp/public). Then help me check the agent tools I use: what each one can do, whether it changed recently, and whether it asks for payment. Report the recorded facts, not verdicts.

For agents

Connect on your own

Read the public MCP server at https://interfacedelta.com/mcp/public with no key. For Record Check and the Record API, get a free key with one request: no browser, email or sign-in.

curl -X POST https://interfacedelta.com/api/v1/agent-keys

MCP docs Record Check llms.txt

Atlas changes

Changed in the last 30 days

338 of 1,430 compared entries changed; 14 had at least one breaking change. The plate counts only an entry’s latest change, so its breaking figure can be lower. Show all

15 Nov 2026, 21:05 UTCapi.keenable.aiai.keenable/web-searchBreakingfingerprint~~was be5dcb0b39bd~~now 184a89821bf0
15 Nov 2026, 21:05 UTCmcp.datamerge.aiai.datamerge/mcpIndeterminate~~was 25~~now 0 capabilitiesendpoint~~was valid~~now the tool list could not be read (the server returned a malformed response); the prompt list could not be read (the server returned a malformed response)tools~~was configure_datamerge, contact_enrich, contact_search, contact_search_unenriched, create_list +18 more~~
15 Nov 2026, 19:56 UTCplazmi.gggg.plazmi/plazmiIndeterminate~~was 38~~now 40 capabilitiestoolsnow jam, music
15 Nov 2026, 19:56 UTCpresign-guard.fizzl.euio.github.Fizzl13/presign-guardIndeterminatefingerprint~~was 1647257d2e00~~now cd0b9bcc9d49
15 Nov 2026, 19:55 UTCapi.gemmein.comcom.gemmein/mcpIndeterminatefingerprint~~was 1d5ddaa92a7d~~now a7f0961fc7cc
15 Nov 2026, 19:55 UTCdchub.cloudcloud.dchub/mcp-serverIndeterminatefingerprint~~was 36b97f8032ca~~now fda49a30fd00

Struck values are what the previous observation recorded; inserted values are what the latest recorded. Each class follows the published compatibility rules and describes the interface, not the service.

No scores.
Observed facts only. No grades, rankings or “safe” verdicts about anyone’s tool.
No gateway.
We sell no gateway or proxy, so the record has no stake in which tool you call.
No paid placement.
No entry is bought, boosted or hidden, and a publisher never pays for its own label.

For CI · free and open source

Fail the build when a tool your agent calls changes.

Connect
List the services your agents call in your lockfile, .interfacedelta/dependencies.json. npx interfacedelta@0.6.0 check checks them on every build. On Pro or Team, npx interfacedelta@0.6.0 watch keeps checking between builds. 10-minute quick start
Decide
Each change is classified deterministically, then decided by the file's own rules, owners and expiring acceptances: {"id":"breaking-blocks","when":{"classification":"breaking"},"then":"block"}.
Deliver
In CI, a block fails the build and names the change. On Pro or Team, a block or a warning also reaches its owner by Slack, a signed webhook, email or a GitHub issue, with the command that accepts it; the GitHub Action does the same with watch: true.

The CLI and the GitHub Action are open source and free. Repository checks between builds and decision delivery need Pro or Team, which are not yet open.

CLI and Action guide How delivery works interfacedelta-cli on GitHub

Plans · flat per account