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This week in agent interfaces

4 Nov 2026 – 11 Nov 2026 UTC

Seven days ending at the snapshot time: .

Public entries
5,124

All entries in this public snapshot. Evidence and definition

New this week
3,139

Entries with a recorded first-observation baseline in the window. Evidence and definition

Recorded changes
233

Entries with at least one recorded change in retained history in the window. Evidence and definition

Breaking
31

Changed entries with at least one breaking change in the window. Evidence and definition

Indeterminate
144

Changed entries with at least one indeterminate change in the window. Evidence and definition

Asks for payment
2

Entries whose latest observation has an MCP endpoint answering HTTP 402. Evidence and definition

Protocols in the latest observation

Entries where each protocol was detected. An entry can have more than one protocol.

Plate 1 · one square per public entryThe atlas, entry by entrySnapshot
  • MCP only4,604
  • MCP + server card, ARD or WebMCP136
  • With commerce: UCP, ACP or AP215
  • With A2A80
  • With OpenAPI53
  • Latest change breaking, 30 days26
  • Latest change indeterminate, 30 days210

Of these, drawn as an outline: no tools read in the latest observation2,735

Of these, drawn with a cut corner (a ring if no protocol was detected): asks for payment, an MCP endpoint answered HTTP 4022

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.

Notable recorded changes

Up to six entries, newest change first, from the same feed as the home page.

  1. digitalgemology.comcom.digitalgemology/gemology-glossaryindeterminatefingerprintb87669b5ae4aeff5a1b8f444
  2. exniche.comcom.exniche/searchbreaking56 capabilitiestoolscheck_product_link
  3. brainonbnb.comcom.brainonbnb/bsc-token-preflightindeterminatefingerprint63247d6bf9482f26aecd59e4
  4. mcp.corpusfetch.comcom.corpusfetch/corpusfetchindeterminatefingerprint435be4119d1d329c05495054
  5. agentcosthub.comcom.agentcosthub/agent-cost-hubbreakingfingerprint785ebe1465ec6994d61bc56a
  6. cellarion.appapp.cellarion/wine-registryindeterminatefingerprint9022ccbfdec06867ffb0655a

Copy post text

This week in agent interfaces (InterfaceDelta atlas, 4 Nov 2026 – 11 Nov 2026 UTC)

5,124 agent-facing services on record, 3,139 new this week.
233 changed their interface; 31 of those had a breaking change and 144 an indeterminate one.
2 ask for payment before answering (HTTP 402).

Every number links to its evidence: https://interfacedelta.com/atlas/weekly

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How to read this week

The window includes both endpoints, from 2026-11-04T22:36:48.931Z to 2026-11-11T22:36:48.931Z. Future observations are excluded. Counts describe entries, not change events. Breaking and indeterminate counts can overlap.

The snapshot retains up to 20 observations per entry. New entries require a retained first-observation baseline; 0 entries have history too short to establish whether they were first observed in this window. Recorded change counts cover only retained history and may omit earlier changes. No week-over-week comparison is made.

The plate uses the existing census: its change colours describe the latest recorded change within 30 days, while the weekly numbers above cover seven days. Payment records an HTTP 402 response, not a price or a completed payment.

Atlas snapshot methodology