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4.1.0 (2026-04-30)

⚠ BREAKING CHANGES

• migration: FormatId.__name__ and __qualname__ change from "FormatId" to "FormatReferenceStructuredObject" because AdCP 3.0.1 polished the schema title on core/format-id.json. The public adcp.FormatId alias keeps working — Format(format_id= FormatId(...)) and isinstance(x, FormatId) are unchanged. Two niche cases break: pickled FormatId instances from 4.0 fail to unpickle on 4.1, and snapshot tests / log scrapers asserting on __name__ see the rename. See MIGRATION_v4.0_to_v4.1.md.
• a2a: ADCPClient.pending_task_id is now ADCPClient.active_task_id (same for A2AAdapter). The constructor's context_id= kwarg and reset_context() now raise TypeError (was ValueError) on non-A2A protocols — the string value is fine, the operation doesn't apply to MCP.

Features

• a2a: checkpoint/from_checkpoint API, harden context-id retention (a17ffb3)
• a2a: expose peer protocol versions, add force_a2a_version pin (3898c53)
• a2a: migrate to a2a-sdk 1.0 with 0.3 wire-compat shim (c07db7d)
• a2a: migrate to a2a-sdk 1.0 with 0.3 wire-compat shim (Release-As: 4.1.0) (28a4a13)
• adcp: support ADCP_BASE_URL env override in sync_schemas.py (#285) (a2bc977)
• adcp: sync canonical agent skills from protocol tarball (#275) (5312f05)
• agents: /claude-triage comment nudge (5af8b47)
• agents: /claude-triage comment nudge (d3b8b28)
• agents: add Claude Code routines scaffolding (aa23ef3)
• agents: add Claude Code routines scaffolding (d312abf)
• agents: add silent-triage path to triage prompt (6abb495)
• agents: commit .claude/agents/ experts for cloud routine access (55144f2)
• agents: migrate manual triage nudge to /triage slash-command-dispatch (#267) (6bd434d)
• agents: security + product review fixes for triage routine (cbafef5)
• agents: switch triage nudge prefix to @claude-triage (#265) (77bfce2)
• agents: triage bundles ready items, never splits issues (#266) (2227a6b)
• agents: triage default — execute when outcome is clear (e3f8a6c)
• agents: triage defer subtypes + partial-rollout linkage rule (#273) (c97aa95)
• agents: triage fires on comments + claude-triaging lifecycle label (#277) (604d795)
• agents: triage PR ergonomics — refs adcp#3121 (#279) (31606eb)
• agents: triage prompt handles RFC/epic/scope bucket/milestone (cac3525)
• agents: triage runs pre-PR build+test gate before expert review (#271) (8fcc5ee)
• agents: triage runs pre-PR expert review on diff before opening PR (#269) (46dd708)
• agents: triage v2 — expert consultation + race + coverage (bf6e18b)
• client: ADCPClient.from_mcp_client() factory for in-process MCP transport (#293) (d83aa53)
• signing: close 4 SSRF gaps and add opt-in port hardening (foundation audit) (84b837e)
• signing: default replay store, signed-fetch preset, migration guide (#272) (52019b8)
• signing: drain three foundation-audit deferreds (#298, #299, #300) (072998a)
• validation: schema-driven validation with client hooks and opt-in server middleware (5cbac87)
• validation: schema-driven validation with client hooks and opt-in server middleware (a38ff57)

Bug Fixes

• a2a: address expert-review feedback on 1.0 migration (7e54b97)
• adcp: skip eager httpx.AsyncClient alloc in WebhookSender.aenter on owned-client path (#301) (4bd45d1), closes #300
• agents: already-engaged check + tighten label creation (02baa89)
• agents: triage already-engaged + ship-more (missed in #259) (ca42d29)
• agents: webhook-miss sweep grace period (no double-fire) (#280) (3a5f1c2)
• deps: add types-protobuf to pip dev extras (801ac16)
• handlers: sync MEDIA_BUY_STATE_MACHINE with spec v3 enum (#289) (54fd18b)
• signing: validate-before-sign symmetry in deliver() + HMAC SSRF coverage + 4.1 migration notes (bc8da3a)
• triage: drop apostrophe from MODE text (port of adcp#3325) (#287) (2efa423)
• validation: address code + security review feedback (5bf9434)

Documentation

• migration: add v4.0 → v4.1 migration guide (#302) (01a1068)
• readme: note AAO IPR Policy requirement for contributors (43d77f9)
• readme: note AAO IPR Policy requirement for contributors (ba03ecb)

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