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Releases: adcontextprotocol/adcp-client-python

v4.0.0

22 Apr 12:44
2ffe024

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4.0.0 (2026-04-22)

⚠ BREAKING CHANGES

  • types: rename Asset content types to Content
  • server: pluggable TaskStore on A2A — unblock production A2A adoption
  • server: expert-review followups — tenant-scoped idempotency, A2A context_factory, ContextVar safety
  • types: AssetsNN semantic aliases + format_category shim + downstream smoke
  • sdk: ResolvedBrand.brand_manifest removed. Use .brand. CreateMediaBuyRequest.brand_manifest removed. Use brand. BrandManifest, FormatCategory, DeliverTo, PromotedProducts, PromotedOfferings, Pricing, PackageStatus imports now raise ImportError. See MIGRATION_v3_to_v4.md.
  • webhooks: ADCPClient webhook verification now requires raw_body to be passed through from the HTTP handler. Callers that relied on the implicit re-serialize-from-payload fallback will start seeing ADCPWebhookSignatureError until they plumb the raw body through from their framework's pre-parse hook. Fix path:
  • webhooks: get_adcp_signed_headers_for_webhook now signs the compact-separator JSON form of the payload. Callers that previously hand-serialized spaced JSON and POSTed it with content= will see signature mismatches after this change. The fix is to also serialize with separators=(",", ":") or switch to httpx json= which already uses that form.
  • serve(mount=...) kwarg removed.
  • Budget.authority_level is removed. Migrate to reallocation_threshold / reallocation_unlimited on plan.budget, and set plan.human_review_required for decisions affecting data subjects. See the rc.4 migration section in README.md.

Features

  • A2A server support in serve() (d0c3015)
  • A2A server support in serve() (4e5db4f), closes #175
  • a2a: auto-retain contextId + taskId across multi-turn calls (0564635)
  • a2a: auto-retain contextId + taskId across multi-turn calls (8a084ec)
  • ADCP 3.0 server DX helpers, type guards, and schema sync (de4a079)
  • ADCP 3.0 server DX helpers, type guards, and schema sync to latest (bf0d81d)
  • AdCP RFC 9421 request-signing profile (ba53961)
  • add collection_list and sync_governance task methods (2dbeac1)
  • address PR review — real-world transforms and SDK error types (cfaa9c5)
  • AssetsNN aliases, format_category shim, MCP adoption hooks — unblock salesagent (ed7d30a)
  • auto-inject context passthrough in create_tool_caller (4d4fe5e)
  • bump to 4.0.0b1 with test fixtures updated for new schema shape (dcd6709)
  • bundle-based schema sync + Sigstore verify + 4.0.0b1 on latest (755071a)
  • error translation helper for multi-transport servers (7825ed6)
  • error translation helper for multi-transport servers (#176) (88126d1)
  • examples: add seller_agent.py reference impl (40341c9)
  • idempotency_key auto-injection, typed errors, and capability gate (af9dd2d)
  • idempotency_key auto-injection, typed errors, and capability gate (12cc983)
  • implement AdCP RFC 9421 request-signing profile (fc995e9)
  • MCP response + error extraction per AdCP spec (d991b1e)
  • MCP response + error extraction per AdCP spec (896beb8)
  • mcp: auto-generate sync_governance inputSchema from Pydantic (ac1edb3)
  • mcp: inline $defs in generated inputSchema (closes #208) (8eaeb4d)
  • mcp: inline $defs in generated inputSchema (closes #208) (ffa58e5)
  • migrate+types: v3->v4 codemod, strict-validation flag, version helpers, subclass test (0f50d39)
  • migrate+types: v3->v4 codemod, strict-validation flag, version helpers, subclass test (32bfbeb)
  • salesagent review feedback - typed error codes, state machine export, missing types (8ef8161)
  • schemas: regen for AdCP 3.0 GA — custom pricing + experimental_features (4dfaffe)
  • schemas: regen for AdCP 3.0 GA — custom pricing + experimental_features (db913ba), closes #204
  • sdk: 4.0 beta cleanup — version wiring, brand_manifest drop, migration guide (ebaab12)
  • server+migrate: round-1 feedback followups (dbbc390)
  • server+migrate: round-1 feedback followups (0fe9cb5)
  • server: AccountAwareToolContext + multi-tenant contract doc (69fd3da)
  • server: AccountAwareToolContext + multi-tenant contract doc (3747939)
  • server: context_factory, tenant_id, DISCOVERY_TOOLS — unblock MCP adoption (2203c1d)
  • server: DISCOVERY_METHODS + document tools/list pre-auth posture (closes #222) (a26c948)
  • server: DISCOVERY_METHODS + lock tools/list pre-auth posture (closes #222) (ba2de29)
  • server: gate tools/list on method overrides (#220) (816d22c)
  • server: gate tools/list on method overrides (closes #220) (fc1a788)
  • server: idempotency middleware per AdCP #2315 spec (101713c)
  • server: idempotency middleware per AdCP #2315 spec (f708ed2)
  • server: middleware parity, auth, A2A parser hook, startup log ([549d190]...
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v3.12.0

16 Apr 02:43
1340ed2

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3.12.0 (2026-04-16)

Features

  • skill-based agent generation with storyboard validation (e0eef4c)
  • skill-based agent generation with storyboard validation (d9d8778)

Bug Fixes

  • authorization_type takes precedence over stale properties key (3fc9ed0)
  • resolve property_ids and property_tags in get_all_properties() (ef55dcb)
  • resolve property_ids and property_tags in get_all_properties() (eca6bd7), closes #172
  • SSRF protections for authoritative_location redirects (6d1c962)

v3.11.0

04 Apr 11:52
ba2d9c7

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3.11.0 (2026-04-04)

Features

  • ADCP 3.0.0-rc3 spec + full registry support (c3f6937)
  • implement ADCP 3.0.0-rc3 spec with full registry support (edc9578)
  • remove all backward-compat type stubs for clean 3.0.0 surface (a45cdf5)

Bug Fixes

  • add backward-compat FormatCategory/FormatType enum stub (756ed50)
  • clean up formatting in registry_sync and property_registry (44a1914)
  • remove accidental cursor file, add to .gitignore (2650f8e)
  • remove stale buyer_campaign_ref from MCP tool schemas (3c7a2c8)

v3.10.0

17 Mar 00:45
99496ac

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3.10.0 (2026-03-17)

Features

  • add feature capability validation API (supports/require) (d550c08)
  • add RC2 governance support and full spec coverage (523ea20)
  • feature capability validation API (supports/require) (f86f6c4)
  • filter MCP tools by handler type, add webhook replay protection (ae7f378)

Bug Fixes

  • address PR review feedback (FieldModel collision, handler boilerplate, deprecation aliases) (b9eac61)
  • replace TypeAdapter with model_validate, tighten slug regex (103d616)
  • require webhook headers when secret configured, restrict unknown handler tools (12f1080)
  • walk MRO for tool filtering, add tool name validation (39985e5)

v3.9.1

16 Mar 16:51
e415f23

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3.9.1 (2026-03-16)

Bug Fixes

  • flatten validation-only oneOf schemas for consumer subclassing (3171a95)
  • flatten validation-only oneOf schemas to single subclassable classes (c242a7d)

v3.9.0

13 Mar 14:37
35740b3

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3.9.0 (2026-03-13)

Features

  • add RootModel getattr proxy and minimal sales agent example (#150) (f1c3990), closes #145 #148

Bug Fixes

  • add raw_body support for verification and use Unix timestamps (4a663e5), closes #151
  • set AdCPBaseModel extra='ignore' and remove obsolete generate_models.py (#157) (21077d9)
  • unwrap RootModel unions for consumer subclassing (#156) (8fd7b92)
  • use default JSON separators for webhook HMAC signing (2223f6e)
  • use default JSON separators for webhook HMAC signing (0dd495f), closes #151

v3.8.0

01 Mar 13:32
03dcd68

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3.8.0 (2026-03-01)

Features

Bug Fixes

  • resolve CI failures from GetSignalsRequest union alias (#144) (f135651)

v3.7.0

01 Mar 00:55
8b4e7db

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3.7.0 (2026-02-28)

Features

v3.6.0

23 Feb 02:14
a08805d

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3.6.0 (2026-02-23)

Features

  • sync upstream schemas and add get_media_buys (#136) (3625a2b)

v3.5.0

22 Feb 01:33
5576bf4

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3.5.0 (2026-02-22)

Features

  • sync upstream catalog schemas and add catalog type support (#134) (9de1eda)