Update dependency Anthropic to 12.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
Anthropic (source)	12.16.0 → 12.21.0

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Release Notes

anthropics/anthropic-sdk-csharp (Anthropic)

v12.21.0: Anthropic: v12.21.0

Compare Source

12.21.0 (2026-05-13)

Full Changelog: Anthropic-v12.20.1...Anthropic-v12.21.0

Features

• api: Add BetaManagedAgentsSearchResultBlock types (3e20ea7)
• api: Add support for cache diagnostics beta (bf1ba59)

Chores

• api: spec updates (5fd91e0)

v12.20.1: Anthropic: v12.20.1

Compare Source

12.20.1 (2026-05-11)

Full Changelog: Anthropic-v12.20.0...Anthropic-v12.20.1

Bug Fixes

• internal: disable default HttpClient timeout as we have our own (fc84460)

v12.20.0: Anthropic: v12.20.0

Compare Source

12.20.0 (2026-05-06)

Full Changelog: Anthropic-v12.19.0...Anthropic-v12.20.0

Features

• api: add support for Managed Agents multiagents and outcomes, webhooks, vault validation (31b3066)

Bug Fixes

• api: Adjust webhook configuration (1fdd8a2)

v12.19.0: Anthropic: v12.19.0

Compare Source

12.19.0 (2026-05-05)

Full Changelog: Anthropic-v12.18.0...Anthropic-v12.19.0

Features

• client: allow targeting a workspace for OIDC federation token exchange (64d0a3f)

v12.18.0: Anthropic: v12.18.0

Compare Source

12.18.0 (2026-05-05)

Full Changelog: Anthropic-v12.17.0...Anthropic-v12.18.0

Features

• api: improve Managed Agents APIs (1bf373a)
• client: add Workload Identity Federation, interactive OAuth, and auth profiles (#​832) (cb1a18b)
• memory: add beta memory tool (#​814) (9ed1438)
• support setting headers via env (aa93247)

Bug Fixes

• client: Adjust credentials auth to be consistent with other SDKs (#​829) (7dd7106)
• client: map HostedFileContent with image media type to image block (#​183) (6ed6f2b)

v12.17.0: Anthropic: v12.17.0

Compare Source

12.17.0 (2026-04-23)

Full Changelog: Anthropic-v12.16.0...Anthropic-v12.17.0

Features

• api: CMA Memory public beta (011860b)
• client: Add prompt caching support via WithCacheControl extension to Microsoft.Extensions.AI (f007149)

Bug Fixes

• api: fix errors in api spec (c47a83f)
• api: restore missing features (48232d1)

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