[hpiclaranet]

Summary

Rebased onto current main (7584b133, anthropic 0.3.34 via #3919 "Claude Opus 5.5") — supersedes #3725 with the same change set (#3725 was closed with a pointer to this PR). Version bumped to 0.3.35.

Three low-risk hygiene fixes in the Anthropic provider, verified against the installed anthropic SDK (1.4.0) and current official documentation:

1. Full-payload logging demoted from INFO to DEBUG — six log statements dumped full request payloads, transformed tool schemas, the cache-block candidates (before pruning), the full API response, and every streamed chunk at INFO. The plugin daemon runs at INFO by default (main.py + the SDK's plugin_logger_handler), so every user prompt, system prompt, and response was written to daemon stdout on every invocation. They are now DEBUG behind a module-level _debug_logging_enabled() guard — and the expensive _sanitize_for_logging() deep-copy of the request payload is also skipped when DEBUG is off. (Response and streamed-chunk logs remain unredacted when DEBUG is on.)
2. Obsolete pdfs-2024-09-25 beta header removed — PDF (document) support is GA; the current official docs show PDF requests with no beta header. The document block itself is unchanged and continues to be sent.
3. Unreachable redacted_thinking delta branches removed from the stream handler. The SDK's RawContentBlockDelta union is TextDelta | InputJSONDelta | CitationsDelta | ThinkingDelta | SignatureDelta — there is no redacted-thinking delta type, so both elif chunk.delta.type == "redacted_thinking" branches could never execute. Redacted thinking arrives via content_block_start (a RedactedThinkingBlock), which is still handled; the two close-tag conditions simplify from in ("thinking", "redacted_thinking") to == "thinking". The input_json_delta/tool-use handling from fix(anthropic): stream tag duplication, 529 mapping, image fetch hardening #3907 is preserved.

Release Notes

• Reduced plugin log volume: full API request/response dumps now log at DEBUG instead of INFO
• Stop sending the obsolete pdfs-2024-09-25 beta header for PDF input (PDF support is GA)
• Removed dead stream-handling code for a delta type the Anthropic SDK does not emit

Change Type

• Documentation / non-plugin change
• Non-LLM plugin (tools, extensions, datasource, etc.)
• LLM plugin

Screenshots / Videos

Not applicable — logging levels, request headers, and dead code removal, covered by unit tests.

LLM Plugin Checklist

Areas affected by this change (check all that apply)

• Message flow (system messages, user ↔ assistant turn-taking)
• Tool interaction flow (multi-round usage, Agent App and Agent Node)
• Multimodal input (images, PDFs, audio, video, etc.)
• Multimodal output (images, audio, video, etc.)
• Structured output (JSON, XML, etc.)
• Token consumption metrics
• Other LLM functionality (reasoning, grounding, prompt caching, etc.)
• New models / model parameter fixes

Version

• Bumped top-level version in manifest.yaml (not the one under meta) — 0.3.34 → 0.3.35 (0.3.34 taken by feat(anthropic): add Claude Opus 5.5 #3919)
• dify_plugin>=0.10.2 is declared in pyproject.toml and locked in uv.lock (>=0.3.0 satisfied; upper bound left open as inherited from main — same as sibling plugins)

Testing

• Local deployment — plugin suite in a clean uv venv aligned with manifest.yaml, pyproject.toml, and uv.lock (no Dify platform deployment in this run): full anthropic suite passes on the rebased head (4e416e34, main 7584b133, SDK 1.4.0) — 137 passed, 16 skipped (the 16 are live-API tests, no ANTHROPIC_API_KEY set; includes the Opus 5.5 tests from feat(anthropic): add Claude Opus 5.5 #3919). ruff check reports zero findings on the changed files.
• SaaS (cloud.dify.ai)

Known limitations (pre-existing, out of scope here):

• The beta-header removal is validated for the official Anthropic API (GA per current docs). A non-standard third-party proxy configured via the anthropic_api_url credential that still required the legacy pdfs-2024-09-25 header would not receive it — no such requirement exists in any official endpoint.
• The legacy claude-3-5-sonnet-20240620 max-tokens beta header assignment uses direct assignment rather than comma-join composition (pre-existing; that model does not combine with the other beta features).
• DEBUG logs can contain raw prompt/response content (only request-payload dumps truncate long data fields; response and stream chunks are logged as-is); keep DEBUG off in production.

[crazywoola]

Thank you for your contribution, @hpiclaranet! This PR currently has merge conflicts with main, so we are closing it for now. Please update your branch against the latest main and resolve the conflicts — note that the consolidated dependency refresh (#4106–#4111) has bumped plugin manifest.yaml versions on main, so please bump models/anthropic/manifest.yaml to the next unused version when you rebase. You are welcome to open a new PR with the updated changes and link back to this one. We appreciate your time and effort!