v2.1.239

2.1.239

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+960 tokens

• NEW: Data: SDK MCP server errors field — Documents skipped --mcp-config entries on SDK init frames, including stable error categories, omitted affected servers, Remote Control bridge failures, and CI handling.
• NEW: Data: SendMessage ambiguous recipient display — Restores user-facing “not sent” explanations for inexact or duplicate agent names, unavailable or truncated session searches, and recipients that require exact-name or pinned-identity confirmation.
• NEW: Tool Description: Artifact content host network block guidance — Explains the Artifact content-host allowlist entry for personal and shared cloud environments and forbids republishing until Claude can read the live version.
• NEW: Tool Description: Artifact files guidance — Adds list_files and read_file actions for multi-file Artifacts, defaulting reads to the scratchpad while reserving out_dir for user-requested destinations.
• NEW: Tool Description: Artifact identical resubmission refusal, Tool Parameter: Artifact URL guidance, and Tool Parameter: Artifact force overwrite guidance — Require existing owned Artifact URLs for in-place updates, reject unchanged retries after stale-version conflicts, and reserve forced overwrites for explicit approval to discard a specific newer version.
• REMOVED: Skill: Artifact slides and Skill: Artifact spreadsheet — Remove the standalone editable slide-deck and spreadsheet Artifact skills and their template-preservation workflows.
• Agent Prompt: Security monitor for autonomous agent actions — Adds an unverifiable-deletion-scope soft block for runtime-computed destructive writes against shared or remote state, requiring a transcript-visible resolved target list or literal verified names within the user-approved scope.
• Skill: /insights report output — Reworks the restored /insights flow into an exact unwrapped shareable-report handoff, replaces the additional-context injection with report-header context, and forbids adding, omitting, or rewording any line.
• Tool Description: Artifact and Skill: Artifact design — Make HTML the default Artifact format, allowing Markdown only when a loaded skill explicitly requires it and converting shared Markdown documents into designed HTML pages rather than one-to-one transcriptions.
• Tool Description: Artifact publishing and update guidance; Skill: Artifact PR review, Skill: Design, and Skill: Whiteboard — Move Artifact reads from WebFetch to action: "read", returning owned pages as raw HTML and shared pages as isolated summaries—except same-session Slack-channel pages, which return full untrusted content—while updating dependent workflows to consume saved large-page results safely.
• Tool Description: Artifact publishing and update guidance, Tool Description: Artifact runtime capabilities guidance, and Tool Parameter: Artifact watch actions guidance — Distinguish unavailable, durable-wake, and live watch modes; expand capability examples to live or connected data, shared state, viewer identity, Claude questions, added files, and self-saving pages; and require re-read, merge, and republish handling when local source falls behind a page-authored version.
• Tool Description: Artifact live room guidance — Requires explicit per-publish approval to join a room and approval for every room_send, exposes joined rooms through status, and coalesces and caps incoming events so pages send summaries rather than streams.
• Data: Artifact MCP connector guidance — Expands Artifact MCP manifests from claude.ai and host connectors to include built-in connector guidance while retaining exact upstream-tool-name discovery.
• Data: Claude API reference — Python and Skill: Anthropic Python SDK 0.x to 1.x upgrade — Switch timeout and custom-client guidance to anthropic.Timeout/httpx2, expand output_format migration coverage, and preserve supported older-model sampling parameters through extra_body instead of deleting them blindly.
• Data: Background tasks changed event schema, SDK protocol capabilities field, Interrupt cancel queued parameter, Interrupt receipt still queued field, and SDK subagent stats schema — Add reinitialize snapshots for live background tasks, hosted-session exceptions to cancel-queued receipts, and held-back-result timing details for cost, duration, model usage, and subagent totals.
• System Prompt: Coordinator mode orchestration and Tool Description: ListAgents — Add capability-aware user-message routing, blocked worker outcomes, concise launch updates when no communications role exists, and teammates as addressable agents.
• System Reminder: Previously invoked skills — Broadens the post-compaction warning so request or argument text anywhere in restored skill bodies, including “User Request” sections, is historical context rather than a new live instruction.
• System Prompt: Interactive agent intro and System Prompt: Harness instructions — Add a collaborative-goals identity branch when no output style is active, alongside the existing software-engineering framing.
• Tool Description: Bash (Git commit and PR creation instructions) — Corrects generated pull-request bodies so summary and test-plan templates appear under their matching headings and optional attribution follows the test plan.
• System Prompt: Auto memory durable lesson instructions — Adds a runtime note about the configured memory directory alongside the persistent-memory introduction.