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Update changelog for v2.1.176

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@ -4,6 +4,30 @@ Note: Only use **NEW:** for entirely new prompt files, NOT for new additions/sec
### Claude Code System Prompts Changelog
# [2.1.176](https://github.com/Piebald-AI/claude-code-system-prompts/commit/32401a1)
_+4,360 tokens_
- **REMOVED:** System Prompt: Claude in Chrome skill note — Removes the note telling the agent to invoke the `claude-in-chrome` skill (via the Skill tool) before using any `mcp__claude-in-chrome__*` browser tools.
- Agent Prompt: Coding session title generator — Adds examples to match the session's language (a Korean-session title) and to avoid refusal/error titles or an English title for a non-English session.
- Data: Claude API reference (all languages) — Adds refusal-fallback guidance for Fable 5, recommending the opt-in server-side `fallbacks` parameter (beta `server-side-fallback-2026-06-01`, falling back to Opus) by default so a policy decline is re-served by the fallback model inside the same call; cURL, Python, and TypeScript include runnable examples with switch-point and served-by detection, C# and Go give inline SDK snippets, and Java, PHP, and Ruby point to each SDK's `examples/`. Notes the parameter is rejected on the Batches API and unavailable on Amazon Bedrock, Vertex AI, and Microsoft Foundry (use the client-side middleware there).
- Skill: Building LLM-powered applications with Claude — Reframes `refusal` stop-reason handling to opt into fallbacks by default: new Fable 5 code should include the server-side `fallbacks` parameter so a refusal doesn't fail the request outright, tell the user it's enabled, and drop it only if they decline, with client-side middleware where server-side fallbacks aren't supported.
- Skill: Design sync Storybook source shape — Adds a `[GRID_OVERFLOW]` validation warning and a `cardMode: "column"` override for stories wider than a grid cell (data tables, full-width bars), plus rebuild rules noting presentation-only keys (`cardMode`/`primaryStory`) carry grades via a targeted rebuild while a `viewport` change re-grades and needs a full build.
- Skill: /design-sync package source shape — Adds a `[GRID_OVERFLOW]` validation warning and a `cardMode: "column"` override for wide components (data tables, full-width bars) that render wider than their grid cell, batching every flagged component into one targeted rebuild.
- Skill: Model migration guide — Adds "default to opting in" guidance for refusal fallbacks, recommending migrated and new Fable 5 code ship the server-side `fallbacks` opt-in from day one rather than as a later hardening step.
- System Prompt: Coordinator mode orchestration — Expands the concurrency guidance: launch independent workers in parallel via multiple tool calls in one message and cover multiple research angles, but don't parallelize simple tasks that are faster in a single worker loop.
- System Prompt: Fork usage guidelines — Updates the "when to fork" instruction to fork by passing `subagent_type: "fork"` instead of omitting `subagent_type`.
- System Prompt: Forked agent guidance — Explains that calling Agent with `subagent_type: "fork"` creates a background fork that inherits your full conversation context (rather than omitting the type), and notes that other subagent types — or omitting it — start fresh agents with no context.
- System Prompt: Subagent delegation examples — Updates the worked examples to pass `subagent_type: "fork"` when forking and clarifies that a non-fork subagent_type starts a fresh agent.
- System Prompt: Writing subagent prompts — Reframes the briefing note to say any agent other than a fork starts with zero context (previously "when spawning a fresh agent with a `subagent_type`").
- Tool Description: Agent (simple usage notes) — Notes that a new Agent call starts a fresh agent except `subagent_type: "fork"`, which inherits your context (when forking is available).
- Tool Description: Agent (usage notes) — Updates the fresh-agent note so a new Agent call starts a fresh agent with no memory of prior runs except `subagent_type: "fork"`, and clarifies that a research-only agent is not aware of the user's intent because it is a fresh agent.
- Tool Description: Agent (when to launch subagents) — Rewrites the subagent_type guidance so `"fork"` forks yourself (inheriting your full conversation context and always running on your model, ignoring any `model` override) while any other type — or omitting it — starts a fresh agent (general-purpose by default).
- Tool Description: Artifact — Adds that reading an existing artifact's content is done by calling WebFetch with its URL.
- Tool Description: claude.ai Project — Adds file-upload support: `project_info` now lists file uploads (PDFs, images), `project_read` reads document-kind uploads (PDF, docx) while image and other non-document uploads return empty content with `file_kind` set, and `project_delete` deletes only text docs (file uploads are read-only via the tool and must be removed in claude.ai).
- Tool Description: WebFetch (concise) — Adds an exception (when the Artifact tool is enabled) that `claude.ai/code/artifact/{uuid}` URLs ARE fetchable via your claude.ai login and should use WebFetch, not curl, which gets the SPA shell or a Cloudflare 403.
- Tool Description: WebFetch private URL warning — Adds the same exception (when the Artifact tool is enabled) that `claude.ai/code/artifact/{uuid}` URLs (including preview.claude.ai) are fetchable via the claude.ai login and should use WebFetch, not curl or a headless browser.
#### [2.1.175](https://github.com/Piebald-AI/claude-code-system-prompts/commit/4d0bab0)
<sub>_No changes to the system prompts in v2.1.175._</sub>