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Update changelog for v2.1.154

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CHANGELOG.md
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### Claude Code System Prompts Changelog
# [2.1.154](https://github.com/Piebald-AI/claude-code-system-prompts/commit/f636ff2)
_+11,516 tokens_
- **NEW:** Agent Prompt: /simplify slash command — Adds `/simplify` behavior that runs four cleanup agents for reuse, simplification, efficiency, and altitude findings, then applies safe fixes while skipping behavior-changing or out-of-scope suggestions.
- **NEW:** Data: Claude Code live documentation sources — Adds official Claude Code documentation URLs and topic-specific WebFetch prompts for commands, settings, hooks, MCP, skills, subagents, IDEs, deployment, security, and related surfaces.
- **NEW:** Data: Claude Code recent changes reference — Adds a reference for renamed or removed Claude Code commands, flags, and terms, including `/output-style`, `/pr-comments`, `/vim`, `/extra-usage`, `--enable-auto-mode`, and stale naming guidance.
- **NEW:** Skill: Claude Code configuration guide — Adds a Claude Code configuration skill that checks the live build, bundled recent-change references, and current documentation before answering questions about commands, flags, settings, hooks, skills, MCP servers, subagents, IDE integrations, and related configuration.
- Agent Prompt: Claude guide agent — Adds stale-knowledge handling that tells the guide agent to disclose documentation fetch failures instead of silently answering Claude Code command, flag, or settings questions from memory.
- Agent Prompt: Security monitor for autonomous agent actions (first part) — Expands security review with explicit final-destination tracing for writes, commits, pushes, uploads, publishes, and sent data before deciding whether a boundary-crossing action should be blocked.
- Agent Prompt: Security monitor for autonomous agent actions (second part) — Strengthens data-exfiltration rules around trust boundaries, automated pathways, unverified destinations, credential leakage into persistent artifacts, and destination/resource/operation-scoped allow exceptions.
- Data: Anthropic CLI — Updates Anthropic CLI authentication guidance to cover SDK-style credential resolution, OAuth profiles from `ant auth login`, `ant auth print-credentials`, bearer-token usage for raw HTTP, and precedence between API keys and auth tokens.
- Data: Claude API reference — cURL — Updates examples and adaptive-thinking guidance for Opus 4.8.
- Data: Claude API reference — Go — Updates the recommended Go SDK model constant and examples from Opus 4.7 to Opus 4.8.
- Data: Claude API reference — Python — Updates credential guidance for API keys, auth tokens, and `ant auth login`; adds beta mid-conversation system-message examples; and extends adaptive thinking and compaction guidance to Opus 4.8.
- Data: Claude API reference — TypeScript — Updates credential guidance for API keys, auth tokens, and `ant auth login`; adds beta mid-conversation system-message examples; and extends adaptive thinking and compaction guidance to Opus 4.8.
- Data: Claude model catalog — Adds Claude Opus 4.8 as the current most powerful Opus model with a 1M input window and updates Opus model-selection examples and legacy recommendations to prefer `claude-opus-4-8`.
- Data: HTTP error codes reference — Updates authentication fixes for OAuth bearer tokens and expands Opus model-specific 400 guidance to include Opus 4.8.
- Data: Managed Agents reference — Python — Updates client initialization examples to prefer environment, auth-token, or `ant auth login` credential resolution before explicit API-key injection.
- Data: Managed Agents reference — TypeScript — Updates client initialization examples to prefer environment, auth-token, or `ant auth login` credential resolution before explicit API-key injection.
- Data: Prompt Caching — Design & Optimization — Adds beta mid-conversation system-message guidance as a cache-preserving and prompt-injection-safe way to send operator instructions without editing the top-level system prompt.
- Data: Streaming reference — Python — Updates adaptive-thinking examples for Opus 4.8.
- Data: Streaming reference — TypeScript — Updates adaptive-thinking examples for Opus 4.8.
- Data: Tool use concepts — Updates adaptive-thinking examples for Opus 4.8.
- Skill: Agent Design Patterns — Replaces mid-session `<system-reminder>` guidance with beta `role: "system"` messages for supported models, with `<system-reminder>` retained as the fallback.
- Skill: Building LLM-powered applications with Claude — Adds Opus 4.8 to current model guidance, updates adaptive thinking, effort, task-budget, compaction, and migration recommendations, and documents beta mid-conversation operator instructions.
- Skill: Model migration guide — Adds Opus 4.8 migration guidance, including no new API breaking changes from Opus 4.7, model-ID updates, mid-session system prompts, long-horizon agentic tuning, effort recommendations, tool-triggering behavior, narration changes, ask-rate calibration, and visible-reasoning mitigation.
- System Prompt: Background session instructions — Changes temporary-file guidance from `$CLAUDE_JOB_DIR` to `$CLAUDE_JOB_DIR/tmp` for background sessions.
- System Prompt: Coordinator mode orchestration — Updates PR activity subscription guidance and changes worker summary accounting from total tokens to subagent tokens.
- Tool Description: AskUserQuestion — Tightens usage guidance so agents ask only when blocked on a decision that cannot be resolved from the request, code, or sensible defaults.
- Tool Description: Bash (sandbox — tmpdir) — Clarifies that `$TMPDIR` is set to the same sandbox-writable temporary directory for both sandboxed and unsandboxed commands.
- Tool Description: Workflow — Adds ultracode as standing workflow opt-in, requires inline workflow scripts for first invocation, clarifies JSON `args` passing, and notes that workflow scripts are plain JavaScript rather than TypeScript.
# [2.1.153](https://github.com/Piebald-AI/claude-code-system-prompts/commit/83b436e)
_+303 tokens_