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Session history search — INVOKE before planning, before web research, after errors, or when looking for past conversation content. Use INSTEAD of manually grepping .jsonl session files.
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
SOC 職業分類に基づく
Automatic tool discovery across 19 sources — INVOKE before planning, before adding dependencies, or when looking for tools to discover relevant skills, plugins, and MCP servers
Use after writing or editing a plan file, after exiting plan mode, or when asked "why did you choose this?" — surfaces decisions, risks, and blind spots before implementation.
Continuous learning — INVOKE after sessions with many errors or corrections to record patterns and improve rules, hooks, and skills
Cross-session memory - save insights after research, restore context at session start. Reduces re-exploration and prevents token waste.
File checkpoint and recovery — auto-quicksaves before destructive commands, INVOKE before implementing a plan or starting risky multi-file changes. Also use when user asks to undo changes or compare current state to a prior checkpoint.
Prompt rhetoric coach — deterministic scoring and restructuring using Anthropic best practices
| name | claude-historian |
| description | Session history search — INVOKE before planning, before web research, after errors, or when looking for past conversation content. Use INSTEAD of manually grepping .jsonl session files. |
| triggers | ["PreToolUse","PostToolUseFailure"] |
Session memory. Use INSTEAD of grepping .jsonl files manually. Checks past sessions before redundant research, planning, or debugging.
| Hook | When | Action |
|---|---|---|
| PreToolUse(WebSearch/WebFetch) | Before web research | Checks search(scope="similar") first |
| PostToolUseFailure(Bash/Edit) | After tool errors | Suggests search(scope="errors") |
| Command | Description |
|---|---|
/search-historian <query> | Search past sessions for solutions, decisions, context |
search(query, scope)One tool, many scopes:
| Scope | What It Finds | When to Use |
|---|---|---|
conversations | Full-text across all sessions | General search |
similar | Related past questions | Before web research |
errors | How errors were previously fixed | After tool failures |
plans | Past implementation plans | Before planning |
files | File changes across sessions (needs filepath) | Before editing familiar files |
tools | Successful tool workflows | Before launching agents |
sessions | Recent work sessions | Browse history |
config | .claude rules, skills, agents | Config troubleshooting |
tasks | Task management data | Check past tasks |
memories | Saved memories | Cross-session memory |
inspect(session_id)Deep summary of a specific session with key insights.
search(query="feature name", scope="plans")
search(query="topic", scope="similar")
If found: use past results, skip web search.
search(query="error message", scope="errors")
If found: apply previous solution.
search(query="topic", scope="conversations")
search(scope="files", filepath="path/to/file")
search(scope="sessions")