build(obelisk): let Claude Code search its own session history
- SQLite + FTS5 index over ~/.claude JSONL transcripts. - Agent writes JS queries at runtime — same sandbox pattern as workflows. - Covers sessions, subagents, workflow executions, tool calls, and full-text search.
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tommy0103
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---
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name: obelisk
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description: >
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Search and query past Claude Code session history.
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Reactive: when the user asks "how did I fix X", "what did we do last time", "find the session where", "上次怎么修的", "之前的session", "历史记录".
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Proactive: when the user references past work you lack context for, when you're about to modify a file with complex edit history, when the user says "继续之前的" or "continue where we left off", or when understanding prior decisions would improve your current response.
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allowed-tools:
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- Read
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- Bash(node:*)
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- Write
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---
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# obelisk
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Searches and queries your Claude Code session history stored in `~/.claude/`.
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A SQLite index with FTS5 full-text search covers all sessions, subagent conversations, and workflow agent runs.
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You write JS query snippets that run in a sandboxed VM against the indexed data, then parse the JSON output.
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## Quick Start
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The base directory for this skill is provided as `$SKILL_DIR` at invocation time (shown as "Base directory for this skill: ...").
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**Fast keyword search** (no script needed):
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```bash
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node $SKILL_DIR/scripts/runtime.mjs --search "keyword"
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```
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**Custom query** (write a JS snippet, run it):
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1. Write a query to a temp file (e.g. `/tmp/q.mjs`)
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2. Run: `node $SKILL_DIR/scripts/runtime.mjs --query /tmp/q.mjs`
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3. Parse the JSON stdout and answer the user
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The query file body is executed inside `(async () => { ... })()` with the API below available as globals. The last expression is returned as JSON. Use `return` to emit results.
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## API
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### search(text, opts?)
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Full-text search across all messages (user, assistant, subagent, workflow agent).
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Returns: `[{ message: {uuid, text, role, timestamp, model}, session: {id, title, project, started_at}, context: [...surrounding messages] }]`
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opts: `{ limit, sessionId, project, after, before }`
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### context(uuid)
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Full story around a message: the message itself, parent chain, session info, subagent/workflow metadata.
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Returns: `{ message, parentChain, session, subagent, workflow }`
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### recent(n?)
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Latest n sessions (default 10). Returns session rows with title, project, started_at, ended_at.
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### sql(query, ...params)
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Raw SQL. Use `?` placeholders. Returns array of row objects.
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Tables: `sessions`, `messages`, `tool_calls`, `tool_results`, `subagents`, `workflows`, `workflow_agents`, `messages_fts`
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### Other APIs
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- `trace(uuid)` -- full parent chain from root to message
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- `thread(sessionId)` -- all messages in a session, ordered by time
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- `subagents(sessionId)` -- subagent metadata + message counts
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- `workflows(sessionId?)` -- workflow runs (all if no sessionId)
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- `workflowTree(runId)` -- workflow + its agents + all their messages
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- `fileHistory(filePath)` -- every Edit/Write/Read on a file across sessions
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- `failures(sessionId?)` -- tool calls that returned errors, with surrounding context
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## Examples
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### "上次怎么修 auth 的"
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```js
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const hits = search('auth fix')
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return hits.slice(0, 5).map(h => ({
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session: h.session.title,
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date: h.session.started_at,
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message: h.message.text?.slice(0, 200)
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}))
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```
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### "最近在做什么"
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```js
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return recent(10).map(s => ({ title: s.title, project: s.project, date: s.started_at }))
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```
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### "哪些文件被反复修改"
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```js
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return sql(`
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SELECT file_path, COUNT(*) as n FROM tool_calls
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WHERE name IN ('Edit','Write') AND file_path IS NOT NULL
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GROUP BY file_path HAVING n > 3 ORDER BY n DESC LIMIT 20
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`)
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```
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### "那个 review workflow 的结果是什么"
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```js
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const wfs = workflows()
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const review = wfs.find(w =>
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w.run_id.includes('review') ||
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JSON.parse(w.result_json || '{}').synthesis
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)
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return review ? JSON.parse(review.result_json) : 'No review workflow found'
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```
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### "上次跑 experiment 用了多少 token"
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```js
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const hits = search('experiment')
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if (!hits.length) return 'No experiment sessions found'
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const sid = hits[0].session.id
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return sql('SELECT SUM(input_tokens) as input, SUM(output_tokens) as output FROM messages WHERE session_id = ?', sid)
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```
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### "追踪一下那个决策是怎么做的"
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```js
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const hits = search('the decision query here')
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if (!hits.length) return 'Nothing found'
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return context(hits[0].message.uuid)
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```
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## Notes
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- First run builds the index (~5s for ~100 sessions). Subsequent runs are incremental.
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- DB location: `~/.claude/obelisk.sqlite`
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- Subagent and workflow agent conversations are fully indexed and searchable.
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- Query scripts run in a sandboxed VM context -- no file system or network access from inside scripts.
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- Text is truncated to 10k chars per message during indexing.
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- FTS5 search supports standard SQLite FTS syntax: `"exact phrase"`, `term1 AND term2`, `term1 OR term2`, `term1 NOT term2`.
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