Every past session, subagent, and workflow — searchable in natural language.

Ask in plain language. The agent writes the query, runs it, answers.

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What you can ask

/obelisk 上次那个 auth 的 bug 我怎么修的
/obelisk 哪些文件这周被反复修改
/obelisk 最近 workflow 跑出来什么结果
/obelisk 我让 subagent 做过哪些代码 review

Anything Claude Code has done before — sessions, tool calls, subagents, workflows — is indexed and searchable. Ask in your own words.

Install

npx skills add tommy0103/obelisk

Or manually: copy obelisk/ into your project's .claude/skills/.

Then in any Claude Code session:

/obelisk <your question>

First run builds the index (~5 seconds for 100 sessions). After that it rebuilds incrementally.

Requires

• Node.js 22+ (uses built-in node:sqlite with FTS5)
• Claude Code with skills support.

What gets indexed

Layer	Source	What's captured
Sessions	<project>/<sessionId>.jsonl	Title, project, timestamps, git branch
Messages	user + assistant turns	Full text, model, token usage, parent chain
Tool calls	every tool invocation	Tool name, input, file paths touched
Subagents	subagents/agent-<id>.jsonl	Agent type, description, full conversation
Workflows	workflows/wf_<runId>.json	Script, structured result, agent count
Workflow agents	subagents/workflows/wf_<runId>/	Per-agent transcripts linked to workflow

Full-text search via FTS5 covers all message text across every layer.

How it works

You ask a question
  ↓
Agent writes a JS query against the SQLite index
  ↓
Runs it via node runtime.mjs --query <script>
  ↓
Reads the JSON result, answers you in natural language

The core idea: don't design a query DSL — let the agent write code. An agent that can write workflow scripts can also write query scripts. Same sandbox, same mental model.

The agent has a two-tier API. Most questions only need the simple layer:

Simple API — taught directly in the skill prompt:

• search(text) — FTS5 full-text search, returns matches with surrounding context
• context(uuid) — full story around a message (parent chain, subagent/workflow metadata)
• sql(query, ...params) — raw SQL for anything else

Advanced API — agent reads references/schema.md on demand:

• trace() · thread() · subagents() · workflows() · workflowTree() · fileHistory() · failures() · recent()

The design is progressive disclosure: the agent doesn't see the full schema until it needs it.

Structure

.claude/skills/obelisk/
├── SKILL.md              # Skill definition + simple API + examples
├── scripts/
│   └── runtime.mjs       # Indexer + query runtime (400 lines, zero deps)
└── references/
    └── schema.md          # Full table schema + advanced API + query patterns

Design

The index rebuilds incrementally — only new or modified JSONL files are re-parsed.

Zero npm dependencies. Uses Node 22's built-in node:sqlite with FTS5. The entire runtime is ~400 lines.

20K lines of scattered JSONL → something the agent can search() and sql() against in milliseconds.

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License

MIT @tommy0103