obelisk/SKILL.md

name, description, allowed-tools

name	description	allowed-tools
obelisk	Search and query past Claude Code session history. 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". 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. Memory: when the user says "记住这个", "remember this", "写入记忆", "save this conclusion", or when you determine a retrieval result contains a conclusion worth persisting.	Read Bash(node:*) Write

obelisk

Search and query Claude Code session history stored in ~/.claude/. Obelisk indexes sessions, messages, tool calls, tool results, summaries, subagents, workflows, workflow agents, parent chains, and raw JSONL lines into SQLite + FTS5.

Obelisk is a CodeAct memory layer: write a small JS query, run it locally, read the JSON, then answer. Do not turn history into a flat document or browse entire sessions by default.

Quick Start

The skill directory is provided as $SKILL_DIR at invocation time.

Fast keyword search:

node $SKILL_DIR/scripts/runtime.mjs --search "keyword"

Custom query:

1. Write a bounded JS query to a temp file, for example /tmp/q.mjs.

2. Run:

   node $SKILL_DIR/scripts/runtime.mjs --query /tmp/q.mjs
   

3. Parse JSON stdout and answer with concise evidence.

The query file runs inside (async () => { ... })(). Use return to emit JSON. Query scripts are read-only: remember() is not available, and sql() only accepts read-only SELECT/WITH queries.

Query Routing

Before writing a query, classify the task. Progressive disclosure is useful, but skipping the relevant reference usually costs extra query rounds.

• Read references/schema.md before raw sql() unless the needed table/column relationship is already explicit here. Do this before running the SQL, not after a missing-column error.
• Read references/retrieval-semantics.md before multi-step retrieval, scoped project/file/session searches, or synthesis/conclusion/history questions. It defines the query design frame.
• Read references/query-patterns.md when you need copyable query scripts: one-shot synthesis, learned detail passes, workflow trees, failure groups, file history, summaries, subagents, raw windows, or empty results.
• Read references/pitfalls.md after an error or when helper fields, FTS syntax, aliases, or row shapes are unclear.

If a helper row shape is unclear, first run a tiny scoped query and return Object.keys(row) or a compact sample. Do not invent field names.

Core API

search(text, opts?)

Full-text search across main messages, subagent messages, and workflow-agent messages.

Returns:

[{ message: { uuid, text, role, timestamp, model, cwd },
   session: { id, title, project, started_at },
   rank,
   context }]

context here means temporal neighbors: nearby messages in the same session by timestamp. It is not the parent chain. Use context(uuid) or trace(uuid) for causal/parent-chain context.

Opts: { limit, sessionId, project, after, before, cwd }.

project is a SQL LIKE filter over sessions.project, not an exact project identity. Results are already ordered by FTS5 rank; lower rank sorts earlier. Prefer returned order over manually interpreting numeric rank unless you are deliberately using FTS5 semantics.

context(uuid)

Returns the full story around one indexed message:

{ message, parentChain, session, subagent, workflow }

Use this after search() finds a promising message. It is the usual way to expand vertically from one evidence point without dumping the whole session.

sql(query, ...params)

Read-only SQL SELECT/WITH with ? placeholders. Returns array rows.

Before writing non-trivial SQL, read references/schema.md. Common safe joins:

• tool_calls does not have timestamps. Join messages m ON m.uuid = tc.message_uuid.
• tool_results does not have timestamps. Join messages m ON m.uuid = tr.message_uuid.
• For project/session filters, join sessions s ON s.id = <table>.session_id.
• Prefer SQL-side GROUP BY, COUNT, MAX, ORDER BY, and LIMIT over hand-counting in the final answer.

Tables: sessions, messages, tool_calls, tool_results, summaries, memories, subagents, workflows, workflow_agents, messages_fts.

Structured Helpers

These helpers are convenience accessors over the same SQLite structure. They do not replace sql(); use sql() when you need an exact aggregation or a join the helper does not expose.

All list helpers accept a bounded limit. Many also accept: { project, after, before, sessionId, sessions, branch }. Check the schema or a tiny sample before relying on less common filters.

• sessions(opts?) -- session rows, newest first. project is a SQL LIKE pattern.
• recent(n?) -- shorthand for recent sessions.
• summaries(opts?) -- summary rows, newest first: { id, session_id, timestamp, source, content, session_title, project }.
• subagents(opts?) -- subagent metadata plus messageCount.
• workflows(opts?) -- workflow runs, newest first.
• workflowTree(runId) -- workflow row plus parsed result and agents; may include bulky script and result_json, so project compact fields.
• fileHistory(filePath, opts?) -- Read/Edit/Write tool calls for a file, oldest first; includes many Read rows.
• failures(opts?) -- failed tool results with tool/session context, newest first.
• trace(uuid) -- parent chain from root to message.
• thread(sessionId) -- full session messages; last resort only.
• raw(uuid, opts?) -- windowed access to the original JSONL line.
• memories(opts?) -- recall memory layer, newest first. opts: { query, project, sessionId, sessions, after, before, branch, limit }. query filters summary/path by terms. Returns registered memory records (id, path, summary, project, session_id, created_at). Read the file at path for full content.

Retrieval Contract

Keep queries scoped, bounded, and structural.

• Scope First: classify the locator as scope, artifact, or semantic. Use the narrowest structural locator before FTS; empty scoped results are valid unless the user asks to broaden.
• Plan Before Probe: for conclusion, broad history, failure investigation, or file evolution, write a bounded retrieval script instead of spending turns on intermediate results.
• Structure Before Text: compute counts, joins, grouping, dedupe, and projection in SQL or JS; keep runtime JSON compact, ideally under 10k-12k chars for synthesis tasks.
• Evidence Before Conclusion: return compact evidence with stable IDs (session_id, uuid, tool_call_id, run_id, agent_id) and short snippets, then synthesize in the final answer.

If field, context, ordering, FTS, or helper semantics affect the query, read references/retrieval-semantics.md before coding. If a query errors, read references/pitfalls.md before retrying.

Memory Layer

Obelisk has a persistent memory layer alongside raw session data. Every retrieval queries both layers: memories() for prior conclusions, search() and helpers for raw session evidence. Use memory as prior notes, not final authority. If a memory record influences your answer, say naturally that it was previously recorded, and compare it with raw session evidence when correctness depends on it. Raw session data is the evidence layer, but one hit is not a complete truth; query and cite it compactly.

Recall: query memories({ query: 'topic terms', project: '...' }) to find prior conclusions relevant to the current task. Like other list helpers, passing a string is treated as sessionId, and passing a number is treated as limit. Read the file at path for full content.

Writing memories: after a retrieval produces a conclusion worth persisting, propose writing a memory file. The user must approve. Flow:

1. Write a markdown file using the Write tool (user approves).
2. Register it via remember() in a narrow memory-registration script:

return remember({
  path: '.obelisk/memories/design-decision-x.md',
  session_id: 'current-session-id',
  message_start: 'uuid-of-first-relevant-msg',
  message_end: 'uuid-of-last-relevant-msg',
  summary: 'Detailed summary: what was decided, why, what alternatives were considered, and what constraints drove the choice.'
})

Run the registration script with:

node $SKILL_DIR/scripts/runtime.mjs --remember /tmp/register-memory.mjs

--remember exposes only remember(). It does not expose search(), sql(), memories(), or other retrieval helpers. If you need source IDs, find them first with a normal --query script.

remember() validates that path already exists and points to a file. Relative paths are resolved against the source session's project_path when session_id is provided, then stored as normalized absolute paths. Prefer project-relative paths such as .obelisk/memories/... plus session_id.

summary should be detailed enough that memories() results alone can judge relevance without reading the file. Include the decision, the reasoning, and the key constraints — not just a title.

The message_start/message_end range marks where in the conversation this conclusion was drawn. Use it later to trace back to the original evidence.

Memory records survive index rebuilds. They are never auto-deleted.

Minimal Patterns

Search, then expand one promising hit:

const hits = search('auth fix', { limit: 5 });
if (!hits.length) return [];
return hits.slice(0, 3).map(h => ({
  session_id: h.session.id,
  session_title: h.session.title,
  uuid: h.message.uuid,
  snippet: h.message.text?.slice(0, 240),
}));

Check helper fields before assuming names:

const rows = summaries({ project: '%quiet-zero%', limit: 1 });
return rows.length ? Object.keys(rows[0]) : [];

Fetch message neighbors without a full thread:

const hit = search('runtime query', { limit: 1 })[0];
return sql(
  `SELECT uuid, role, timestamp, substr(text,1,240) AS snippet
   FROM messages
   WHERE session_id=? AND timestamp>=?
   ORDER BY timestamp LIMIT 6`,
  hit.session.id,
  hit.message.timestamp
);

See references/query-patterns.md for longer recipes.

Notes

• First run builds the index. Later runs update incrementally.
• DB location: ~/.claude/obelisk.sqlite.
• Query scripts run in a sandboxed VM with no filesystem or network access from inside the script.
• Indexed text and stored tool inputs/results are truncated to 10k chars. Use raw(uuid, { offset, limit }) for specific JSONL windows.