medicine-wheel

medicine-wheel-session-reader

Session event reader for the Medicine Wheel Developer Suite — JSONL parsing, session summaries, analytics extraction, and search across agent session data.

Overview

This package reads agent session event data from _sessiondata/ JSONL files. Zero external dependencies — only uses Node.js built-ins.

What it provides

Module	Description
sessions	Session listing, detail retrieval, search, and utility functions
types	TypeScript type definitions and constants for session events

Installation

npm install medicine-wheel-session-reader

Or link locally:

npm link ../medicine-wheel/src/session-reader

Usage

import {
  // Session operations
  listSessions,
  getSessionDetail,
  getSessionSummary,
  getSessionEvents,
  searchSessions,
  readSessionFile,
  getLatestEvents,
  getDistinctModels,

  // Types
  type SessionEvent,
  type SessionAnalytics,
  type SessionSummary,
  type SessionFilters,

  // Constants
  EVENT_ICONS,
} from 'medicine-wheel-session-reader';

Sub-path exports

import type { SessionEvent, SessionFilters } from 'medicine-wheel-session-reader/types';
import { listSessions, searchSessions } from 'medicine-wheel-session-reader/sessions';

API Reference

Session listing

listSessions(filters?) — List sessions from _sessiondata/ directories with optional filters.

const sessions = await listSessions({ model: 'claude-sonnet-4-20250514' });
const recent = await listSessions({ since: '2025-01-01', minEvents: 5 });

Session detail

getSessionDetail(sessionId) — Full session detail including events and analytics.

const detail = await getSessionDetail(sessions[0].id);
console.log(detail.analytics.toolUsage);

getSessionSummary(sessionId) — Summary metadata for a single session.

getSessionEvents(sessionId) — Raw event array for a session.

Search

searchSessions(query) — Full-text search across session data.

const results = await searchSessions('authentication');

Utilities

readSessionFile(filePath) — Parse a single JSONL session file into events.

getLatestEvents(count?) — Retrieve the most recent events across all sessions.

getDistinctModels() — List all unique model identifiers found in session data.

Types

interface SessionEvent {
  session_id?: string;
  hook_event_name?: string;
  timestamp?: string;
  model?: string;
  tool_name?: string;
  prompt?: string;
  // ... extensible with [key: string]: unknown
}

interface SessionAnalytics {
  toolUsage: Record<string, number>;
  filesEdited: string[];
  promptCount: number;
  toolCallCount: number;
  errorCount: number;
  // ...
}

interface SessionSummary {
  id: string;
  model?: string;
  startedAt?: string;
  endedAt?: string;
  eventCount: number;
  analytics?: SessionAnalytics;
  // ...
}

interface SessionFilters {
  model?: string;
  hasTranscript?: boolean;
  minEvents?: number;
  maxEvents?: number;
  since?: string;
  until?: string;
}

Constants

EVENT_ICONS — Emoji map for session event types (e.g., SessionStart → 🚀, PreToolUse → 🔧, SessionEnd → 🏁).

License

MIT — IAIP Collaborative, Shawinigan, QC

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