ReddRadar
Agent skill
claude-session-data-schema-reference
Claude Code session log schema — JSONL record types, message structure, tool call/result pairing, subagent file locations, team session layout, task/plan/team configuration paths. Use when parsing ~/.claude/projects/**/*.jsonl files, writing PostToolUse hooks that measure response sizes, building session analyzers, or any agent that reads or queries Claude session transcripts.
Install this agent skill to your Project
npx add-skill https://github.com/Jamie-BitFlight/claude_skills/tree/main/plugins/plugin-creator/skills/claude-session-data-schema-reference
SKILL.md
Claude Code Session Log Schema
Reference skill for the JSONL session log format written by Claude Code under ~/.claude/projects/.
All claims in the reference are sourced from direct JSONL file inspection and verified against the LM Assist TypeScript source. No fields are inferred.
When to Load
Load ./references/schema.md when you need:
- Directory structure and project-key encoding rules
- Complete record type discriminator (
system,user,assistant,result,progress,summary,file-history-snapshot) - Field-level schema for each record type
- Tool call / tool result pairing algorithm
- Subagent and team session file naming conventions
- Task, plan, and team configuration paths
- Hook integration — how
PostToolUsetool_responsemaps totool_result.content - What is NOT in the logs (per-tool token costs, streaming events, hook records, per-tool timing)
Source
Schema verified 2026-03-24. Source reference: ./references/schema.md.
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