jamie-bitflight/claude-session-data-schema-reference
plugins/plugin-creator/skills/claude-session-data-schema-reference/SKILL.md
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 --global
skillsauthnpx skillsauth add jamie-bitflight/claude_skills claude-session-data-schema-referenceInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Apr 20, 2026, 7:05 AM19.9s2 files scanned
SKILL.md
- name:
- claude-session-data-schema-reference
- description:
- 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.
- user-invocable:
- false
- allowed-tools:
- Read
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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