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claude-session-introspect

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Inspect Claude Code session JSONL files at ~/.claude/projects/ to extract real conversation telemetry: token counts (input/output/cache reads/cache writes), assistant turn counts, human prompt counts, tool-use counts, compaction boundaries, and the contents of compaction summaries. Use this skill when the user asks "how many tokens did this session use", "how many prompts have I sent", "show me the stats for this conversation", "what got compacted", "where are the compaction boundaries", "introspect the session", "do brain surgery on the JSONL", or wants any data point that lives inside the on-disk session log rather than the live context window. Inspired by Tal Raviv's "I wanted to know how compaction works" article.

claude-session-introspect/SKILL.md

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Nov 9, 2026
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MIT

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# Claude Session Introspect

Claude Code persists every conversation as a JSONL file on disk. This skill is the recipe for opening one and pulling out the numbers you actually want — token usage, prompt counts, compaction events, tool calls — without guessing.

## Where sessions live

```
~/.claude/projects/<encoded-cwd>/<session-uuid>.jsonl
```

`<encoded-cwd>` is the absolute path of the project's working directory with `/` replaced by `-` and a leading `-`. Example: `/Users/swyx/Work/foo` → `-Users-swyx-Work-foo`.

Each line is one event. The interesting `type` values:
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