cc-transcript 6.0.0

The Claude Code session-activity platform: a superset JSONL parser (Rust fast path, Python reference), typed tool calls with a cross-language content digest, turns/edits/evidence over one spine, context windows with labeled fidelity, unified decision and correction ledgers, LLM judging, and a transcript-investigation CLI.

cc-transcript

A non-lossy parser for Claude Code's on-disk JSONL transcripts, plus a CLI to investigate sessions.

cc-transcript parses Claude Code's JSONL transcripts into a typed superset event model — every entry type preserved, nothing dropped. The parser never silently discards sidechains, synthetic turns, tool results, or unrecognized entries; filtering is opt-in and lives in your code, not buried in the parser. It ships as a Python library, a uvx-runnable CLI, and a Claude Code plugin.

Install

uvx cc-transcript --help    # run the CLI

Quickstart

Discover the transcripts on disk, parse one, and walk the events:

import anyio

from cc_transcript import AssistantEvent, TranscriptDiscovery, UserEvent, parse_events_from_bytes

path = anyio.run(TranscriptDiscovery.find_transcripts)[0]
events = parse_events_from_bytes(path.read_bytes())

for event in events:
    match event:
        case UserEvent(text=text):
            print("user:", text[:80])
        case AssistantEvent(model=model, text=text):
            print(f"assistant ({model}):", text[:80])

Filtering is opt-in. Compose a spec from small builders and apply it — build_spec assembles clauses, apply_spec yields the survivors. NOISE_SPEC is a ready-made spec for universal structural noise (system reminders, local-command output, skill banners):

from cc_transcript import apply_spec, build_spec, keep_only, drop_junk, drop_short

spec = build_spec(keep_only("user", "assistant"), drop_junk("structural"), drop_short(2))
clean = list(apply_spec(events, spec))

CLI

Every command runs as uvx cc-transcript <command> ...; see --help on any command for its flags.

Command	What it does
list	Find transcripts on disk, newest first
stats	Summarize a session — counts, kinds, models, tools, token sizes, span
show	Render one compact line per event (--signal keeps the conversational spine)
grep	Search event content; hit indexes feed back into show --range
slice	Emit per-tool-call JSONL for a session UUID and time window (the bridge cc-review consumes)
digest	Generate and check the cross-language fixture corpus for the tool-digest contract

The output is compact by design — one line per event, hard truncation — so an agent triages a session in a few hundred tokens instead of paging through megabytes of JSONL:

$ uvx cc-transcript stats ~/.claude/projects/-Users-yasyf-Code-cc-transcript/4c77d556-8694-4613-8f50-253d905da68e.jsonl
files        1
events       181
kinds        other 68 · assistant 53 · user 33 · mode 22 · system 5
models       claude-fable-5 53
tools        TaskCreate 10 · Agent 5 · Read 5 · TaskUpdate 5 · Bash 2 · ToolSearch 2 · AskUserQuestion 1 · ExitPlanMode 1
text         14.8KB
thinking     8.7KB
tool io      89.0KB
sessions     1
span         2026-06-12 01:07:55 → 2026-06-12 02:28:03
interrupts   0
tool errors  0
sidechain    0

Claude Code plugin

Install the bundled plugin from inside Claude Code:

/plugin marketplace add yasyf/cc-transcript
/plugin install cc-transcript@cc-transcript

The plugin's skill teaches Claude to answer questions about its own history — "what did I ask yesterday", "find the session where we fixed the parser" — by funneling through the CLI's list, stats, grep, and show commands instead of reading raw JSONL.

How it works

The event model is a superset: sidechains, <synthetic> turns, thinking blocks, and unrecognized entry types all survive parsing, so you decide what to drop via composable filter specs. Two engines sit behind one Backend protocol — RustBackend (PyO3 + rayon) is the default fast path, PythonBackend is the readable reference, parity-asserted against each other. On top of the spine, SessionActivity lifts events into turns and typed tool calls, FileStateStore tracks per-file mtimes in SQLite for incremental re-parses, and cc_transcript.mining/judge/sentiment extract feedback, run LLM verdict passes, and score conversational sentiment. The docs site covers each of these in depth.

Docs

Each section of the docs site is a focused guide:

• Getting Started — install, parse, filter, persist.
• Filtering events — clauses, specs, and NOISE_SPEC.
• Scoring sentiment — the lexicon engine and score specs.
• Rust/Python backends & parity — the Backend protocol and parity testing.
• Compose your own policy — building a bespoke filtering policy.
• Mining feedback — detectors, confidence, candidates, and verdicts.
• The transcript CLI — list/show/grep/stats end to end.
• API reference — the complete typed surface.

License

PolyForm Noncommercial 1.0.0.