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Review how the lean-ctx ctx_* MCP tools performed in the current session and file upstream issues for confirmed problems.
Passed 15 of 20 test cases with the skill, and 10 of 20 without it.
and 5 more in the full report
8 fixed10 passed either way4 still failing2 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 8 test cases the skill fixed. Same model, same prompt, with and without the skill.
We are running `python3 scripts/scan_session.py` to audit a session log. Which specific CLI flag should be passed to dump call number 14 in full detail?
| Checked | Without skill | With skill |
|---|---|---|
| Uses the -d flag with parameter 14 to dump the specific call details. | Missed | Passed |
The instructions your model reads when the skill loads.
Upstream repo: yvgude/lean-ctx (https://github.com/yvgude/lean-ctx).
Reads a Claude Code session transcript, so it applies to agents that write
~/.claude/projects/*/*.jsonl. Other harnesses need their own extractor; the
triage rules below are harness-independent.
Run from this skill's directory (needs python3):
python3 scripts/scan_session.py
Defaults to the newest transcript under ~/.claude/projects/*/ — the live
Claude Code session. Pass a path to review a different one. -d N dumps call
#N in full.
The script reports facts, not verdicts: every ctx_* call in order, which
results the harness flagged is_error, which calls repeated identical
arguments, which asked for raw/fresh output, and how many native
Read/Grep/Bash calls happened. It deliberately does not guess which of
those is a problem — that judgment is yours, below.
Transcripts run to megabytes, so read the table, not the raw JSONL.
Start from is_error. In practice every genuine tool failure carries it.
Then read the call list for the softer signals: identical retries, raw/fresh
re-reads, native calls clustered right after a ctx_* call, or a sequence that
only completed once ctx_* was abandoned.
Skipping them is how this review returns a false "nothing to report". Both cost one command each.
test cases passed, vs 10 / 20 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.