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Reduce mix output noise (5-15% token savings) by installing rtk filters that compress mix test/credo/dialyzer/compile output before it reaches Claude.
Passed 15 of 18 test cases with the skill, and 4 of 18 without it.
and 10 more in the full report
13 fixed5 passed either way4 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 13 test cases the skill fixed. Same model, same prompt, with and without the skill.
I only made modifications to the `mix-test` filter in `.rtk/filters.toml`. What exact command tests only this specific filter's fixtures without running the entire suite?
| Checked | Without skill | With skill |
|---|---|---|
| Specifies running `rtk verify --filter mix-test` | Missed | Passed |
The instructions your model reads when the skill loads.
Mix commands (mix test, mix credo, mix dialyzer, mix compile) emit
verbose, repetitive output that consumes context fast. This skill installs
rtk — a CLI proxy that filters tool output
before it lands in the transcript.
The filters short-circuit happy paths to a single line (mix test: all pass)
while preserving full failure blocks, compile errors, and stack traces. Net win:
5-15% per-session token reduction on mix-heavy workflows.
/phx-work or /phx-full hitting context limits from mix output/phx-investigate retrying mix compile/mix test repeatedlymix dialyzer output dominates the transcript** (CompileError),
== Compilation error in), test failures (FAILURES, 0 failures — preserved
even on short-circuit), dialyzer warnings, and stack traces with file:line MUST
pass through unchangedrtk verify (or rtk verify --filter mix-test) to
confirm the bundled test fixtures pass before declaring success.rtk/filters.toml — diff and merge insteadwhich rtk && rtk --version
Read references/install.md if rtk is missing — covers
homebrew install + shell hook setup.
.rtk/filters.tomltest cases passed, vs 4 / 18 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.