codingby fallow-rs

Binary size loop

fallow-rs/binary-loop

Source fallow-rs/fallow ↗License MIT

Iteratively reduce Fallow binary size using cargo-bloat and release-build measurements while preserving features, performance, and compatibility.

SkillScore86Maintained

Automatic

Coding pack

Last verified 9/28/2026

What it changes

Passed 16 of 18 test cases with the skill, and 13 of 18 without it.

Without skill73%

With skill86%

Checks it passed that the model alone missed

runs review after loop completion
specifies running review as the final step
requires rebuilding with identical release settings

and 1 more in the full report

3 fixed16 passed either way3 still failing0 broke

Pass-rate lift: +14 pp
Tokens: -46%
Agent turns: 0%
Response time: -46%

Model gemini-3.6-flashMeasured 9/28/2026v219 of 22 cases passed with skill · 18 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/fallow-rs-binary-loop/SKILL.md https://app.decimal.ai/s/fallow-rs-binary-loop/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add fallow-rs-binary-loop, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/fallow-rs-binary-loop/ and pins it in .decimal/skills.lock

decimalai skills add fallow-rs-binary-loop

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/fallow-rs-binary-loop/SKILL.md https://app.decimal.ai/s/fallow-rs-binary-loop/SKILL.md

Raw file: /s/fallow-rs-binary-loop/SKILL.md ↗ · machine-readable summary at /s/fallow-rs-binary-loop.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 2 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 2

Prompt

In our `image-filter` Rust crate, analysis shows generic instantiations in `transform_matrix<T>`, large dependency size from `serde_json`, and verbose debug logging. Should we refactor generics, disable default features on `serde_json`, and strip logging all in one pull request, or handle them differently during our size reduction workflow?

What was checked, without and with the skill
Checked	Without skill	With skill
requires selecting one contributor to modify per iteration	Missed	Passed
requires rebuilding with identical release settings	Missed	Passed

case-07 · gemini-3.6-flash · 9/28/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md13 linessingle file

Binary size loop

Measure the release binary and capture cargo-bloat evidence.
Select one dependency, monomorphization, feature, or codegen contributor.
Implement a bounded change.
Rebuild with identical release settings.
Keep the change only when size improves and verification passes.
Repeat until the target is met or remaining candidates have poor tradeoffs.
Run review.

Do not trade away supported targets or public behavior without explicit scope.

Track record

Benchmark

16 / 18

test cases passed, vs 13 / 18 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v5 — 8/31/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

fallow-rs / fallow

.agents/skills/binary-loop/SKILL.md

View on GitHub ↗

License MITImported 8/31/2026Version v2

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See it in action

What's inside

Binary size loop

Track record

Benchmark

Adoption

SkillSafety

Source

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See it in action

What's inside

Binary size loop

Track record

Benchmark

Adoption

SkillSafety

Source

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