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CI timing analysis · julialang | DecimalAI

devopsby julialang

CI timing analysis

julialang/ci-timing

Source julialang/julia ↗License MIT

Compare a Julia PR's Buildkite job durations against recent CI history (per-job mean/min/max over the last N days).

SkillScore84Maintained

Automatic

DevOps & SRE pack

Last verified 9/27/2026

What it changes

Passed 16 of 19 test cases with the skill, and 8 of 19 without it.

Without skill44%

With skill84%

Checks it passed that the model alone missed

Recommends using --min-seconds 120
Clarifies that no Buildkite API token is required
Applies --min-seconds 120 to filter short noise jobs

and 10 more in the full report

11 fixed10 passed either way3 still failing1 broke

Pass-rate lift: +40 pp
Tokens: -48%
Agent turns: 0%
Response time: -67%

Model gemini-3.6-flashMeasured 9/27/2026v121 of 25 cases passed with skill · 19 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/julialang-ci-timing/SKILL.md https://app.decimal.ai/s/julialang-ci-timing/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add julialang-ci-timing, 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/julialang-ci-timing/ and pins it in .decimal/skills.lock

decimalai skills add julialang-ci-timing

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

curl -fsSL --create-dirs -o .claude/skills/julialang-ci-timing/SKILL.md https://app.decimal.ai/s/julialang-ci-timing/SKILL.md

Raw file: /s/julialang-ci-timing/SKILL.md ↗ · machine-readable summary at /s/julialang-ci-timing.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 8 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 8

Prompt

In what default order are CI jobs listed in the markdown table produced by contrib/ci-timing/ci_timing_compare.jl?

What was checked, without and with the skill
Checked	Without skill	With skill
States that the table orders jobs starting with the slowest job first	Missed	Passed

case-20 · gemini-3.6-flash · 9/27/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md26 linessingle file

CI timing analysis

julia --startup-file=no --project=contrib/ci-timing contrib/ci-timing/ci_timing_compare.jl <PR-number>

Prints a markdown table, slowest job first, plus a TOTAL row: each job's duration in the PR's julia-pr build vs. the mean/min/max of the same job name over the last 7 days of julia-ci-timing history. ⚠️ = above the weekly max, ✅ = below the weekly min. No Buildkite token needed; gh is only needed to turn a PR number into a build.

Flags: --build julia-pr/853, --days N, --include-failed, --min-seconds N (hides short jobs).

Caveats when reading it:

One build vs. a week of samples — anything inside the min/max band is agent variance, and even ⚠️/✅ rows need a second build to mean anything.
juliasyntax/Launch * jobs are seconds long, so their percentages are noise; --min-seconds 120 drops them.
A fleet-wide shift in one direction skews TOTAL and is not a PR effect.
Broken (never run), running, and superseded retry jobs are excluded; a failed job's time is cut short or stretched by the failure.

For logs behind a slow or failed job, see the buildkite-logs skill.

Track record

Benchmark

16 / 19

test cases passed, vs 8 / 19 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

julialang / julia

doc/src/devdocs/agents/skills/ci-timing/SKILL.md

View on GitHub ↗

License MITImported 8/31/2026Version v1

More skills from the same source and nearby in the registry, with their headline benchmark lift.

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See it in action

What's inside

CI timing analysis

Track record

Benchmark

Adoption

SkillSafety

Source

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