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Upgrade Browser · flutter | DecimalAI

testingby flutter

Upgrade Browser

flutter/upgrade-browser

Source flutter/flutter ↗License BSD-3-Clause

Upgrade browser versions (Chrome or Firefox) in the Flutter Web Engine and/or Framework tests.

SkillScore39Maintained

Automatic

DevOps & SRE pack

Last verified 9/27/2026

What it changes

Passed 6 of 15 test cases with the skill, and 2 of 15 without it.

Without skill13%

With skill39%

Checks it passed that the model alone missed

Prescribes running dev/felt generate-builder-json.
Refers uncertain users to contact #hackers-infra on Discord.
Clarifies that Firefox dependencies are omitted from .ci.yaml.

and 10 more in the full report

7 fixed2 passed either way13 still failing1 broke

Pass-rate lift: +26 pp
Tokens: -5%
Agent turns: 0%
Response time: -59%

Model gemini-3.6-flashMeasured 9/27/2026v19 of 23 cases passed with skill · 15 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/flutter-upgrade-browser/SKILL.md https://app.decimal.ai/s/flutter-upgrade-browser/SKILL.md

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

decimalai skills add flutter-upgrade-browser

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

curl -fsSL --create-dirs -o .claude/skills/flutter-upgrade-browser/SKILL.md https://app.decimal.ai/s/flutter-upgrade-browser/SKILL.md

Raw file: /s/flutter-upgrade-browser/SKILL.md ↗ · machine-readable summary at /s/flutter-upgrade-browser.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 7 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 7

Prompt

I tried checking Firefox version 131.0 and the fetch_versions tool returned false. Should I immediately edit package_lock.yaml or stop?

What was checked, without and with the skill
Checked	Without skill	With skill
Advises stopping the workflow when version verification returns false.	Passed	Passed
Permits proceeding only if the user explicitly confirms overriding the failed verification.	Missed	Passed

case-10 · 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.md107 lines2 filesincludes scripts

Upgrade Browser

This skill automates the process of upgrading Chrome and Firefox versions in the Flutter Web Engine and the Framework tests.

Workflow

1. Identify and Verify the New Version

Before updating any files, find and verify the existence of the version you want to use.

To find the latest stable version:

dart scripts/fetch_versions.dart latest <chrome|firefox>

To verify a specific version exists:
```
dart scripts/fetch_versions.dart verify <chrome|firefox> <version>
```
This command will return true or false.

Verification Rules:

Enforced by default: If the command returns false, do not proceed.
Optional if requested: If the user explicitly asks to skip verification (e.g., "Upgrade to version X without verification"), you may skip this step.
Failed verification: If verification fails but the user confirms they want to proceed anyway, you may continue.

2. Update Local Files

The user may request to upgrade one or both locations. They may also use different versions for each location.

Flutter Web Engine (`engine/src/flutter/lib/web_ui/dev/package_lock.yaml`)

Update the version field for chrome or firefox.

chrome:
  version: 'NEW_VERSION'

firefox:
  version: 'NEW_VERSION'

Track record

Benchmark

6 / 15

test cases passed, vs 2 / 15 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

flutter / flutter

.agents/skills/upgrade-browser/SKILL.md

View on GitHub ↗

License BSD-3-ClauseImported 8/31/2026Version v1Bundled 1 file · scripts

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

Ready to supercharge your AI agents?

See it in action

What's inside

Upgrade Browser

Workflow

1. Identify and Verify the New Version

2. Update Local Files

Flutter Web Engine (engine/src/flutter/lib/web_ui/dev/package_lock.yaml)

Track record

Benchmark

Adoption

SkillSafety

Source

Related skills

Flutter Web Engine (`engine/src/flutter/lib/web_ui/dev/package_lock.yaml`)