A set of skills for Kotlin, Jetpack Compose, Android development, and grounded writing.

The repository is also a portable Agent Plugins v1.0.0 package. Conforming clients discover the root plugin.json and the immediate skill directories under skills/.

Install

With the skills CLI:

npx skills add chrisbanes/skills

Or install as a Claude Code plugin:

/plugin marketplace add chrisbanes/skills
/plugin install chrisbanes-skills@chrisbanes-skills

Or install as a Codex plugin:

codex plugin marketplace add chrisbanes/skills --ref main
codex plugin add chrisbanes-skills@chrisbanes-skills

Or install as an OpenCode V2 plugin (2.0.22 or newer):

{
  "plugins": ["chrisbanes-skills@git+https://github.com/chrisbanes/skills.git"]
}

OpenCode V1 1.18.29 or newer uses plugin instead of plugins. See .opencode/INSTALL.md for details.

External skill providers

Most skills in this repository are self-contained. The workflows below compose with skills from other repositories; installing chrisbanes/skills does not install them, and the workflows never install them implicitly.

Consumer	Requirement	Provider	Source and install
deliver-spec GitHub readiness	Conditional	triage	Matt Pocock's skills: npx skills add mattpocock/skills --skill triage
implement-with-subagents behavior tasks	Conditional	tdd at approved test seams	Matt Pocock's skills: npx skills add mattpocock/skills --skill tdd
run-github-project explicit/repository-required test-first work	Conditional	tdd	Matt Pocock's skills: npx skills add mattpocock/skills --skill tdd
run-github-project Todo triage	Conditional	triage	Matt Pocock's skills: npx skills add mattpocock/skills --skill triage
run-github-project Wayfinder lane	Conditional	wayfinder, research	Matt Pocock's skills: use --skill wayfinder or --skill research; see the workflow provider matrix

Delivery and parallel implementation use one fresh independent read-only reviewer against the approved source and repository standards; no external review skill or issue-tracker setup is required. Reviews include the production paths and boundary cases examined and material uncertainty. The authoritative behavioral review and repair procedure covers related boundary repairs, sensitive fixture calibration before expansion, rendering-consumer tracing, repeated external findings and browser diagnostics. npm run references:sync supplies identical local copies to its consumers; edit the authoritative source, not the copies. The same mechanism supplies to-plan's boundary-validation rule to implementation consumers.

Delivery and planning select affected existing tests through shared-structure consumers and structural audits. Unsettled fixtures establish one sensitive case before expanding the acceptance matrix; established fixtures reuse valid evidence.

Review mode in implement-with-subagents, and review or setup mode in run-github-project, do not require these external skills. See the run-github-project provider matrix for its lane-specific fallback and blocking behavior.

Skills

Start here

• Working on Compose state or effects? Start with compose-state-and-effects.
• Investigating recomposition, stability, or jank? Start with compose-performance.
• Comparing Android benchmark configurations or a measured Android default? Start with android-benchmark-comparison.
• Reviewing Flow or coroutine architecture? Start with kotlin-concurrency-and-flow.

Routing

• using-chrisbanes-skills — route Kotlin and Jetpack Compose work to focused skills, adding a second only for an independent decision in the same change.

Benchmarking

• android-benchmark-comparison — compare physical Android benchmark configurations with verified coverage, controlled conditions, trace-backed diagnosis of unstable rankings, and bounded conclusions.

Jetpack Compose

State and side effects

• compose-state-and-effects — decide state ownership and effect lifecycle for local UI state, screen state holders, Flow collection, callbacks, cleanup, navigation, snackbar, analytics, and focus requests.

Performance

• compose-performance — diagnose stability, deferred reads, composition contracts, and cross-phase back-writing from concrete runtime evidence.

UI API design and layout

• compose-component-design — design caller-placeable Compose APIs whose variable visual regions are caller-provided slots.
• compose-animations — choose Compose animation APIs for visibility, value targets, coordinated transitions, and content swaps; align with official quick guide and decision tree.
• compose-focus-navigation — design and test keyboard, TV, D-pad, and focus-first Compose navigation behavior.

Testing

• compose-ui-testing-patterns — choose between plain UI tests, semantics assertions, key/focus tests, interaction state tests with MutableInteractionSource, screenshot tests, and integration tests.

Kotlin

• kotlin-concurrency-and-flow — review coroutine, raw Thread, and Executor ownership, cancellation, Flow state/event modeling, sharing, replay, and one-shot delivery.
• kotlin-control-flow — write and review Kotlin branching with subject when, guard conditions, sealed exhaustiveness, smart casts, nullable branching, and early returns.
• kotlin-api-design — choose function owners, semantic domain types, and Kotlin Multiplatform platform boundaries.

Writing

• grounded-writing — draft or review public developer documentation and other user-owned text using Chris Banes’s writing as the sole style model, including internal report reviews, while preserving evidence, format, review-only authority, and material-edit restraint.

Workflows

• deliver-spec — coordinate one approved spec or verified Project-controller handoff through solo or justified delegated implementation, a planning-free fast path for small well-understood tickets, CI-supplied full-suite evidence, concurrent external review with verified draft support or earlier PR readiness, reusable scope approval and evidence, independent integrated-candidate review and focused repair review, and PR shepherding; validate applicable live-qualification harness paths offline (isolated production stores for persistent paths, fake runtimes for asynchronous paths), then reconcile failures under bounded approved allowances.
• release-kotlin-library — assess readiness, prepare, and verify Kotlin library releases; check the gradle-maven-publish-plugin prerequisite, reconcile changelogs and Metalava API snapshots, and follow repository checks and publication gates.
• gradle-run — run every agent-initiated Gradle command through a compact-output wrapper; recover run identity and bounded results by workflow ID with read-only status, and diagnose failures with optional investigation helpers.
• implement-with-subagents — coordinate one or more worker-owned implementation tasks through dependency-aware dispatch, task acceptance, integration, and same-owner repair; dispatch independent ready work concurrently within actual capacity, reuse sequential worker slots, and support read-only orchestration review.
• to-plan — create risk-scaled implementation plans that prove baselines from green CI, with observable slices and consequential boundary validation before dependent work, plus authenticated integration amendments and explicit consumer handoffs; decide separate PRs by coherent deliverable boundaries.
• run-github-project — set up, review, or operate a repository's GitHub Project workflow with current-column authorization, human-only Backlog promotion, and deterministic configured agent selection; deliver ordinary implementation tickets through deliver-spec, resolve run-level merging once at startup with a 60-second default-no question unless already specified, preflight offline live-qualification harness evidence, preserve asynchronous or persistent failures in durable checkpoints, prioritize active delivery through safe planner checkpoints, fast-path small Todo tickets straight into implementation, start external review while CI runs after local qualification, free slots while reviewed PRs wait on CI, record ticket-local pauses while independent work continues, and keep drain alive under a read-only Project Watcher instead of returning at the first human wait.
• shepherd — autonomously poll open PRs and MRs, or follow a host PR monitor's wake events (such as Claude desktop's Auto-fix) instead of polling, triage review comments, and repair CI failures with affected checks and required integrated-candidate validation; start external review during CI while retaining final-head merge gates.

Workflows that delegate agents share the subagent selection and handoff reference. Each workflow retains its own delegation trigger, authority, and acceptance rules. Each consuming skill also contains a copy of the reference for standalone installation. deliver-spec bundles its own solo-or-delegated implementation procedure; implement-with-subagents retains its explicitly delegated workflow.

Planning and drain admission distinguish behavioral prerequisites, shared-file mutation conflicts and final integration requirements. Plan-proven independent preparation needs explicit slice ownership, permitted paths/resources, focused checks and a stop before shared edits; native blockers, accepted-plan ordering, resource grants and final integrated validation still apply.

Edit references/subagent-selection.md, then run npm run references:sync and include the updated bundled copies in the change. Run npm run build to check that all copies are regular files matching their sources; it fails on drift without rewriting files.

Migration from pre-cluster skills

This is a breaking taxonomy change. Replace the removed entrypoints as follows:

Removed skills	Replacement
compose-state-authoring, compose-state-hoisting, compose-side-effects	compose-state-and-effects
compose-recomposition-performance, compose-stability-diagnostics, compose-state-deferred-reads	compose-performance
compose-modifier-and-layout-style, compose-slot-api-pattern	compose-component-design
kotlin-coroutines-structured-concurrency, kotlin-flow-state-event-modeling	kotlin-concurrency-and-flow
kotlin-functions, kotlin-types-value-class, kotlin-multiplatform-expect-actual	kotlin-api-design

Contributing

Skills live at skills/<skill-name>/SKILL.md, flat (no language nesting). The name: in the SKILL.md frontmatter must match the directory name.

Frontmatter is validated against skills.schema.json, which tracks the core Agent Skills specification and permits disable-model-invocation for Claude Code compatibility. name and description are required; portable optional fields are license, compatibility, metadata, and allowed-tools. Explicit-only workflow skills also mirror that policy in Codex's agents/openai.yaml.

Releases

Release versions use CalVer: YYYY.M.D, YYYY.M.D.N, or YYYY.M.D.NN, without zero-padded month or day values. For example, use 2026.6.17 for the first release of the day and 2026.6.17.1 or 2026.6.17.01 for another release. Single-digit daily release numbers are normalized to the padded form, so both inputs produce 2026.6.17.01.

Keep root plugin.json, .claude-plugin/plugin.json, .codex-plugin/plugin.json, and new Git release tags on the same version. Existing zero-padded tags from before this policy map to the non-padded manifest version, so 2026.06.16 maps to 2026.6.16. Only bump versions when publishing an installable release.

To publish a release, run the Release workflow from GitHub Actions. Leave the version input empty to choose today's next unused UTC version, or provide a specific CalVer value, optionally with a one- or two-digit daily release number. Use the dry-run option to validate without creating a commit, tag, or GitHub release. Automatic numbering checks existing tags and releases: the first release uses YYYY.M.D, then subsequent releases increment the highest daily suffix through .99. Gaps are not reused. If all daily numbers are exhausted, the workflow fails and requires an explicit version or a release on another day.

The same workflow also runs nightly (02:17 UTC). It releases only if skills/, the plugin manifests, .opencode/, .agents/, plugin.json, or package.json changed since the latest tag; otherwise it exits without a release.

Before pushing, lint skills (frontmatter schema + markdown):

npm install
npm run lint

This also runs on CI for all PRs.

For a taxonomy change, also run the durable cluster behavior evaluation. It checks routing, required references, safeguards, exceptions, and finish gates at the public agent-facing seam.

Before publishing a release, manually run the advisory evaluations for the changed skills. Select each affected suite; when shared evaluation machinery changes, include every suite affected by that change. Preview each suite with the intended filters and current subject and judge cost assumptions:

python3 evals/run.py plan \
  --suite <suite> \
  --skill <changed-skill> \
  --model <model> \
  --reasoning <effort> \
  --judge-model <judge-model> \
  --judge-reasoning <effort> \
  --subject-cost-per-call-usd <amount> \
  --judge-cost-per-call-usd <amount> \
  --json

Repeat --skill for each changed skill. Without a --case filter, omitting --skill selects all non-calibration cases in the suite. Calibration cases are excluded unless you pass their explicit IDs with --case. Inspect case_ids in the JSON output and confirm the selected cases match the intended scope before reviewing call counts and estimated cost. The plan preview includes only the counts and cost for first attempts. Execution may automatically retry each subject and judge call once. Before --execute, get explicit cost approval for up to twice the previewed subject calls, judge calls, and estimated cost, to cover one retry per call. Execute the matching run command manually. Report invalid or inconclusive results. Before any rerun, preview again, inspect its case_ids, review the calls and cost, and get new approval for the same retry headroom. Results remain advisory, not release gates. See evals/README.md for suite selection and command options.

Evaluating skills

The advisory evaluator tests concrete scenarios modelled on real-world coding work, with expected outcomes and no-change controls. It compares no-skill, forced-skill, and automatic-routing runs. Baseline and automatic use the cases eligible for automatic activation; restraint checks that a skill does not make an unnecessary change. Scorecards also compare subject-side tokens, tool calls, completed turns, elapsed time, and total attempted work per successful outcome. The table reports the latest available result for each skill and correctness metric. These scores were produced using gpt-6-luna with high reasoning, judged by gpt-6-sol with high reasoning. Results are model- and reasoning-specific; other configurations may perform differently. The human audit queue remains open. These are not merge or release gates. The subject and judge each run on Codex by default, or on Claude Code with --runtime claude and --judge-runtime claude; Claude runs need an --output-dir outside the repository. See evals/README.md for evaluation setup and reproducibility.

Skill-revision compatibility checks compare old and revised instructions within each model, separately from these benchmark scores. See the workflow compatibility record for Astra and 5.6 coverage and its current evidence limits.

Skill	Baseline	Automatic	Restraint
compose-animations	75.0%	100.0%	100.0%
compose-component-design	86.7%	100.0%	100.0%
compose-focus-navigation	33.3%	100.0%	100.0%
compose-performance	83.3%	100.0%	100.0%
compose-state-and-effects	83.3%	100.0%	100.0%
compose-ui-testing-patterns	55.6%	100.0%	100.0%
gradle-run	41.7%	100.0%	100.0%
kotlin-api-design	58.3%	100.0%	100.0%
kotlin-concurrency-and-flow	44.4%	100.0%	100.0%
kotlin-control-flow	33.3%	100.0%	100.0%
android-benchmark-comparison	33.3%	100.0%	100.0%
deliver-spec	—	—	—
grounded-writing	0.0%	100.0%	100.0%
implement-with-subagents	—	—	100.0%
release-kotlin-library	0.0%	100.0%	100.0%
run-github-project	—	—	100.0%
shepherd	—	—	100.0%
to-plan	—	—	100.0%

The android-benchmark-comparison, compose-state-and-effects, compose-ui-testing-patterns, gradle-run, grounded-writing, kotlin-api-design, kotlin-concurrency-and-flow, kotlin-control-flow, and release-kotlin-library automatic cells, and the to-plan restraint cell, use later focused evidence. Baseline and efficiency values use the complete suite. The improvement result record, targeted probe record, and inline repair record give provenance and remaining failures.

Skill efficiency

Values are per-run medians, baseline → automatic, followed by the automatic percentage change. These subject-only measurements use the latest complete, same-run evidence available for each suite and include failed runs and negative controls. Baseline-to-automatic efficiency comparisons use only cases eligible for automatic activation. Multi-skill scenarios contribute to every targeted skill row. A turn is one completed top-level turn (a Codex turn.completed or a Claude Code result); time remains environment-sensitive. Run provenance and local scorecard paths are in the GPT-6 improvement result record.

Skill	Tokens / run	Tool calls / run	Turns / run	Time / run
compose-animations	58.6k → 85.4k (+46%)	4 → 5 (+25%)	1 → 1 (+0%)	28.2s → 34.8s (+23%)
compose-component-design	48.7k → 73.4k (+51%)	4 → 5 (+25%)	1 → 1 (+0%)	24.4s → 29.5s (+21%)
compose-focus-navigation	59.1k → 84.9k (+44%)	5 → 5 (+0%)	1 → 1 (+0%)	28.9s → 36.6s (+27%)
compose-performance	49.1k → 85.0k (+73%)	4 → 5 (+25%)	1 → 1 (+0%)	26.4s → 31.8s (+21%)
compose-state-and-effects	60.1k → 89.0k (+48%)	4 → 5 (+25%)	1 → 1 (+0%)	28.2s → 37.8s (+34%)
compose-ui-testing-patterns	60.2k → 84.2k (+40%)	5.5 → 5 (-9%)	1 → 1 (+0%)	27.1s → 26.8s (-1%)
gradle-run	59.8k → 104.3k (+75%)	4 → 7 (+75%)	1 → 1 (+0%)	27.6s → 45.3s (+64%)
kotlin-api-design	60.1k → 83.9k (+40%)	4 → 5 (+25%)	1 → 1 (+0%)	32.8s → 38.8s (+18%)
kotlin-concurrency-and-flow	60.0k → 74.0k (+23%)	4 → 5 (+25%)	1 → 1 (+0%)	26.5s → 28.0s (+6%)
kotlin-control-flow	60.9k → 83.9k (+38%)	5 → 5 (+0%)	1 → 1 (+0%)	26.2s → 38.5s (+47%)
android-benchmark-comparison	46.9k → 53.8k (+15%)	3 → 3 (+0%)	1 → 1 (+0%)	23.2s → 35.0s (+51%)
grounded-writing	35.6k → 56.9k (+60%)	2 → 4 (+100%)	1 → 1 (+0%)	23.2s → 22.1s (-5%)
release-kotlin-library	70.2k → 88.3k (+26%)	4 → 5 (+25%)	1 → 1 (+0%)	42.1s → 43.9s (+4%)

Claude Code

Claude Code: claude-haiku-5-5 with high effort, judged by claude-sonnet-5-5 with high effort on Claude Code. The metrics are defined as above, and — marks a cell with no recorded result. Run provenance and scorecards are in the Claude Code result record.

Skill	Baseline	Automatic	Restraint
compose-animations	91.7%	100.0%	100.0%
compose-component-design	86.7%	100.0%	100.0%
compose-focus-navigation	100.0%	100.0%	100.0%
compose-performance	91.7%	100.0%	100.0%
compose-state-and-effects	79.2%	95.8%	100.0%
compose-ui-testing-patterns	88.9%	100.0%	100.0%
gradle-run	16.7%	83.3%	100.0%
kotlin-api-design	91.7%	91.7%	100.0%
kotlin-concurrency-and-flow	72.2%	100.0%	100.0%
kotlin-control-flow	61.1%	94.4%	100.0%
android-benchmark-comparison	33.3%	100.0%	100.0%
deliver-spec	—	—	100.0%
grounded-writing	0.0%	100.0%	100.0%
implement-with-subagents	—	—	100.0%
release-kotlin-library	16.7%	100.0%	100.0%
run-github-project	—	—	100.0%
shepherd	—	—	100.0%
to-plan	16.7%	100.0%	100.0%

Per-run medians, baseline → automatic, for the same configuration:

Skill	Tokens / run	Tool calls / run	Turns / run	Time / run
compose-animations	51.8k → 85.9k (+66%)	6 → 8 (+33%)	1 → 1 (+0%)	47.7s → 46.4s (-3%)
compose-component-design	52.2k → 72.8k (+40%)	6 → 6 (+0%)	1 → 1 (+0%)	30.2s → 35.2s (+16%)
compose-focus-navigation	62.2k → 88.9k (+43%)	7.5 → 8 (+7%)	1 → 1 (+0%)	44.6s → 56.9s (+27%)
compose-performance	94.3k → 103.8k (+10%)	8 → 9 (+12%)	1 → 1 (+0%)	45.0s → 51.3s (+14%)
compose-state-and-effects	72.4k → 118.4k (+64%)	7 → 9 (+29%)	1 → 1 (+0%)	39.4s → 51.3s (+30%)
compose-ui-testing-patterns	87.0k → 88.3k (+2%)	10 → 8 (-20%)	1 → 1 (+0%)	39.3s → 44.7s (+13%)
gradle-run	75.6k → 105.6k (+40%)	6 → 5 (-17%)	1 → 1 (+0%)	36.3s → 29.9s (-18%)
kotlin-api-design	96.7k → 101.8k (+5%)	8 → 9 (+12%)	1 → 1 (+0%)	45.4s → 53.5s (+18%)
kotlin-concurrency-and-flow	111.2k → 145.2k (+31%)	9.5 → 10 (+5%)	1 → 1 (+0%)	47.1s → 50.4s (+7%)
kotlin-control-flow	119.5k → 138.1k (+16%)	10 → 10 (+0%)	1 → 1 (+0%)	41.3s → 44.1s (+7%)
android-benchmark-comparison	37.7k → 66.3k (+76%)	3 → 3 (+0%)	1 → 1 (+0%)	22.0s → 22.6s (+3%)
grounded-writing	46.6k → 73.6k (+58%)	3 → 5 (+67%)	1 → 1 (+0%)	19.2s → 28.3s (+47%)
release-kotlin-library	55.5k → 60.7k (+9%)	5 → 3 (-40%)	1 → 1 (+0%)	43.6s → 54.9s (+26%)
to-plan	22.9k → 53.4k (+133%)	2 → 4 (+100%)	1 → 1 (+0%)	9.4s → 21.8s (+132%)

License

Apache 2.0