Curated library of 41 public AI agent skills for Ruby on Rails development. Organized by category: planning, testing, code-quality, ddd, engines, infrastructure, api, patterns, context, and orchestration. Covers code review, architecture, security, testing (RSpec), engines, service objects, DDD patterns, and TDD automation. Repository workflows remain documented in GitHub but are intentionally excluded from the Tessl tile.
95
93%
Does it follow best practices?
Impact
96%
1.77xAverage score across 41 eval scenarios
Passed
No known issues
| Area | What to check |
|---|---|
| Schema | db/schema.rb for tables and columns |
| Routes | config/routes.rb for surrounding paths |
| Deps | Gemfile.lock for Rails version and gems |
| Neighbors | Closest existing sibling file to match style |
| Specs | Closest existing test for behavior drift |
DO NOT propose code, specs, PRDs, or task lists until the Context Summary is posted.
DO NOT silently resolve ambiguity — if requirements conflict or specs and code disagree, post a Confusion Block first.
DO NOT load the entire repo — use targeted reads (schema, routes, one neighbor of each kind).
ALWAYS cite the files you read (path:line where possible) so the user can verify.
ALWAYS re-check context when the user's request changes scope mid-conversation.Load minimum context before any code, spec, or PRD in an existing Rails codebase. A fifteen-second read of db/schema.rb, config/routes.rb, and one neighbor saves a full retry.
db/schema.rb — tables and columns involved (grep by table name)config/routes.rb — routes that border the changeGemfile.lock — confirm Rails version + domain gems (sidekiq, pundit, rspec, rails-i18n, graphql, etc.)grep -r "class.*Controller" app/controllers, grep -r "class.*Service" app/services, etc.
Include the grep command used for each neighbor search in the final Context Summary notes.### Confusion Block
- Conflict: <what conflicts — e.g., spec asserts X but code does Y>
- Options: <list the options with their tradeoffs>
- Recommendation: <state which option and why, or ask user to choose>Do not pick silently.
7. Hand off: With context loaded, proceed to the next skill (create-prd, generate-tasks, plan-tests, apply-stack-conventions, etc.). The Context Summary travels with the task.
| Pitfall | What to do |
|---|---|
| Generic "the model, the controller" language | Name the class and file — generic language is the symptom of skipped context |
| Citing paths without line numbers | Use path:line when referencing a method, class, or association |
| Ignoring engine boundaries | Name the engine and its host integration points when a mounted engine is touched |
| Ignoring spec/code drift | A passing stale spec is worse than a missing spec — call it out in Confusion |
### Context Summary
- Scope: <one line — Rails layer and nearest class/file area>
- Rails version: <from Gemfile.lock>
- Relevant tables: <table names from db/schema.rb, columns that matter>
- Relevant routes: <resource/member routes from config/routes.rb>
- Nearest pattern: <path:line — one existing file that solves a similar problem>
- Nearest spec: <path:line — existing spec for this area (or NONE)>
- Engine boundary: <engine name or N/A>
- Gotchas: <domain gem quirks, enum mappings, polymorphic edges, counter caches, soft-delete, single-table inheritance — only list if present>
- Confusion: <NONE, or a one-line pointer to the Confusion Block below>Context loaded. Next: <skill-name> — <one-line reason>.| Skill | When to chain |
|---|---|
| create-prd / generate-tasks | Before scoping a PRD or breaking down tasks on an existing feature area |
| plan-tests | Nearest spec in the summary usually reveals the right first failing spec |
| triage-bug / refactor-code | Context precedes reproduction or characterization tests |
| review-architecture / define-domain-language | When context reveals boundary or naming drift |
docs
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mcp_server
skills
api
generate-api-collection
implement-graphql
code-quality
apply-code-conventions
apply-stack-conventions
assets
snippets
code-review
refactor-code
respond-to-review
review-architecture
security-check
context
load-context
setup-environment
ddd
define-domain-language
model-domain
review-domain-boundaries
engines
create-engine
create-engine-installer
document-engine
extract-engine
release-engine
review-engine
test-engine
upgrade-engine
infrastructure
implement-background-job
implement-hotwire
optimize-performance
review-migration
seed-database
version-api
orchestration
skill-router
patterns
create-service-object
implement-calculator-pattern
write-yard-docs
planning
create-prd
generate-tasks
plan-tickets
testing
plan-tests
test-service
triage-bug
write-tests
workflows