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
| Scenario | Primary Skill |
|---|---|
| Fallback: unfamiliar codebase / ambiguity | load-context |
| Planning a feature | create-prd then generate-tasks |
| Choosing where to start testing | plan-tests |
| Reviewing code | code-review |
| Fixing a bug | triage-bug |
Non-negotiable: no implementation code until a test exists, runs, and fails for the right reason (feature missing, not config/syntax).
ALWAYS identify the matching skill and name it explicitly as the next skill to use before responding further.Triages and decomposes any Ruby on Rails request into ordered sub-tasks, then delegates to the correct specialized skill. Enforces the Tests Gate Implementation mandate across all code-producing work.
When a task arrives, identify the matching skill from the tables below and name it explicitly as the next skill to use before responding further.
In an active response, make the routing statement, such as Next skill: skills/context/load-context, the first substantive line before analysis or implementation. When multiple skills may apply, immediately follow the routing line with one concise priority/chain statement, such as Priority: security-check > review-migration; Chain: security-check then review-migration, before any analysis or implementation. For reference artifacts, show at least one concrete active-response example using this routing-first, priority/chain-second ordering.
| Skill | Use when... |
|---|---|
| load-context | Before any code/spec/PRD in an existing Rails codebase — load schema, routes, nearest patterns, surface ambiguity |
| write-tests | Writing, reviewing, or cleaning up RSpec tests; TDD discipline for all implementation |
| plan-tests | Choosing the best first failing spec for a Rails change |
| triage-bug | Turning a bug report into a reproduction spec and fix plan |
| code-review | Reviewing Rails PRs, controllers, models, migrations, or queries — the subject is a specific file or changeset |
| review-architecture | Reviewing structure, boundaries, fat models/controllers — the question is about design or system shape, not a specific PR |
| apply-stack-conventions | Writing Rails code for PostgreSQL + Hotwire + Tailwind stack |
| refactor-code | Restructuring code while preserving behavior |
| create-prd | Planning a feature or writing requirements |
| generate-tasks | Breaking a PRD into implementation tasks |
When multiple skills could apply, state this priority rule immediately after the routing statement:
Priority: TDD → Planning → Domain discovery → Process/refactor → Domain implementation.Use plan-tests when the first failing spec is not obvious.
Key disambiguation signals:
review-architecture vs code-review: use architecture-review when the question is about system shape, service boundaries, or design patterns; use code-review when the subject is a concrete PR, file, or changeset.plan-tests vs write-tests: use tdd-slices when the challenge is which test to write first; use write-tests when the challenge is how to write or improve a test.load-context before any other code-producing skill in an unfamiliar or existing codebase.Fallback for ambiguous requests: If no clear skill match, label this explicitly as Fallback: load-context, load codebase context, then re-evaluate based on findings.
When a request names several changed areas, do not route only to code-review. Decompose the changeset and name the ordered chain:
| Changed area | Add this review skill |
|---|---|
| Controllers, models, services, jobs, or tests | code-review |
| Migrations or schema changes | review-migration |
| Authorization, authentication, secrets, uploads, redirects, or input handling | security-check |
| Engine namespace, dummy app, install generator, host integration, or release surface | review-engine |
| Boundary, orchestration, callback, or abstraction concerns | review-architecture |
Start with load-context for an existing PR or unfamiliar codebase, then run the specialized review skills in risk order: security/data-loss first, migrations second, architecture/engine boundaries third, general code review last.
Sub-skills are invoked by stating their name as the next skill to apply, e.g. "Next skill: skills/workflows/tdd-workflow", before proceeding with that skill's instructions.
TDD Feature Loop (primary daily workflow) — use skills/workflows/tdd-workflow:
skills/context/load-context → [CHECK: context loaded] → skills/workflows/tdd-workflow → PR
Feature (standard): skills/context/load-context → [CHECK: context loaded] → skills/planning/create-prd → [CHECK: PRD approved] → skills/planning/generate-tasks → [CHECK: tasks complete] → skills/workflows/tdd-workflow
Bug fix: skills/testing/triage-bug → [GATE: reproduction spec fails] → skills/workflows/tdd-workflow → fix → verify passes
Multi-concern PR review: skills/context/load-context → skills/code-quality/security-check (if auth/input/secrets touched) → skills/infrastructure/review-migration (if schema touched) → skills/engines/review-engine (if engine touched) → skills/code-quality/review-architecture (if boundaries touched) → skills/code-quality/code-review
Routing statement: Clearly state the next skill being invoked as the first substantive line of the response.
Next skill: skills/context/load-context
This is a feature request with unclear scope. I'll start by loading the codebase context, then create a PRD.Put this routing statement before any deeper analysis. If multiple skills apply, immediately follow it with one concise priority/chain statement before analysis or implementation:
Next skill: skills/context/load-context
Priority: security-check > review-migration > code-review; Chain: load-context then security-check, review-migration, code-review.
This PR spans authorization, schema changes, and general Rails behavior, so I will load context first and then review in risk order.Language: Generated artifacts (YARD docs, Postman collections, READMEs) and output MUST be in English unless explicitly requested otherwise.
| Skill | When to chain |
|---|---|
| load-context | Default for ambiguous requests |
| create-prd | For new features |
docs
evals
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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