igmarin/rails-context-engineering
rails-context-engineering/SKILL.md
Use before writing code, tests, or PRDs in a Rails project to load the minimum context needed to make correct decisions. Inspects `db/schema.rb`, `config/routes.rb`, neighboring models, factories, specs, engine boundaries, and `Gemfile.lock` to surface existing patterns, naming conventions, and gotchas. Produces a concise context summary before any code is proposed, and a confusion-management block when requirements are ambiguous or specs and code have drifted. Trigger words: load context, gather context, context engineering, read the code first, before I code, existing patterns, project conventions, where is this defined, ambiguous requirements, spec vs code drift, unclear spec, missing requirements, what does the codebase already use, match existing style.
$ install --global
skillsauthnpx skillsauth add igmarin/rails-agent-skills rails-context-engineeringInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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TrivyContainer and dependency vulnerability scanner
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SemgrepStatic code analysis for vulnerabilities
95%
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mcp-scan (Snyk)Model Context Protocol security validation
95%
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Last scanned: Apr 26, 2026, 3:21 AM90.8s4 files scanned
SKILL.md
- name:
- rails-context-engineering
- license:
- MIT
- description:
- >
- code have drifted. Trigger words:
- load context, gather context, context
Rails Context Engineering
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.
HARD-GATE
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.
Process
- Scope the change: In one sentence, name the Rails layer touched (controller, model, service, job, engine, view/Turbo, migration, API, GraphQL).
- Load baseline Rails context: Read at minimum:
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.)
- Load one neighbor of each kind: For each Rails layer touched, open the nearest sibling that already solves a similar problem — a comparable controller, service, spec, factory. See references/context-sources.md for exact Grep/Read patterns per layer.
- Detect drift: If there is an existing spec for the area, compare what it asserts vs what the code currently does. Drift is a red flag — document it.
- Post the Context Summary: Before any proposal, output the template below (see Output Style).
- Handle ambiguity: If steps 2–4 surface a conflict (two patterns used, spec vs code drift, missing requirement, unclear boundary), produce a Confusion Block using references/confusion-management.md. Do not pick silently.
- Hand off: With context loaded, proceed to the next skill (
create-prd,generate-tasks,rails-tdd-slices,rails-stack-conventions, etc.). The Context Summary travels with the task.
Extended Resources
| Resource | When to read | |----------|--------------| | references/context-sources.md | For the exact Grep/Read commands per Rails layer (model, controller, service, job, engine, migration) | | references/confusion-management.md | When two patterns coexist, specs contradict code, or a requirement is missing — for how to surface ambiguity without silently choosing |
Output Style
Every invocation of this skill MUST produce a Context Summary in this exact shape, before any code or spec is proposed:
### 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>
Additional MUSTs:
- One neighbor per layer. Do not dump 5 similar files; pick the closest match and name it.
- Facts only, no code. The summary lists facts about the codebase, not proposed implementation.
- Hand-off line. End the reply with:
Context loaded. Next: <skill-name> — <one-line reason>.
Pitfalls
| 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 |
Integration
| Skill | When to chain | |-------|---------------| | create-prd / generate-tasks | Before scoping a PRD or breaking down tasks on an existing feature area | | rails-tdd-slices | Nearest spec in the summary usually reveals the right first failing spec | | rails-bug-triage / refactor-safely | Context precedes reproduction or characterization tests | | rails-architecture-review / ddd-ubiquitous-language | When context reveals boundary or naming drift |
See EXAMPLES.md for worked Context Summaries and a Confusion Block.
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