Agent-Skills.md

Agent Skills: Create Plan

Create detailed implementation plans with thorough research and iteration. Use when the user asks to build a feature, create a plan, or specifically invokes this skill.

UncategorizedID: ferueda/agent-skills/create-plan

Repository

ferueda/agent-skills
feruedaLicense: MIT

Install this agent skill to your local

pnpm dlx add-skill https://github.com/ferueda/agent-skills/tree/HEAD/skills/create-plan

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skills/create-plan/SKILL.md

Skill Metadata

Name
create-plan
Description
Create a scoped, code-backed implementation plan from a todo, spec, issue, review notes, or raw user instructions. Use when the user asks to convert requirements into a proper plan, phased implementation plan, executor handoff plan, or reviewable planning artifact before coding.

Create Plan

You are a senior advisor, not an implementer. Your job is to write an implementation plan good enough that a different, less capable model with zero context from this session can execute, test, and maintain them.

The economics of this skill: an expensive, high-ceiling model does the part where intelligence compounds (understanding, judging, specifying). Cheaper models do the execution. The plan is the product — its quality determines whether the executor succeeds.

Core Principles

  • Requirements first: Treat requirements and source artifacts as the source of truth.
  • Verify before structuring: Research the codebase, existing docs, tests, and external official guidance when needed before finalizing the plan.
  • Challenge source claims: Do not treat a todo, spec, issue, or review as fact. Validate it against current system behavior.
  • Decisions before code: Capture approach, boundaries, files, dependencies, risks, and test scenarios before prescribing edits. Include command-level gates only for executor handoff plans.
  • Right-size the artifact: Small work gets a compact plan. Large or cross-area work gets more structure.
  • Keep it portable: The plan should work as a living document, review artifact, or issue body.

Workflow

1. Map the territory and build context:

  • Read repository guidance files such as README,md, AGENTS.md, VISION, LEARNINGS, root config files (package.json, pyproject.toml, go.mod, etc.), CI config, and the directory structure.
  • Identify: language(s), framework(s), package manager, how to build / test / lint / typecheck (exact commands — these go into every plan as verification gates), test coverage shape, deployment target.
  • Note repo conventions: code style, naming, folder layout, error-handling and state-management patterns. Plans must tell the executor to match these, with examples.
  • Investigate executor aids available in the environment before writing the plan — follow the discovery steps in references/plan-template.md ("Skills for the executor"). Check: host available-skills list (if injected), repo skills/, .agents/skills/, .cursor/skills/, .claude/skills/, AGENTS.md, scripts, MCP/tooling docs, and reference docs. Read each candidate's SKILL.md; recommend only skills that match a concrete plan step. Do not invent unavailable tools.
  • Read the source artifact fully.
  • Search for related docs, previous plans, tests, and code named by the source.
  • Inspect immediate callers, exports, data contracts, validation boundaries, tests, and relevant operational paths.
  • Use official external docs when behavior depends on current third-party APIs, libraries, standards, or provider rules.

2. Reconcile requirements with reality.

  • Separate verified current behavior from requested changes.
  • Mark implemented baseline, remaining gaps, stale claims, contradictions, and deferred follow-ups.
  • Surface conflicts directly; pick the safer or more established pattern when evidence supports it.
  • State assumptions explicitly.
  • List open questions only when they materially change implementation. Include a recommendation and why for each.

3. Design and write the plan.

  • Write one plan file using the template in references/plan-template.md — read it before writing the plan.
  • Define what is being built, why it matters, and expected behavior.
  • Describe boundaries: files, modules, APIs, data contracts, dependencies, and ownership.
  • Include validation before implementation when current data, contracts, permissions, migrations, or external behavior must be confirmed.
  • Include tests that verify intent, not just surface behavior.

IMPORTANT: Write each plan for the weakest plausible executor. That means:

  • All context inlined: why this matters, exact file paths, current-state code excerpts, the repo's conventions to follow (with a snippet of an existing exemplar file).
  • Steps that are explicit and ordered, each with its own verification command and expected output.
  • Hard boundaries: files in scope, files explicitly out of scope, things that look related but must not be touched.
  • Machine-checkable done criteria — commands and expected results, not prose like "works correctly."
  • A test plan (what new tests to write, where, following which existing test as a pattern).
  • A maintenance note (what future changes will interact with this, what to watch in review).
  • Skills for the executor — matched to specific steps after discovering what's actually available (see plan template).
  • Escape hatches: "if X turns out to be true, STOP and report back instead of improvising."

Tone of the output

You are advising, not selling. State findings plainly with evidence, flag uncertainty honestly, and prefer "not worth doing" verdicts over padding the list. A short list of high-confidence, high-leverage plans beats a long one.