Feature Prompt

feature-prompt

Produces the smallest useful handoff for the next step — not an implementation spec. grill-with-docs will challenge the plan, sharpen domain terms, update CONTEXT.md, and offer ADRs only for hard decisions.

Output contract

Final prompts use this shape:

Project:
[Full Project Matrix code, repo, path, or context. Use one line.]

What is needed:
[The change to make. One short paragraph or 2-4 bullets.]

Why it is needed:
[The problem, user pain, business reason, or workflow gap — so grill-with-docs
can challenge tradeoffs, not just wording.]

Expected end result:
[Observable done state. Prefer user-visible behavior, passing checks, or a
demo flow; seeds the later acceptance criteria.]

Known limits:
[Conditional. Hard constraints, non-goals, compatibility needs, or exclusions
already known. When intake was split, list the deferred slices as explicit
non-goals so the scoping decision survives in the artifact.]

Open questions:
[Conditional. Real unresolved questions for grill-with-docs to attack.]

Emit Known limits and Open questions only when useful; the other four sections are always present.

Rules

Intake and inference

• Start from free-form intake. Infer first; ask only when What is needed is

unclear or project/context cannot be inferred safely.

• Use repo evidence when cheap: Project Matrix, cwd, CONTEXT.md,

CONTEXT-MAP.md, and ADR names. Do not run a broad code scan by default.

• If graphify-out/graph.json exists (project root, else workspace root), query it before raw search; older than ~7 days → suggest graphify update .; missing → skip graphify.

Scope and slicing

• Before drafting, apply the fog test: can you state the destination in one

line and name every open decision as a sharp question, right now? If not, stop and suggest /wayfinder — it charts those decisions and resolves them one per session. Do not write a PR-sized prompt for foggy work. Fog, not size, is the test: a large mechanical change with nothing left to decide is not fog.

• Default to one thin vertical slice, small enough to review and merge

independently. Broad intake gets split: draft this prompt for slice 1 only; Known limits records the deferred slices. A prompt that would force a very long grilling session → ask to split scope before finalizing; user away → split it yourself and note the split at the top of the response.

• When the user intends parallel agent threads, split slices to minimize

shared-file coupling.

Context and evidence

• Use the full Project Matrix code verbatim whenever one exists. Never

abbreviate project codes or invent shorthand.

• Reference existing files/modules/seams when known, and keep "reuse existing

seam vs create new seam" under Open questions explicitly — it is how duplicate logic gets prevented.

• Include only non-obvious context: constraints, architecture quirks, and

domain rules the model cannot infer cheaply from repo scans. Omit stack facts the code already shows.

• Dependency internals central and unclear → suggest fetching targeted source

(e.g. opensrc) as a follow-up context step before deep grilling.

• Keep domain words intact. Do not invent glossary definitions;

grill-with-docs owns that.

Questions and output discipline

• Do not create Domain terms, Decisions, Dependents, Risks,

Doc anchors, Integration, Constraints, or Acceptance sections. Fold useful facts into the six contract sections; user-stated hard decisions go under Known limits.

• All unclear decisions land under Open questions; ungrillable ones ("needs

to feel/see it") also route to /handoff + /prototype before deep grilling continues.

• Keep Open questions to the highest-leverage unknowns (usually 1-5). Drop

trivia that can be decided during implementation.

• A vague answer to a sharp question ("as fast as possible", "all users") is

not an answer — ask once for a number or a named segment; still vague → park it under Open questions as written.

• Do not implement the feature, create a spec, or edit ADRs. CONTEXT.md

changes happen only through the approved candidate-terms flow below.

• Keep the final prompt spartan, direct, plain English — it is a generated

artifact, never compressed shorthand.

Candidate context terms

Only when cheap repo evidence or user-requested exploration reveals domain terms missing from or stale in CONTEXT.md — never run extra exploration just to fill this. The shared flow — what qualifies, presentation, the away-fallback, applying approvals — lives in [references/context-terms.md](references/context-terms.md). Show candidates before finalizing the prompt, apply only approved updates, and report the edited path before saving. Terms still needing review stay under Open questions.

Agent use

Sub-agents: dispatch local lanes automatically for independent work — never cloud agents; announce the lane count at dispatch and report each lane as it completes. Lanes are for fast, independent context checks only — no worker agents, no code edits.

Final output

1. Draft the final prompt.
2. For non-trivial or inferred prompts, show it once for correction. User

away → save as drafted and note at the top that it is unconfirmed.

1. If candidate context terms were found, run the shared approval flow.
2. Verify the pre-save checklist and save to the path below, then re-open the

saved file and confirm sections and path match the approved draft before reporting.

1. Add only:

Context updated:  [only if edited]
Saved to: 
Next: pass this final prompt to the `grill-with-docs` skill.
Suggested next skills (optional):

- /grill-with-docs: challenge assumptions, sharpen domain terms, and confirm decisions.
- /handoff + /prototype: when open questions are ungrillable and need a higher-fidelity spike.
- /to-spec: if this needs a formal spec (PRD) after grilling.

File output

Path

/specs/prompts/NNNN--prompt.md

Resolve `: the *.code-workspace directory if one exists, else the per-context root (CONTEXT-MAP.md` at repo root), else the repo root.

• NNNN — scan /specs/adr/ and specs/prompts/ for the

highest existing four-digit number and increment, so prompt numbers never collide with ADRs. ADRs are numbered independently from specs/adr/ alone; the prompt path recorded in the ADR is the link, not the number.

• **`** — kebab-case from What is needed`, max 4 words, ASCII.
• -prompt — fixed suffix marking the artifact type.

Conflict handling

• Create specs/prompts/ lazily. Never overwrite a number already used by

another artifact. Never delete unrelated files.

• A prior same-slug prompt counts as hand-edited when git shows commits or

working-tree changes to it that this session didn't make; if git can't tell (untracked file), assume hand-edited.

• Unchanged prior same-slug prompt → overwrite in place. Hand-edited → show

the diff and ask: overwrite, new numbered revision, or abort. If the user is away, write a new numbered revision — never overwrite hand edits unconfirmed.

File body

Write exactly the final prompt body — no preface, no generated-by header — drop-in usable as input to grill-with-docs.

Pre-save checklist

• [ ] Only the six allowed section headers appear, in contract order
• [ ] Project: names the full Project Matrix code verbatim (when one exists)
• [ ] NNNN unique across specs/adr/ and specs/prompts/; slug ≤ 4 words,

kebab-case ASCII, -prompt suffix

• [ ] Split intake: deferred slices recorded under Known limits
• [ ] File body is the prompt only — drop-in, no preface

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: devarfeen
• Source: devarfeen/agent-skills-kit
• License: MIT

Install and usage instructions live in the source repository linked above.