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Codex GoC Command

When this skill says goc ..., resolve the executable before running the command:

• In the game-of-cards source checkout, use uv run goc ....
• If goc is already on PATH, use goc ....
• If this skill is loaded from the Game of Cards Codex plugin, use the bundled helper at <plugin-root>/skills/_goc-bootstrap.sh ...; the plugin root is the parent directory that contains both skills/ and bin/.
• If the plugin root is not obvious from the loaded skill path, locate the helper with:

GOC_BOOTSTRAP=$(find "$HOME/.codex/plugins/cache" -path '*/game-of-cards/*/skills/_goc-bootstrap.sh' -type f -perm -111 -exec ls -t {} + 2>/dev/null | head -n 1)
test -n "$GOC_BOOTSTRAP" || { echo "GoC Codex plugin bootstrap not found" >&2; exit 127; }
"$GOC_BOOTSTRAP" --help

Use that helper path in place of bare goc for the rest of the skill. Do not edit deck files directly just because goc is not on PATH.

When to invoke

Invoke when the user says "let's do X", "implement Y", "fix Z", describes a bug, requests a feature, or initiates ANY persistent work item. Title must be user-facing, descriptive, PO-readable (not engineer's jargon). reproduce.py (Step 6) is hand-authored for bug-class cards, not scaffolded.

Preflight

If any ! block below shows goc: command not found, Permission for this action has been denied, or no such file or directory: .game-of-cards/deck/, stop and invoke Skill(kickoff) first. Kickoff detects which setup step is missing (CLI not installed, Bash allowance not granted, project state not scaffolded) and walks the user through it. Re-invoke this skill only after kickoff completes.

File a new card

A card is a self-contained briefing for the next reader — human or agent — written so the work can be picked up cold: its own evidence, its own framing, its own closure contract (the DoD). Scaffold a deck/<title>/ dir with valid frontmatter, an empty log.md, and a placeholder DoD that Skill(finish-card) will refuse to satisfy until you write real criteria. The CLI guarantees frontmatter validity; the body is on you.

Edge cases live in reference.md (sibling file in this skill's directory) — read the named section only when the situation applies:

User argument: $ARGUMENTS

Step 1 — confirm the title

Slug pattern: ^[a-z0-9][a-z0-9-]*[a-z0-9]$. Short, hyphenated, the observable problem, PO-readable — e.g. csv-export-button-truncates-rows-over-10000.

goc new enforces a title-antipattern guard (see Skill(card-schema) "Title antipatterns"): it rejects rN rounds, path-N / phase-N steps, bug-N numbering, _md_ / _py_ infixes, camelCase, and math symbols, suggesting a rephrasing from the observable problem. --allow-jargon only for migration tools. Read the slug aloud — avoid word stutter, colloquial back-half clauses, and family-shape mismatch (reference.md § Title quality).

Verify the title is free: run goc show <your-title> yourself — ERROR: ... not found means safe.

Step 2 — dedup against open / done / disproved queues

Same root cause as an existing card = supporting evidence on that card's body + a log.md appendage on the existing entry, NOT a new filing. Grep for the candidate's identifying string yourself, e.g. goc --status all | grep -i <fragment>.

Titles are not enough. Duplicates hide in the gated backlog: parked cards name your symbol in the body, and nothing re-reads them (reference.md § Dedup against parked cards). A gated hit is a card to strengthen, not to file beside.

grep -rli '<symbol-or-phrase>' .game-of-cards/deck/*/README.md
goc triage                 # gated cards, oldest first

If a disproved rebuttal exists for this hypothesis, re-read it before filing. Re-promote only if git log -p -- <cited-file> shows the cited code has changed since the disproved entry's date.

Step 3 — pick the gate

The CLI default is decision — the fallback for findings whose fix path genuinely needs a human pick. When the work shape makes the right gate clear, set it explicitly:

• --gate none — fully mechanical: sed-style rename, stale-reference patch, single-line constant correction. Autonomous-loop-safe.
• --gate decision — two or more credible fix paths and a human must pick. You MUST then write the ## Decision required body section (per Skill(card-schema) "Decision-gate contract").
• --gate session — research-impacting: framework derivation gap, mechanism choice between literature alternatives, sign convention, new named primitive, default anchored to a paper / axiom.

When in doubt between decision and session: if a ## Decision required section would under-serve the question (options not yet well-scoped, or picking needs new evidence), use session.

If a substantive decision sits at the card's core, consult the consuming repo's rubric before defaulting to decision:

!cat .game-of-cards/hooks/create-card.md 2>/dev/null || true

If the rubric answers cleanly with a principle citation AND primary-source backing, scaffold with --gate none and pre-write a ## Decision (rubric-derived) body section (choice, principle, citation). Reserve human gates for questions the rubric cannot answer (reference.md § Rubric-derived decisions).

Step 4 — scaffold via the CLI

goc new <title> \
  --summary "<what + why>" \
  --contribution <high|medium|low> \
  --gate <none|decision|session> \
  --tag bug \
  --tag <area-tag> \
  --advances <target-title> \
  --advanced-by <parent-title> \
  --commit

Creates deck/<title>/README.md (valid flat frontmatter, placeholder - [ ] (replace with real criteria) DoD) plus an empty log.md. Tags must come from the canonical set — the CLI rejects unknowns; project-local tags register in .game-of-cards/canonical-tags.md (see Skill(card-schema) "Adding new tags").

• Known value-flow at filing time → pass --advances / --advanced-by AND --commit so both edge endpoints land in one atomic commit (without --commit, an explicit-pathspec commit of just the new directory ships a half-edge). The goc new + goc advance two-step is the fallback for edges discovered later.
• Coordinating card? Aggregation epic (closes when its children close) → child.advances: [epic]. Governing cluster (closes when decided) → shared tag, NO edge. Never epic.advances: [children] (BACKWARDS_EPIC_EDGE). Full reasoning: reference.md § Edge direction for coordinating cards.
• The scaffold is born draft: true — hidden from queues until authored (Steps 5–7). Claiming or closing clears the flag; goc publish <title> releases an authored-but-unclaimed card (reference.md § Draft contract).

Step 5 — write the body (the dashboard)

The README body is the card's dashboard: a snapshot of latest knowledge, rewritten in place as understanding evolves. Do NOT append "Latest finding (DATE)" blocks — history belongs in log.md (see Skill(card-schema) "What goes where"). Replace the placeholder with:

• Title (H1) — one-line description.

• Summary — frontmatter summary: (≤ 3 sentences, what + why) so triage views can scan without opening; goc validate requires it once the card leaves draft.

• Location — file:line (bug-class) or doc/section (doc-class).

• What's broken — prose with quoted code AND quoted contradicted doc/comment; the reader must see the conflict.

• Empirical evidence — reproduce.py output verbatim (Step 6).

• Why it matters — connect to a real symptom; cross-link cards as [<title>](../<title>/). For parser / emitter / storage-layer defects, name the reachability path that produces the offending input (reference.md § Reachability).

• Fix — concrete change with file:line. Do NOT apply the fix. For decision gates this collapses into ## Decision required. Consider a sibling artifact file for gated cards (Step 7).

• Refine the DoD — each box a contract, prefixed with its method class (see Skill(card-schema) "DoD method tags"); prefer TDD: whenever a closed-form expected value exists:

  definition_of_done: |
    - [ ] TDD: reproduce.py exits zero (defect no longer fires)
    - [ ] TDD: <specific assertion or metric the fix must satisfy>
    - [ ] EMPIRICAL: <experiment run, verdict recorded in log.md either way>
    - [ ] MECHANICAL: <doc/config edit landed and reads correctly>
    - [ ] PROCESS: <agreement recorded, parent advanced_by updated>
  

Each later round of work rewrites the dashboard and appends a log.md journal entry (what changed, why).

Step 6 — write reproduce.py (bug-class only)

For bug / measurement / regression cards, ship a deck/<title>/reproduce.py that, on a clean checkout, prints output an outside reader would accept as proof. Find the repo root with the parent-walk pattern — never parents[N] with a fixed N:

import sys
from pathlib import Path

def _repo_root() -> Path:
    p = Path(__file__).resolve().parent
    while p != p.parent:
        if (p / "pyproject.toml").exists():
            return p
        p = p.parent
    raise RuntimeError("repo root (pyproject.toml) not found")

sys.path.insert(0, str(_repo_root()))

Run via uv run python deck/<title>/reproduce.py; paste the output verbatim into "Empirical evidence".

For plausible-but-unreproduced hypotheses, add --tag unverified and document the falsifying-test recipe in the body; drop the tag once a working reproduce.py lands.

Step 7 — rich artifact files (optional, any card class)

When markdown can't express the content — colored option grids, state diagrams, interactive decision forms, screenshots — ship the artifact as a sibling file in the card directory and link it from the README ([See the matrix](comparison-matrix.html)). Sibling files are opaque to the engine. Bundle shape, use/skip criteria: reference.md § Rich artifact files.

Cross-references

• reference.md (this skill's directory) — edge cases routed above.
• Skill(card-schema) — field semantics, enums, canonical tags.
• Skill(scan-deck) — dedup queries; Skill(advance-card) — if the body reveals a different gate than scaffolded.
• Commit the filing per the consuming repo's checks and GoC hooks.