/gist-plan

name: gist-plan
description: "GIST planning workflow. Structure goals into ideas, steps, and tasks using Gilad's evidence-guided framework."
metadata:
  instruction_budget: "32"
  framework_dependency: "mycelium"
  framework_dependency_note: "This skill is designed to run within the Mycelium framework (https://github.com/haabe/mycelium). Standalone use will skip the canvas state, theory gates, and harness behavior the skill assumes. Install: /plugin install mycelium@haabe-mycelium."

GIST Planning

Replace opinion-based roadmaps with evidence-guided planning. Source: Gilad (Evidence Guided).

Preflight: Read target canvas file(s) before any Write/Edit

**Hard rule.** Before issuing `Write` or `Edit` against any `.claude/canvas/*.yml`, use the **Read tool** on that file in this session. Claude Code's Read-before-Write check requires the `Read` tool specifically — `cat`/`head`/`grep` via Bash do NOT satisfy it.

**Edit vs Write — different cost profiles** (verified 2026-05-14):

• **`Edit`** (exact-string replacement): `Read` with `limit: 1` satisfies the check at ~50 tokens. State-tracking is per-file, not per-byte — subsequent `Edit` calls work anywhere in the file. Use this for partial updates against large canvas files (e.g., `purpose.yml` at 800+ lines).
• **`Write`** (full replacement): do a **full Read** first. Write obliterates the file; you should see what you're about to replace. The `limit:1` shortcut is *not* appropriate here.

**ID-bearing entries — scan the ID space before assigning** (added 2026-05-15, v0.23.19): When adding a new component, opportunity, solution, or any other ID-bearing entry to a canvas file, run a Bash grep first to confirm the next ID in your prefix sequence is actually free:

grep -o "<prefix>-[0-9][0-9]*" .claude/canvas/<file>.yml | sort -u -t- -k2 -n | tail -3

Replace `<prefix>` with the canvas's ID prefix (`comp` for landscape, `opp` for opportunities, `sol` for solutions, `ht` for human-tasks, etc.). Then pick the next free integer, **matching the zero-padding already used in that file**. The sort is NUMERIC (`-t- -k2 -n`) rather than lexical, and that is not pedantry: a plain `sort -u` orders `ht-1` after `ht-080`, so on a canvas with inconsistent padding it reports the wrong maximum and the next ID collides. Verified on the dogfood repo 2026-08-13, where lexical sort returned `ht-1` as the highest human-task ID against an actual `ht-080`. `grep -o` is also deliberate: it matches IDs wherever they appear, including cross-references and prose, so an ID that was promised somewhere but not yet defined is not handed out twice. `validate_canvas.py` has a duplicate-ID check (lines 230-239) that catches the failure on CI, but a duplicate can persist in the working tree for days if CI isn't run between edit and discovery — see roadmap-repo `corrections.md` 2026-05-15 "Duplicate canvas ID created in landscape.yml" for the worked example.

Original failure mode: anti-pattern #7 instance #5, 2026-05-09 — agent conflated Bash `head` with the Read tool, lost ~14k tokens to a Write-fail → remedial-full-Read → re-Write loop. The `limit:1` discipline (graduated 2026-05-14, v0.23.18) prevents the second-order cost where the agent *correctly* follows the rule but full-Reads every time. The ID-scan discipline (graduated 2026-05-15, v0.23.19) prevents the related class where the agent reads enough of the file to satisfy the Edit check but not enough to see existing ID assignments — kin to anti-pattern #8 (Stale State Read).

If this skill writes to multiple canvas files, register each one first (limit:1 for Edit-only paths; full Read for Write paths) AND ID-scan any prefix you intend to assign.

See `CLAUDE.md` *Canvas writes — Read before Write* for the canonical rule.

Workflow

1. Set Goals (Quarterly)

• Derive from North Star input metrics or OKRs
• Format: "Improve [metric] from [current] to [target] by [date]"
• Maximum 3 goals per quarter
• Update .claude/canvas/gist.yml goals section

2. Generate Ideas (Ongoing)

• Ideas are hypothetical ways to achieve goals
• Most ideas fail (>80%) -- this is expected and planned for
• Generate many, hold loosely
• Store in .claude/canvas/gist.yml idea bank with ICE scores
• Never commit to an idea until evidence supports it

3. Score with ICE + Confidence Meter

Use `/mycelium:ice-score` to prioritize. ICE scoring (Ellis; confidence dimension added by Gilad):

• Confidence is NOT gut feel -- it maps to evidence levels
• 0.1 = opinion only | 0.5 = data supports | 0.7 = tested | 0.9 = launched
• Rescore after every experiment

> *Mycelium uses 0.0-1.0 (adapted from Gilad's 0-10 non-linear Confidence Meter). See `/mycelium:ice-score` for details.*

4. Design Steps (per top idea)

• Steps are small, time-boxed activities that build evidence
• Each step has: hypothesis, method, success criteria, **MoSCoW priority**
• Tag each step as **Must** / **Should** / **Could** / **Won't** (DSDM):
• **Must**: Non-negotiable. Delivery fails without this. All REVIEW checks apply.
• **Should**: Important. Ship if time allows. All REVIEW checks apply.
• **Could**: Nice-to-have. Cut first when timebox runs out. NUDGE checks only.
• **Won't**: Explicitly out of scope for this cycle. Documented for future reference.
• Steps follow a confidence ladder: assessment -> exploratory experiment -> feature experiment -> launch
• Each step produces evidence that increases or decreases confidence
• If evidence is negative: pivot or kill the idea (sunk cost is irrelevant)
• For user-facing ideas, frame hypotheses in Lean UX format: "We believe [outcome] for [users] if [change]." (Gothelf)
• **When a delivery timebox is exceeded**: Flex scope using MoSCoW — cut Could/Won't before compromising Must/Should

5. Execute Tasks (Sprint-level)

• Tasks belong to the CURRENT step only
• Don't plan tasks for future steps
• Standard agile execution

6. Reprioritize (Continuous)

After each step completes:

• Update ICE s