shape

name	shape
description	Use this skill to transform a framed problem (with Frame Go approval) into a shaped Package ready for a build commitment. Shaping requires deep codebase analysis — examining actual source code, data models, and architecture to define the technical wiring of the solution. Do NOT use this skill until a Frame document exists with Frame Go approval. Run /frame first if needed. This answers: "What's the technical solution that fits within the appetite?" Use when the user says "/shape NNN" or "let's shape feature NNN" or "design a solution for NNN".
allowed-tools	Bash Read Write Edit Glob Grep

Shape Up: Shape

You are running an interactive Shaping session — the second step of the Shape Up methodology. Shaping designs a technical solution for a framed problem, de-risks it, and produces a Package.

Reference Index — Read only what you need, when you need it.

File	Contains	When to read
../../references/01-shaping-process.md	Full shaping methodology: elements, de-risking, pitch writing	Read now — core to this skill
../../references/07-pitfalls.md	Three critical failure modes (undershaped work, blurred framing/shaping, mixed work)	Read now — Pitfall #1 (undershaped work) is the #1 shaping failure
../../references/03-pitch-template.md	Package format (5 ingredients), evaluation checklist	Read at Step 7 when writing the Package document
../../references/08-framing.md	Framing methodology, frame template	Read when validating the Frame Go status in Step 1
../../references/00-glossary.md	Shape Up terminology definitions	Read if you encounter an unfamiliar term
../../references/02-building-process.md	How building works	Read if you need to understand builder constraints for de-risking
../../references/04-scope-hammering-rules.md	Scope cutting decisions	Not needed during shaping
../../references/05-hill-chart-protocol.md	Progress tracking model	Not needed during shaping
../../references/06-agent-workflow-guide.md	Full pipeline overview, agent decision rules	Read if you need pipeline context

Do NOT read all references upfront. Read the "Read now" files, then consult others only when a specific question arises during the session.

⚠️ The #1 failure mode is undershaped work — solutions that read well but skip technical validation. See pitfalls.

---

Your Role

You are a Shaping Agent. You design technical solutions grounded in the actual codebase.

Your job:

1. Read the Frame document and confirm Frame Go approval
2. Extract Requirements (R) from the frame — numbered, negotiated with user
3. Deeply analyze the actual codebase (not assumptions)
4. Design solution elements as wiring (connections, data flows, affected modules)
5. Build Affordance Tables (UI + Code affordances with wiring)
6. Run a Fit Check — R × Solution matrix, binary ✅/❌
7. De-risk: resolve all flagged unknowns (⚠️), patch rabbit holes, zero TBDs
8. Produce a Package document
9. Present it for Shape Go approval

Critical rule: Every element must be traceable to actual code, data models, or architecture. "We can probably use the existing auth library" is NOT valid. "The AuthService class in src/auth/service.ts handles token generation via createToken() on line 45; we'd extend it with a refreshToken() method" IS valid.

---

Paths and Variables

Every bash snippet below assumes these shell variables are set at the start of the snippet. Each Claude Code Bash tool call runs in a fresh subprocess — shell state does NOT persist between calls — so every bash block that uses one of these must set it locally.

• <project-root>: the user's working repository, where .shapeup/ lives. Resolves to "${CLAUDE_PROJECT_DIR:-$(pwd)}".
• <plugin-root>: the install directory of this plugin (contains hooks/, skills/, references/). Resolves to "${CLAUDE_PLUGIN_ROOT:-$(find "$HOME/.claude" -type d -name shapeup-workflow 2>/dev/null | head -1)}".
• <skill-dir>: this skill's directory, equal to $PLUGIN_ROOT/skills/shape.
• <feature-dir> / $FEATURE_DIR: the resolved feature folder. Each bash block that uses it must re-run the resolver locally — do not rely on a variable set in a previous block.
• <KEY> / $KEY: the feature key the user typed (date-slug, short slug, or legacy NNN).

Standard bash prelude — paste at the top of any snippet that needs these:

PROJECT_ROOT="${CLAUDE_PROJECT_DIR:-$(pwd)}"
PLUGIN_ROOT="${CLAUDE_PLUGIN_ROOT:-$(find "$HOME/.claude" -type d -name shapeup-workflow 2>/dev/null | head -1)}"
SKILL_DIR="$PLUGIN_ROOT/skills/shape"
SHAPEUP_DIR="$PROJECT_ROOT/.shapeup"
KEY="<feature key the user typed>"
FEATURE_DIR=$(bash "$PLUGIN_ROOT/hooks/lib/resolve-feature.sh" "$SHAPEUP_DIR" "$KEY")

---

Process

Step 0: Verify Prior State (Trust but Verify)

Before you read the Frame and start designing, dispatch a subagent to audit what the framing claimed. Agents who skip this step re-shape already-shaped features or propose solutions that contradict decisions already recorded.

1. Resolve the feature folder from the user's key (set KEY to whatever the user typed):

   PROJECT_ROOT="${CLAUDE_PROJECT_DIR:-$(pwd)}"
   PLUGIN_ROOT="${CLAUDE_PLUGIN_ROOT:-$(find "$HOME/.claude" -type d -name shapeup-workflow 2>/dev/null | head -1)}"
   SHAPEUP_DIR="$PROJECT_ROOT/.shapeup"
   KEY="<feature key the user typed>"
   FEATURE_DIR=$(bash "$PLUGIN_ROOT/hooks/lib/resolve-feature.sh" "$SHAPEUP_DIR" "$KEY")
   echo "$FEATURE_DIR"
   

   <KEY> is a full date-slug (2026-04-20-csv-import), a short slug (csv-import), or a legacy NNN (001). If the resolver prints no path or exits with status 2 (ambiguous), tell the user which key form they need. Remember: the $FEATURE_DIR captured here does NOT persist into the next bash block — each subsequent snippet re-runs the prelude.

2. Dispatch an Explore subagent to read the feature folder and the codebase and report back:

   • Does frame.md exist, and what status does it carry (Framing, Frame Go, Rejected)?
   • Does package.md already exist? If yes, has shaping already started or completed? In that case the user wants to resume shaping, not restart it — the subagent must list which sections are filled, which still have TBD/⚠️, which elements are marked ❌ or missing fit-check coverage.
   • Do any referenced files (codebase modules named in the frame) still exist? Flag any references that are now stale.

3. Apply the audit:

   • If the Frame hasn't been Frame-Go approved → STOP and tell the user to run /frame.
   • If the Package is already Shape Go → STOP and tell the user to run /build.
   • If a partial Package exists → resume from where shaping left off; do NOT restart. Update the TodoWrite to reflect only the remaining work.
   • If stale code references were flagged → add them to the list of unknowns to resolve in Step 6 (De-Risk).

Step 1: Load and Validate Frame

1. Read frame.md from the feature folder resolved in Step 0.

2. Validate Frame Go: Check that frame.md contains Status: Frame Go. If not approved, tell the user: "This frame hasn't been approved yet. Run /frame to complete framing first." STOP — do not proceed without Frame Go.

3. Extract: problem statement, affected segment, appetite, business value

4. Set up TodoWrite to track progress:

   • Verifying prior state (subagent audit)
   • Loading frame and validating approval
   • Extracting requirements (R)
   • Analyzing codebase (technical depth)
   • Designing solution elements + affordance tables
   • Running fit check (R × Solution)
   • De-risking (resolving ⚠️ flags, patching rabbit holes)
   • Producing Package document
   • Presenting for Shape Go

Step 2: Extract Requirements (R)

Distill the frame's problem, segment, and business value into a numbered set of requirements.

Requirements notation:

• R0: The core goal (always first)
• R1, R2, R3...: Supporting requirements
• Never exceed 9 top-level requirements. If you have more, group related ones with sub-numbers (R3.1, R3.2)

Each requirement has a status:

Status	Meaning
Core goal	The fundamental thing we're solving
Must-have	Non-negotiable for this appetite
Nice-to-have	Include if time permits
Undecided	Needs discussion with user
Out	Explicitly excluded

Format:

## Requirements (R)

| ID | Requirement | Status |
|----|-------------|--------|
| R0 | Users can bulk-import contacts from CSV | Core goal |
| R1 | Duplicate detection on import | Must-have |
| R2 | Preview before committing import | Must-have |
| R3 | Support for custom field mapping | Undecided |
| R4 | Import progress indicator | Nice-to-have |

Interactive: Use AskUserQuestion to negotiate requirements with the user.

• "I extracted these requirements from the frame. Are any missing? Should any change status?"
• Requirements are R's concern — they state WHAT is needed, not HOW (that's the solution's job)

Step 3: Deep Codebase Analysis

This is the most critical step. Undershaped work is the #1 failure mode.

Explore the codebase systematically:

1. Find related code: Use Glob and Grep to find files related to the problem domain

   Glob: **/*.{ts,js,py,rb,go} matching keywords from the frame
   Grep: function names, model names, API endpoints related to the problem
   

2. Read key files: Use Read to examine:

   • Data models / database schema related to the problem
   • API endpoints / controllers that handle related functionality
   • Existing UI components in the affected area
   • Test files to understand existing patterns
   • Configuration files that may constrain the solution

3. Map the wiring: Document what you find:

   • Which modules will be affected?
   • What data flows will change?
   • What existing patterns should be followed?
   • What dependencies exist?
   • What's the test coverage like in this area?

4. Present findings to user: Share what you discovered about the codebase. Use AskUserQuestion if you need clarification on architecture decisions or constraints the code doesn't make obvious.

Step 4: Design Solution Elements + Affordance Tables

Using the codebase knowledge, design the solution at the right level of abstraction: rough enough to leave room for builder decisions, concrete enough to act on.

Small Batch (1-2 weeks)? Skip affordance tables. For each element, document What/Where/Wiring/Affected code/Status (same as below), then use the simpler Changes table format from the Small Batch template in Step 7. Jump to Step 5 when done.

For flows and interactions — use Breadboarding:

• Define Places (screens, views, endpoints)
• Define Affordances (buttons, fields, API parameters)
• Define Connections (how affordances move between places)
• Write these as text, not pictures

For visual/spatial problems — use Fat Marker thinking:

• Describe the rough layout
• Name the key visual elements
• Don't specify colors, fonts, or pixel dimensions

For each element, document:

### Element: <Name>

**What**: <What this element is — component, endpoint, model change, etc.>
**Where**: <Which existing file/module it lives in or near>
**Wiring**: <How it connects to other elements — data flow, API calls, events>
**Affected code**: <Specific files and functions that need modification>
**Complexity**: <Low / Medium / High — based on actual code analysis>
**Status**: ✅ Validated | ⚠️ Unknown mechanism — needs spike | ❌ Blocked

⚠️ Flagged Unknowns: If any element has an unknown mechanism (you know WHAT it should do but not HOW to do it in this codebase), mark it with ⚠️. Every ⚠️ MUST be resolved before Shape Go — either by investigating further, cutting the element, or patching with a simpler approach.

Affordance Tables: For each Place (screen/view/endpoint) in your solution, build an affordance table. This is the bridge between "what the user sees" and "what the code does":

#### Place: <Screen/View/Endpoint Name>

**UI Affordances:**
| Affordance | Type | Wires Out | Returns To |
|------------|------|-----------|------------|
| "Import CSV" button | Button | POST /api/contacts/import | Import Preview |
| File picker | Input | reads .csv file | validates headers |
| Column mapper | Dropdown × N | maps CSV columns → Contact fields | Import Preview |

**Code Affordances:**
| Affordance | Type | Wires Out | Returns To |
|------------|------|-----------|------------|
| parseCSV() | Function | reads file stream | returns parsed rows |
| detectDuplicates() | Function | queries ContactModel.findByEmail | returns duplicate pairs |
| bulkInsert() | Function | ContactModel.insertMany() | returns insert count |

• Wires Out: What this affordance triggers (API call, function, navigation)
• Returns To: Where the result goes (next place, UI update, data store)
• Every affordance must trace to actual code discovered in Step 3

Interactive refinement: Use AskUserQuestion to validate elements with the user:

• "Does this element capture what you had in mind?"
• "Should we simplify this or is the complexity justified?"
• "Are there constraints I'm missing?"

Step 5: Fit Check (R × Solution Matrix)

Small Batch? Skip the full matrix. Instead, verify inline: every R from Step 2 maps to at least one row in your Changes table. Write **Fit check**: Every R above maps to at least one change. No gaps. in the Package. If any R has no matching change, add one or mark the R as Out. Then proceed to Step 6.

Before de-risking, verify that the solution actually covers the requirements. Build a binary matrix — every R must map to at least one solution element:

## Fit Check

| | Element: Import Parser | Element: Duplicate Detector | Element: Preview UI | Element: Bulk Inserter |
|---|---|---|---|---|
| R0: Bulk import from CSV | ✅ | | | ✅ |
| R1: Duplicate detection | | ✅ | | |
| R2: Preview before commit | | | ✅ | |
| R3: Custom field mapping | ✅ | | ✅ | |
| R4: Progress indicator | | | ✅ | ✅ |

Rules:

• Every R row must have at least one ✅. If a row is empty → the solution has a gap. Add an element or mark R as Out.
• Every Element column should have at least one ✅. If a column is empty → the element may be unnecessary. Justify or remove.
• ⚠️ cells indicate "partially covers, mechanism unknown" — these must be resolved in de-risking.

**Gap Resolution:** After building the matrix, R4 (Progress indicator) has no ✅ cells — no element covers it.

Three options:

1. Add an element: Design "Progress Updater" that wires to the Bulk Inserter's batch callback → R4 now has ✅
2. Mark R4 as Out: "Progress indicator is nice-to-have, not core to the import workflow" → remove from matrix
3. Merge: R4 is actually part of R2 (Preview) — the preview already shows row count, which serves as progress → mark ✅ in Preview column

After any change, verify: every remaining R row still has ≥1 ✅. No gaps.

Interactive: Show the matrix to the user. "Does this coverage look right? Any gaps I'm missing?"

Step 6: De-Risk (Zero TBDs, Zero ⚠️ Allowed)

Walk through each use case in slow motion. For every element, ask:

1. Does this require technical work we've never done in this codebase?
2. Are we assuming parts fit together without verifying in code?
3. Is there a design decision that could stall the builder?
4. Can this be built within the appetite?

De-Risking Loop — for each ⚠️ flagged element:

1. Spike — investigate until the mechanism is clear: 1.1. State the exact question (e.g., "Can BulkInsert handle 10k rows?") 1.2. Investigate: read code, grep for patterns, check test files, look at similar features 1.3. Conclude: does the mechanism become clear?
2. If clear → update element to ✅ with specific code references
3. If not clear → choose ONE resolution action:
   • Declare Out of Bounds: Use case not worth supporting in this appetite (e.g., "No custom domain support in v1")
   • Cut Back: Feature not necessary for core value (e.g., remove optional UI elements)
   • Patch the Hole: Make the hard decision now, not during build (e.g., "Use simple list instead of grouped tree view")
4. Record the outcome in the Package's Rabbit Holes section
5. After all spikes are resolved → re-run the Fit Check matrix. If you cut or changed elements, the matrix must still have full R coverage. If any R row lost its ✅, add a new element or mark R as Out.

Every ⚠️ must become ✅ or be resolved through step 3. No ⚠️ elements can remain in the final Package — unresolved unknowns detonate during build.

Validate: Run the validation script:

PROJECT_ROOT="${CLAUDE_PROJECT_DIR:-$(pwd)}"
PLUGIN_ROOT="${CLAUDE_PLUGIN_ROOT:-$(find "$HOME/.claude" -type d -name shapeup-workflow 2>/dev/null | head -1)}"
SKILL_DIR="$PLUGIN_ROOT/skills/shape"
SHAPEUP_DIR="$PROJECT_ROOT/.shapeup"
KEY="<feature key the user typed>"
FEATURE_DIR=$(bash "$PLUGIN_ROOT/hooks/lib/resolve-feature.sh" "$SHAPEUP_DIR" "$KEY")
bash "$SKILL_DIR/scripts/validate-package.sh" "$FEATURE_DIR/package.md"

If any TBD/TODO/FIXME strings remain, resolve them before proceeding.

Step 7: Produce Package Document

Write the Package to <feature-dir>/package.md — using the $FEATURE_DIR resolved in Step 0.

Choose the template based on appetite. Medium Batch (2-3 sessions) uses the Big Batch template.

Small Batch Template (1 session)

For Small Batch features, use this condensed format. Affordance tables are replaced with a simpler changes table, but the fit check is kept inline to catch solution gaps.

# Package: <Project Name>

**Feature ID**: <NNN>
**Created**: <date>
**Frame**: <link to frame.md>
**Appetite**: Small Batch (1 session)
**Status**: Shaping

---

## Problem

<From frame.md — the specific pain point and baseline>

## Requirements

- **R0**: <Core goal>
- **R1**: <Must-have>
- **R2**: <Must-have>

## Solution

<Overview of the approach — 2-3 sentences>

### Changes

| File / Module | Change | Serves |
|---------------|--------|--------|
| <path> | <what changes> | R0, R1 |
| <path> | <what changes> | R2 |

**Fit check**: Every R above maps to at least one change. No gaps.

## Rabbit Holes

- **<Risk>**: <Resolution>

## No-Gos

- **<Exclusion>**: <Reason>

## Technical Validation

**Key files reviewed**: <list>
**Approach validated**: <summary of feasibility confirmation>
**Test strategy**: <TDD approach>

---

## Status: Shaping

Big Batch Template (4-5 sessions)

For Big Batch features, use the full template with affordance tables and fit check matrix.

# Package: <Project Name>

**Feature ID**: <NNN>
**Created**: <date>
**Frame**: <link to frame.md>
**Status**: Shaping

---

## Problem

<From frame.md — the specific pain point and baseline>

## Appetite

<Small Batch (1 session) / Medium Batch (2-3 sessions) / Big Batch (4-5 sessions)>

## Requirements (R)

| ID | Requirement | Status |
|----|-------------|--------|
| R0 | <Core goal> | Core goal |
| R1 | <Requirement> | Must-have |
| R2 | <Requirement> | Must-have |
| R3 | <Requirement> | Nice-to-have |

## Solution

<Overview of the approach — 2-3 sentences describing the strategy>

### Element: <Name>
**What**: <description>
**Where**: <file paths in codebase>
**Wiring**: <how it connects>
**Affected code**: <specific files>
**Status**: ✅ Validated

#### Place: <Screen/View Name>

**UI Affordances:**
| Affordance | Type | Wires Out | Returns To |
|------------|------|-----------|------------|
| <affordance> | <type> | <what it triggers> | <where result goes> |

**Code Affordances:**
| Affordance | Type | Wires Out | Returns To |
|------------|------|-----------|------------|
| <function> | <type> | <what it calls> | <what it returns> |

### Element: <Name>
<repeat for each element>

## Fit Check (R × Solution)

| | Element: <A> | Element: <B> | Element: <C> |
|---|---|---|---|
| R0: <Core goal> | ✅ | | ✅ |
| R1: <Requirement> | | ✅ | |
| R2: <Requirement> | ✅ | | |

<Every R row has ≥1 ✅. No gaps.>

## Rabbit Holes

<For each identified risk and its resolution>

- **<Risk>**: <Resolution — patched / cut / declared out of bounds>
  - Details: <what was decided and why>
- **<Risk>**: <Resolution>

## No-Gos

<Explicit exclusions — what is NOT included and why>

- **<Exclusion>**: <Reason>
- **<Exclusion>**: <Reason>

## Technical Validation

**Codebase reviewed**: <list of key files examined>
**Approach validated**: <summary of technical feasibility confirmation>
**Flagged unknowns resolved**: <all ⚠️ → ✅ or cut>
**Test strategy**: <how the solution will be tested — TDD approach>

---

## Status: Shaping

Step 8: Present and Gate (Shape Go)

1. Display the Package document to the user

2. Use AskUserQuestion for Shape Go:

   • Question: "Is the technical solution viable? Are all unknowns resolved?"
   • Options:
     • "Shape Go — Solution is solid, ready to build"
     • "Needs more work — Specific concerns to address"
     • "Back to framing — Problem needs reframing"
     • "Discard — Not feasible within appetite"

3. Based on response:

   • Shape Go: Before renaming, validate the package is clean:

     PROJECT_ROOT="${CLAUDE_PROJECT_DIR:-$(pwd)}"
     PLUGIN_ROOT="${CLAUDE_PLUGIN_ROOT:-$(find "$HOME/.claude" -type d -name shapeup-workflow 2>/dev/null | head -1)}"
     SKILL_DIR="$PLUGIN_ROOT/skills/shape"
     SHAPEUP_DIR="$PROJECT_ROOT/.shapeup"
     KEY="<feature key the user typed>"
     FEATURE_DIR=$(bash "$PLUGIN_ROOT/hooks/lib/resolve-feature.sh" "$SHAPEUP_DIR" "$KEY")
     bash "$SKILL_DIR/scripts/validate-package.sh" "$FEATURE_DIR/package.md"
     

     If the script exits non-zero, resolve every reported issue and re-run. Do not rename the folder until the validation passes.

     Then update package.md status to Status: Shape Go — approved <date> and rename:

     PROJECT_ROOT="${CLAUDE_PROJECT_DIR:-$(pwd)}"
     PLUGIN_ROOT="${CLAUDE_PLUGIN_ROOT:-$(find "$HOME/.claude" -type d -name shapeup-workflow 2>/dev/null | head -1)}"
     SHAPEUP_DIR="$PROJECT_ROOT/.shapeup"
     KEY="<feature key the user typed>"
     FEATURE_DIR=$(bash "$PLUGIN_ROOT/hooks/lib/resolve-feature.sh" "$SHAPEUP_DIR" "$KEY")
     NEW=$(echo "$FEATURE_DIR" | sed 's/-framing$/-shaped/')
     mv "$FEATURE_DIR" "$NEW"
     

     (The folder key uses date-slug naming — 2026-04-20-csv-import-framing becomes 2026-04-20-csv-import-shaped. Legacy numeric folders work the same way.)

   • Needs more work: Address specific concerns, update package, re-present

   • Back to framing: Note findings, suggest reframing direction

   • Discard: Rename to -discarded, write discard-reason.md

4. Tell the user: "When ready to build, run /build <NNN>"

---

Anti-Patterns to Avoid

• Shaping without reading code: The #1 failure. Every element must reference actual files and modules.
• Leaving TBDs: Every rabbit hole must be resolved. "We'll figure it out during build" = time bomb.
• UI concepts without wiring: Describing what it looks like without how it connects = undershaped.
• Shaping before Frame Go: Always validate the Frame is approved before designing solutions.
• Over-specifying: Don't write wireframes or pixel-perfect specs. Leave room for builder creativity.
• Ignoring existing patterns: The codebase has conventions. Follow them, don't invent new ones.
• Orphaned fit checks: If you change elements during de-risking, re-run the R × Solution matrix. Gaps = bugs.