ba

ba

Purpose

Business Analyst agent — the ROOT FIX for "Claude works a lot but produces nothing." BA forces deep understanding of WHAT to build before any code is written. It asks probing questions, identifies hidden requirements, maps stakeholders, defines scope boundaries, and produces a structured Requirements Document.

Wrong requirements shipped correctly is the most expensive bug. BA's job is to prevent it — measure clarity (Step 2.5), measure completeness (Step 3.5), and measure cross-dimension consistency (Step 3.6) before handoff.

BA produces WHAT, not HOW. Never write code. Never plan implementation. Output is a Requirements Document → hand off to rune:plan for implementation planning.

Triggers

• Called by cook Phase 1 when task is product-oriented (not a simple bug fix)
• Called by scaffold Phase 1 before any project generation
• /rune ba <requirement> — manual invocation
• Auto-trigger: when user description is > 50 words OR contains business terms (users, revenue, workflow, integration)

Calls (outbound)

• scout (L2): scan existing codebase for context
• research (L3): look up similar products, APIs, integrations
• plan (L2): hand off Requirements Document for implementation planning
• brainstorm (L2): when multiple approaches exist for a requirement
• design (L2): when requirements include UI/UX components — hand off visual requirements

Called By (inbound)

• cook (L1): before Phase 2 PLAN, when task is non-trivial
• scaffold (L1): Phase 1, before any project generation
• plan (L2): when plan receives vague requirements
• mcp-builder (L2): requirements elicitation before MCP server design
• User: /rune ba direct invocation

Cross-Hub Connections

• ba → plan — ba produces requirements, plan produces implementation steps
• ba → brainstorm — ba calls brainstorm when multiple requirement approaches exist
• ba ↔ cook — cook calls ba for non-trivial tasks, ba feeds requirements into cook's pipeline
• ba → scaffold — scaffold requires ba output before project generation

Executable Steps

Step 1 — Intake & Classify

Read the user's request. Classify the requirement type:

Type	Signal	Depth
Feature Request	"add X", "build Y", "I want Z"	Full BA cycle (Steps 1-7)
Bug Fix	"broken", "error", "doesn't work"	Skip BA → direct to debug
Refactor	"clean up", "refactor", "restructure"	Light BA (Step 1 + Step 4 only)
Integration	"connect X to Y", "integrate with Z"	Full BA + API research
Greenfield	"new project", "build from scratch"	Full BA + market context

If Bug Fix → skip BA, route to cook/debug directly. If Refactor → light version (Step 1 + Step 4 only). Skip Steps 2, 2.5, 3, 5, 6.

If existing codebase → invoke rune:scout for context before proceeding.

Step 1.4 — Synthesis Trigger Check

Before proceeding to elicitation, check whether the requirements are already in context. Re-asking what the user already told you is the second-most expensive bug.

Activate Synthesis Mode instead of standard elicitation if ANY of:

Signal	Threshold
User pasted a spec / PRD / brief	> 200 words describing the feature
Conversation has > 1000 words on this feature	Sufficient context already gathered
User said "synthesize" / "I already explained" / "just write the spec"	Explicit synthesis request
Continuation — .rune/features/<name>/requirements.md exists with prior answers	Re-elicitation would duplicate
Issue tracker has filled-in template (problem, story, acceptance criteria)	Source already structured

In Synthesis Mode: extract answers from existing context, draft the Requirements Document with source citations for every section, then confirm rather than re-interview. Ask follow-ups ONLY on the 1-2 dimensions with genuine gaps. Skip steps 2, 2.5 if all 5 dimensions are filled or partial-but-acceptable.

Workflow detail + anti-patterns: references/synthesis-mode.md.

Step 1.5 — Out-of-Scope Match Check (READ)

Before any elicitation, check whether the request matches a concept previously rejected.

1. Glob .out-of-scope/*.md — if directory absent, skip silently.
2. For each file, parse YAML frontmatter (concept, aliases).
3. Build a token map (lowercased, split on - and whitespace).
4. Tokenize the user's request the same way.
5. Compute lexical overlap per concept; keep the top match's confidence (0.0–1.0).

Action by confidence:

Confidence	Verdict	Action
≥ 0.8	exact-match	Surface to user: "This matches a prior rejection (.out-of-scope/<slug>.md) — closed because [body's "Why out of scope" first sentence]. Do you still feel the same way?" Pause for user response before continuing.
0.5 – 0.79	similar	Mention inline: "This is similar to a prior rejection (<slug>). Would you like to review it before we proceed?" Continue regardless of answer.
< 0.5	no-match	Continue silently, no user-facing mention.

Emit outofscope.match signal with {concept, confidence, verdict} so downstream skills (cook, plan) inherit the context.

If verdict is exact-match AND user says "yes I still want it" → record their override reason in the Requirements Document ## Risks section AND mark priority_to_revisit: high in the existing .out-of-scope/<slug>.md (do NOT delete the file). The override forces the candidate up the revisit ladder; it doesn't erase the prior decision.

If verdict is exact-match AND user accepts the prior rejection → end the BA session with a one-line summary referencing the file. No further questions.

Format reference: references/out-of-scope-format.md.

Step 1.6 — Mid-Elicitation Reject WRITE Path

If the user explicitly rejects the feature at any point during elicitation (Steps 2-3) — common phrases: "scrap it", "actually nah, don't build this", "we won't do this", "kill the feature", "drop it" — STOP elicitation and write a .out-of-scope/<slug>.md record before ending the session.

Without this WRITE path, oral rejections vanish — the next session re-asks the same questions and the user has to re-reject. Step 1.5 (READ) only catches matches against existing files; Step 1.6 (WRITE) is what produces those files in the first place.

Mid-elicitation rejection MUST produce a `.out-of-scope/.md` file before session end. A rejection without a written record is a rejection that didn't happen.

Procedure:

1. Confirm rejection is durable, not deferral. Ask one clarifier:

   "Just to record this correctly: is this out of scope (project doesn't want this), or deferred (not now but maybe later)? Out-of-scope gets recorded so we don't re-litigate; deferred goes to backlog instead."

   • If deferred → route to backlog (no .out-of-scope/ write), end session with a one-line note
   • If out-of-scope → continue to step 2

2. Capture the durable reason. Ask:

   "What's the reason this is out of scope? (project scope, technical constraint, strategic decision — not a temporary circumstance)"

   If the user gives a temporary reason ("we're busy"), reframe: "That's a deferral — should I route to backlog instead?"

3. Generate slug (kebab-case, ≤40 chars, recognizable without opening the file).

4. Lexical-similarity check: Glob .out-of-scope/*.md, parse each frontmatter's concept + aliases, compute overlap. If any existing concept has ≥0.7 overlap → APPEND to that file's prior_requests list and mark rejected_by: ba for this round. Do NOT create a duplicate.

5. Write the file using the format in references/out-of-scope-format.md:

   • YAML frontmatter (concept, aliases, decision: rejected, rejected_at, rejected_by: ba, prior_requests, optional revisit_if)
   • Markdown body: concept name, "Why out of scope" (substantive reasoning from step 2), "What would change our mind" (if user volunteered signals)

6. Emit outofscope.recorded signal carrying {slug, rejected_by: ba, prior_requests_count} so downstream skills know a new rejection landed.

7. End BA session with one-line summary:

   "Recorded as out of scope in .out-of-scope/<slug>.md. Future similar requests will surface this. Override anytime by editing the file."

When NOT to write:

• User merely defers ("not now") → backlog, not .out-of-scope/
• User rejects a single requirement within a larger feature → adjust requirements doc Boundaries section, don't write a whole rejection file (the feature is still in scope)
• Bug rejections (already fixed, not reproducible) → not BA's job; route to incident or close the issue
• The match was already exact (≥0.8) and Step 1.5 surfaced it — user accepting the prior rejection just appends to prior_requests of the existing file (handled in Step 1.5 path)

Step 2.0 — Explore-First Pre-Check (HARD-GATE)

Before emitting ANY of the 5 elicitation questions, run the 4-item pre-check on each intended question:

1. Is the answer in package.json / pyproject.toml / Cargo.toml / go.mod / pom.xml?
2. Is the answer in README.md / CLAUDE.md / docs/?
3. Is it inferable from file extensions, directory structure, or config files?
4. Has the user answered it earlier in this conversation?

For every question Q the agent intends to ask, there MUST be prior tool-call evidence in the same session: - At least 1 Read / Glob / Grep related to Q's domain, OR - Explicit declaration: "Q cannot be answered from project artifacts because [specific reason]." Without one of these, Q is BLOCKED — re-route to inference.

The gate is "tried to infer" — not "must succeed in inferring." If the file genuinely doesn't have the answer, the attempt itself is the gate.

Cache inferred answers in the requirements doc:

**Inferred from package.json**: TypeScript 5.4, Next.js 14.2, React 18.3
**Inferred from .github/workflows/**: CI runs on PRs targeting main

Worked examples + edge cases: references/explore-first.md.

Step 2 — Requirement Elicitation (the "5 Questions")

Ask exactly 5 probing questions, ONE AT A TIME (not all at once):

1. WHO — "Who is the end user? What's their technical level? What are they doing right before and after using this feature?"
2. WHAT — "What specific outcome do they need? What does 'done' look like from the user's perspective?"
3. WHY — "Why do they need this? What problem does this solve? What happens if we don't build it?"
4. BOUNDARIES — "What should this NOT do? What's explicitly out of scope?"
5. CONSTRAINTS — "Any technical constraints? (existing APIs, performance requirements, security needs, deadlines)"

Do NOT skip questions. Do NOT answer your own questions. If user says "just build it" → respond with: "I'll build it better with 2 minutes of context. Question 1: [WHO]" Each question must be asked separately, wait for answer before next. Exception: if user provides a detailed spec/PRD → extract answers from it, confirm with user.

Question Discipline (MANDATORY)

Every question the user answers burns attention you don't get back. Protect it.

1. Max 5 questions total across the whole BA session. If you find yourself wanting a 6th, the answer is in the first 5 or you're stalling — re-read, don't re-ask.
2. Prefer yes/no or multiple-choice over open-ended. An open-ended question is a last resort when no reasonable option set exists.
   • BAD: "What auth strategy do you want?"
   • GOOD: "Auth: (a) email+password with JWT, (b) OAuth (Google/GitHub), (c) magic link, (d) I'll decide — pick one."
3. Never ask what you can infer. If the answer is in the repo, the user's message, or the classification from Step 1 — don't ask it.
   • Wrong stack? → read package.json, don't ask.
   • Wrong audience? → check the README, don't ask.
   • Wrong framework? → check config files, don't ask.
4. Cache the answer. Write each Q→A pair into the Requirements Document verbatim. If the user restarts the BA session on the same feature, reuse the cached answers — never re-ask what was already answered.
5. Bundle yes/no questions after Q1 if the user is concise. A user who replies "y" / "n" / "skip" in 1-2 words tolerates a bundle. A user who replies with paragraphs wants the slow pace — keep one-at-a-time.

Every Q should earn its slot: removing it must leave the Requirements Document materially worse. If it wouldn't, cut the question.

Structured Elicitation Frameworks

Choose the framework that fits the requirement type. Use it to STRUCTURE the 5 Questions above, not replace them.

Framework	When to Use	Structure
PICO	Clinical, research, data-driven, or A/B testing features	Population (who), Intervention (what change), Comparison (vs what), Outcome (measurable result)
INVEST	User stories for sprint-sized features	Independent, Negotiable, Valuable, Estimable, Small, Testable
Jobs-to-be-Done	Product features, user workflows	"When [situation], I want to [motivation] so I can [expected outcome]"

PICO Example (data feature):

P: Dashboard users monitoring real-time metrics
I: Add anomaly detection alerts
C: vs. current manual threshold setting
O: 30% faster incident detection (measurable KPI)

When to apply which:

• Feature Request → INVEST (ensures stories are sprint-ready)
• Data/Analytics/Research feature → PICO (forces measurable outcome definition)
• Product/UX feature → Jobs-to-be-Done (keeps focus on user motivation)
• Integration → 5 Questions only (frameworks add noise for plumbing tasks)

Step 2.5 — Ambiguity Scoring (Execution Gate)

After each question round, compute an Ambiguity Score to determine if requirements are clear enough to proceed. This prevents premature handoff to plan with vague inputs.

Scoring Formula

Ambiguity = 1 - weighted_average(dimensions)

Dimensions (weights vary by requirement type):
  Greenfield:  Goal (40%) + Constraints (30%) + Success Criteria (30%)
  Feature:     Goal (30%) + Constraints (30%) + Success Criteria (20%) + Integration (20%)
  Integration: Goal (20%) + Constraints (25%) + Success Criteria (20%) + API Contract (35%)

Dimension Scoring (0.0 – 1.0)

Dimension	0.0 (Unknown)	0.5 (Partial)	1.0 (Clear)
Goal	"Make it better"	"Improve dashboard performance"	"Dashboard loads in <2s with 10k rows"
Constraints	No constraints mentioned	"Use existing DB"	"PostgreSQL 15, no new deps, GDPR compliant"
Success Criteria	"It should work"	"Users can see their data"	"AC-1.1: GIVEN 10k rows WHEN page loads THEN render <2s"
Integration	"Connect to the API"	"Use REST, need auth"	"POST /api/v2/orders, OAuth2, rate limit 100/min"
API Contract	"It sends data somewhere"	"JSON payload to endpoint"	"OpenAPI spec provided, request/response schemas defined"

Threshold Gate

Ambiguity	Level	Action
< 15%	Crystal Clear	Proceed to Step 3 immediately
15-25%	Acceptable	Proceed with noted assumptions — flag gaps in Requirements Doc
25-40%	Unclear	Ask 1-2 targeted follow-up questions on weakest dimension
> 40%	Blocked	Do NOT proceed. Re-ask the weakest dimension question with examples

NEVER hand off to plan with Ambiguity > 40%. If user insists "just build it" at > 40%, respond: "Ambiguity is [X]% — the weakest area is [dimension]. One more answer cuts this in half: [targeted question]"

Scoring After Each Question

After each of the 5 Questions (Step 2), update the score:

Round 1 (WHO):    Goal ≈ 0.3, others = 0.0 → Ambiguity ≈ 91%
Round 2 (WHAT):   Goal ≈ 0.7, Success ≈ 0.3 → Ambiguity ≈ 72%
Round 3 (WHY):    Goal ≈ 0.9, Success ≈ 0.5 → Ambiguity ≈ 47%
Round 4 (BOUNDS): Constraints ≈ 0.6 → Ambiguity ≈ 30%
Round 5 (CONSTR): Constraints ≈ 0.9 → Ambiguity ≈ 12% ✅

If Ambiguity drops below 15% before all 5 questions are asked (e.g., user provides a detailed PRD), skip remaining questions and proceed. The gate is about clarity, not ceremony.

Display Format

After completing Step 2, show the user:

Clarity Score: [100 - ambiguity]%
  Goal:             [██████████] 0.9
  Constraints:      [████████░░] 0.8
  Success Criteria: [██████░░░░] 0.6  ← weakest
  Status: ACCEPTABLE (ambiguity 23%) — proceeding with noted gaps

Step 2.6 — CONTEXT.md Cross-Reference Gate

After elicitation, before hidden-requirement discovery, scan the user's answers for assertions about current behavior — phrasings like "the system X", "the code does X", "we already X", "right now it X".

For each such assertion:

1. Grep the codebase for evidence (function names, route handlers, schema definitions matching the asserted behavior).
2. Compare grep results to the user's claim.

Outcome	Action
Grep confirms claim	Proceed; record term in CONTEXT.md if domain-relevant
Grep contradicts claim	Surface the conflict immediately. "You said the system does X, but the code path I see does Y. Which is canonical?" Pause until resolved.
Grep returns nothing	Note as unverified; ask user for the file/function name; do not record in CONTEXT.md until verified

This gate prevents the agent from silently transcribing user-asserted behavior that contradicts code — a common source of "the docs say X but the code does Y" drift.

Step 3 — Hidden Requirement Discovery

After the 5 questions, analyze for requirements the user DIDN'T mention:

Technical hidden requirements:

• Authentication/authorization needed?
• Rate limiting needed?
• Data persistence needed? (what DB, what schema)
• Error handling strategy?
• Offline/fallback behavior?
• Mobile responsiveness?
• Accessibility requirements?
• Internationalization?

Business hidden requirements:

• What happens on failure? (graceful degradation)
• What data needs to be tracked? (analytics events)
• Who else is affected? (other teams, other systems)
• What are the edge cases? (empty state, max limits, concurrent access)
• Regulatory/compliance needs? (GDPR, PCI, HIPAA)

Present discovered hidden requirements to user: "I found N additional requirements you may not have considered: [list]. Which are relevant?"

Step 3.5 — Completeness Scoring (Options & Alternatives)

When presenting options, alternatives, or scope decisions to the user, rate each with a Completeness score (X/10):

Score	Meaning	Guidance
9-10	Complete — all edge cases, full coverage, production-ready	Always recommend
7-8	Covers happy path, skips some edges	Acceptable for MVP
4-6	Shortcut — defers significant work to later	Flag trade-off explicitly
1-3	Minimal viable, technical debt guaranteed	Only for time-critical emergencies

Always recommend the higher-completeness option unless the delta is truly expensive. With AI-assisted coding, the marginal cost of completeness is near-zero:

Task Type	Human Team	AI-Assisted	Compression
Boilerplate / scaffolding	2 days	15 min	~100x
Test writing	1 day	15 min	~50x
Feature implementation	1 week	30 min	~30x
Bug fix + regression test	4 hours	15 min	~20x

When showing effort estimates, always show both scales: (human: ~X / AI: ~Y). The compression ratio reframes "too expensive" into "15 minutes more."

Anti-pattern: "Choose B — it covers 90% of the value with less code." → If A is only 70 lines more, choose A. The last 10% is where production bugs hide.

Step 3.6 — Logic Consistency Check

After ambiguity + completeness pass, scan for cross-dimension contradictions. Ambiguity measures CLARITY of each dimension in isolation; this step measures CONSISTENCY across dimensions. A perfectly clear requirement can still contradict itself.

Checks

Run each, label verdict 🟢 pass / 🟡 warn / 🔴 fail:

#	Check	🔴 Fail	🟢 Pass
1	Every Acceptance Criterion traces to a User Story	AC orphaned	1:N mapping clear
2	Every Business Rule (Q5) is enforced in an AC or Exception Flow	Rule has no enforcement path	Rule → specific AC or exception
3	Scope IN ∩ Scope OUT = ∅	Direct overlap in phrasing	Sets disjoint
4	Every user-story flow has a terminal state	State loop without exit condition	Terminal state explicit
5	Dependencies (Step 4) ⊂ Constraints acknowledged (Q5)	Dependency never mentioned in constraints	All deps covered
6	NFRs measurable against at least one AC	NFR has no test hook	Every NFR → testable AC
7	Hidden requirements (Step 3) resolved in/out	Silent inclusion	User confirmed inclusion or exclusion
0	Prior rejection check (Step 1.5) — exact-match resolved with explicit override or session ended	Silent re-litigation of rejected concept	User chose: override (priority bumped) OR accept prior decision (session ends)

Output Format

Logic Consistency Report:
  1. AC → User Story:      🟢 all AC trace to US-1 or US-2
  2. Business rule → AC:   🟡 "no duplicate emails" cited — exception flow missing
  3. Scope disjoint:       🟢
  4. Terminal states:      🟢
  5. Deps in constraints:  🔴 "PostgreSQL 15" missing from Q5 answer
  6. NFR measurable:       🟢
  7. Hidden reqs resolved: 🟢

Verdict: 1 🔴, 1 🟡, 5 🟢 → BLOCK handoff until 🔴 fixed

Gate Rule

Result	Action
0 🔴	Proceed to Step 4 — 🟡 warnings become "Risks" in Requirements Doc
1-2 🔴	BLOCK — ask targeted question or re-scope to resolve each 🔴
3+ 🔴	Scrap Steps 2-3 and restart — requirements structurally incoherent

NEVER hand off to plan with unresolved 🔴. Ambiguity ≤ 40% does not imply consistency — they are orthogonal gates. If user pushes "just build it" with 🔴 present, respond: "Contradiction in [dimension]: [specific conflict]. One clarification fixes this: [targeted question]"

Step 4 — Scope Definition

Based on all gathered information, produce:

In-Scope (explicitly included):

• [list of features/behaviors that WILL be built]

Out-of-Scope (explicitly excluded):

• [list of things we WON'T build — prevents scope creep]

Assumptions (things we're assuming without proof):

• [each assumption is a risk if wrong]

Dependencies (things that must exist before we can build):

• [APIs, services, libraries, access, existing code]

Step 5 — User Stories & Acceptance Criteria

For each in-scope feature, generate:

US-1: As a [persona], I want to [action] so that [benefit]
  AC-1.1: GIVEN [context] WHEN [action] THEN [result]
  AC-1.2: GIVEN [error case] WHEN [action] THEN [error handling]
  AC-1.3: GIVEN [edge case] WHEN [action] THEN [graceful behavior]

Rules:

• Primary user story first, then edge cases
• Every user story has at least 2 acceptance criteria (happy path + error)
• Acceptance criteria are TESTABLE — they become test cases in Phase 3

Step 6 — Non-Functional Requirements (NFRs)

Assess and document ONLY relevant NFRs:

NFR	Requirement	Measurement
Performance	Page load < Xs, API response < Yms	Lighthouse, k6
Security	Auth required, input validation, OWASP top 10	sentinel scan
Scalability	Expected users, data volume	Load test target
Reliability	Uptime target, error budget	Monitoring threshold
Accessibility	WCAG 2.2 AA	Axe audit

Only include NFRs relevant to this specific task. Don't generate a generic checklist.

Step 6.5 — Tiered Recommendations

For product-oriented requirements (Feature Request, Integration, Greenfield), generate tiered strategic recommendations. This structures the path forward into actionable time horizons.

Three Tiers:

Tier	Timeframe	Focus	Characteristics
Quick Win	0-30 days	Immediate impact	Low effort, high visibility, builds momentum
Differentiation	1-3 months	Competitive edge	Medium effort, unique value, hard to copy
Long-term Moat	6-12 months	Sustainable advantage	High effort, defensible, compounds over time

For each tier, specify:

### Quick Win (0-30 days)
- **Action**: [Specific deliverable]
- **Resources**: [Team size, tools, dependencies]
- **Expected Impact**: [Measurable outcome]
- **Risk if skipped**: [What happens without this]

### Differentiation (1-3 months)
- **Action**: [...]
- **Resources**: [...]
- **Expected Impact**: [...]
- **Risk if skipped**: [...]

### Long-term Moat (6-12 months)
- **Action**: [...]
- **Resources**: [...]
- **Expected Impact**: [...]
- **Risk if skipped**: [...]

Rules:

• Quick Win MUST be achievable in first sprint — no dependencies on later tiers
• Differentiation should create switching costs or unique capabilities
• Long-term Moat should compound (network effects, data moats, ecosystem lock-in)
• Every tier includes "Risk if skipped" — makes trade-offs explicit
• Skip this step for Bug Fix and Refactor types (no strategic dimension)

Step 7 — Artifact Triad

Produce three structured artifacts — not one prose doc. Plan consumes all three; each answers a different question.

Artifact	Question Answered	Consumer
requirements.md	WHAT to build and WHY	plan, cook
requirements.mermaid	WHAT does the flow look like visually	plan, design, review
tasks.md	WHAT work layers exist	plan (as task backbone, not from scratch)

Artifact 1: requirements.md

Structured document combining Steps 1-6.5. Save to .rune/features/<feature-name>/requirements.md:

# Requirements Document: [Feature Name]
Created: [date] | BA Session: [summary]

## Context
[Problem statement — 2-3 sentences]

## Stakeholders
- Primary user: [who]
- Affected systems: [what]

## User Stories
[from Step 5]

## Scope
### In Scope
### Out of Scope
### Assumptions

## Non-Functional Requirements
[from Step 6]

## Dependencies
[from Step 4]

## Risks
- [risk]: [mitigation]

## Strategic Recommendations
[from Step 6.5 — skip for Bug Fix/Refactor]

## Logic Consistency Report
[from Step 3.6 — verbatim, for audit trail]

## Next Step
→ Hand off to rune:plan (consumes all 3 artifacts)

Artifact 2: requirements.mermaid

Auto-generate from User Stories. Save to .rune/features/<feature-name>/requirements.mermaid.

Sequence diagram (primary happy path from US-1):

sequenceDiagram
  actor User
  participant System
  participant Database
  User->>System: [action from US-1]
  System->>Database: [read/write from AC-1.1]
  Database-->>System: [response]
  System-->>User: [result from AC-1.1]

State machine (only if any User Story implies state):

stateDiagram-v2
  [*] --> initial
  initial --> processing: [trigger from AC]
  processing --> success: [happy path AC]
  processing --> failed: [error AC]
  success --> [*]
  failed --> initial: retry

Skip state machine if feature is stateless (simple CRUD with no lifecycle). Sequence is always produced.

Artifact 3: tasks.md

Pre-broken implementation tasks by layer. Plan refines this backbone, does not create from scratch. Save to .rune/features/<feature-name>/tasks.md:

# Implementation Tasks: [Feature Name]

## Data Layer
- [ ] Schema — [tables/models from AC]
- [ ] Migration up + down
- [ ] Seed/fixtures if tests need them

## Logic Layer
- [ ] [each Q5 Business Rule → one task]
- [ ] Validation for [each AC error case]
- [ ] State transitions from requirements.mermaid (if present)

## Interface Layer (API / UI)
- [ ] [each User Story → one endpoint or UI component]
- [ ] Contract schema from AC (request/response)
- [ ] Error handling for [each AC error]

## Test Layer
- [ ] Unit: [each business rule → one test]
- [ ] Integration: [each AC happy path]
- [ ] Regression: [each AC error case]

## NFR Verification
- [ ] [each NFR from Step 6 → one measurement task]

Derivation rules:

• 1 User Story → ≥1 Interface task
• 1 Business Rule → 1 Logic task + 1 Unit test task
• 1 AC → ≥1 Test task (happy path + error)
• 1 NFR → 1 NFR Verification task

Handoff

Emit signal to plan with paths to all three artifacts. Plan MUST read all three before producing phase files — the triad is the contract.

Step 7.5 — Glossary Sharpen (CONTEXT.md update)

After the artifact triad is saved, append/update the project glossary CONTEXT.md with any domain terms that were sharpened during this session.

1. Determine glossary location:
   • If CONTEXT-MAP.md exists at root → multi-context; pick the right per-context CONTEXT.md
   • Else if root CONTEXT.md exists → use it
   • Else if any term needs recording → create root CONTEXT.md lazily
   • Else → skip silently (no-op when no terms emerged)
2. For each new term, add a row to the Language table (term, definition, aliases-to-avoid, status).
3. For each user-asserted relationship, add to the Relationships section.
4. For each ambiguity surfaced during elicitation, add to Flagged ambiguities.

Conflict gate — if a new term has ≥0.7 token overlap with an existing one, surface to user (merge / rename / keep distinct). NEVER silently re-define an existing term.

Format reference: references/context-md-format.md.

Output Format

Triad of artifacts under .rune/features/<feature-name>/:

File	Template Reference
requirements.md	Step 7 Artifact 1
requirements.mermaid	Step 7 Artifact 2 (sequence + optional state machine)
tasks.md	Step 7 Artifact 3 (Data / Logic / Interface / Test / NFR layers)

Inside requirements.md the Decision Classification table MUST appear verbatim — plan gates on Decision compliance, Discretion items skip approval:

Category	Meaning	Example
Decisions (locked)	User confirmed — agent MUST follow	"Use PostgreSQL, not MongoDB"
Discretion (agent decides)	User trusts agent judgment	"Pick the best validation library"
Deferred (out of scope)	Explicitly NOT this task	"Mobile app — future phase"

Constraints

1. MUST ask up to 5 probing questions before producing requirements — never more, skip any you can infer from context
2. MUST prefer yes/no or multiple-choice questions — open-ended only when no reasonable option set exists
3. MUST NOT ask for information already present in the user's message, the repo, or classification — read/grep first, ask second
4. MUST cache each Q→A pair in the Requirements Document and reuse on subsequent BA sessions for the same feature
5. MUST identify hidden requirements — the obvious ones are never the full picture
6. MUST define out-of-scope explicitly — prevents scope creep
7. MUST produce testable acceptance criteria — they become test cases
8. MUST NOT write code or plan implementation — BA produces WHAT, plan produces HOW
9. MUST ask ONE question at a time by default; bundle yes/no batches only after user shows concise replies
10. MUST NOT skip BA for non-trivial tasks — "just build it" gets redirected to Question 1

Returns

Artifact	Format	Location
Requirements document	Markdown	.rune/features/<feature-name>/requirements.md
Visual model	Mermaid (sequence + optional state machine)	.rune/features/<feature-name>/requirements.mermaid
Implementation task backbone	Markdown checklist by layer	.rune/features/<feature-name>/tasks.md
Logic Consistency Report	Markdown section	Embedded in requirements.md
Ambiguity + Completeness scores	Markdown display blocks	Embedded in requirements.md

Sharp Edges

Known failure modes for this skill. Check these before declaring done.

Failure Mode	Severity	Mitigation
Skipping questions because "requirements are obvious"	CRITICAL	HARD-GATE: 5 questions mandatory, even for "simple" tasks
Answering own questions instead of asking user	HIGH	Questions require USER input — BA doesn't guess
Producing implementation details (HOW) instead of requirements (WHAT)	HIGH	BA outputs requirements doc → plan outputs implementation
All-at-once question dump (asking 5 questions in one message)	MEDIUM	One question at a time, wait for answer before next
Asking open-ended questions when yes/no or multiple-choice would work	HIGH	Question Discipline rule 2 — option sets are faster to answer and easier to cache
Asking for info already in the repo/message (stack, framework, audience)	HIGH	Question Discipline rule 3 — read package.json/README/config first, ask only what you genuinely can't find
Exceeding 5 questions when the user seems "engaged"	MEDIUM	Question Discipline rule 1 — hard cap at 5. A 6th question is a sign of stalling, not thoroughness
Re-asking on session restart when answers were cached	MEDIUM	Question Discipline rule 4 — load .rune/features/<name>/requirements.md and reuse cached Q→A pairs
Missing hidden requirements (auth, error handling, edge cases)	HIGH	Step 3 checklist is mandatory scan
Requirements doc too verbose (>500 lines)	MEDIUM	Max 200 lines — concise, actionable, testable
Skipping BA for "simple" features that turn out complex	HIGH	Let cook's complexity detection trigger BA, not user judgment
Recommending shortcuts without Completeness Score	MEDIUM	Step 3.5: every option needs X/10 score + dual effort estimate (human vs AI). "90% coverage" is a red flag when 100% costs 15 min more
Handing off to plan with ambiguity > 40%	CRITICAL	Step 2.5 HARD-GATE: compute ambiguity score after elicitation, block handoff if > 40%, ask targeted follow-up on weakest dimension
Skipping ambiguity scoring because "user seems clear"	HIGH	Always compute the score — perceived clarity ≠ measured clarity. The formula catches gaps humans miss
Tiered recommendations too vague ("improve things")	MEDIUM	Each tier needs specific Action + measurable Expected Impact. "Build better UX" → "Reduce checkout steps from 5 to 3, targeting 15% conversion lift"
All three tiers have same resources/effort	MEDIUM	Quick Win should be low-effort. If all tiers need "2 engineers, 3 months" → re-scope Quick Win to something achievable in 1 sprint
Skipping Logic Consistency check because ambiguity is low	CRITICAL	Step 3.6 HARD-GATE: clarity ≠ consistency. A 90% clarity spec can still contain pairwise contradictions (scope IN/OUT overlap, rules with no enforcement, orphan ACs)
Handing off to plan with unresolved 🔴 consistency fails	CRITICAL	Step 3.6 gate: 1+ 🔴 = BLOCK. 🟡 allowed only when logged as Risk in requirements.md
Producing only requirements.md, skipping mermaid and tasks.md	HIGH	Step 7 is a triad — plan's contract expects all 3. Sequence diagram is always produced; state machine only if stateful; tasks.md always produced
Mermaid diagram unrelated to actual user stories (decorative only)	MEDIUM	Sequence must trace AC-1.1 of US-1; state machine nodes must map to state-bearing ACs. Auditable by pattern-match
tasks.md as flat list instead of layered	MEDIUM	Derivation rules enforce 1 US → Interface task, 1 rule → Logic + Unit test, 1 AC → Test task, 1 NFR → verification. Skipping layers loses plan's backbone structure
Re-litigating a previously rejected concept without surfacing it	HIGH	Step 1.5 HARD-GATE: scan .out-of-scope/ first; exact match (≥0.8) MUST be surfaced before elicitation begins
Skipping Step 1.5 because .out-of-scope/ directory looks empty	MEDIUM	Empty directory is silent-skip OK; directory absent entirely is silent-skip OK; never skip due to "I don't think this matches anything" — let the matcher decide
User asserts behavior; agent records user's version without grep verification	HIGH	Step 2.6 HARD-GATE: every "the system does X" assertion gets grep'd; conflicts surface to user before recording
Silently re-defining an existing CONTEXT.md term	HIGH	Step 7.5 conflict gate: ≥0.7 overlap → user chooses merge/rename/keep-distinct
Auto-creating an empty CONTEXT.md when no terms emerged	LOW	Lazy creation rule: only write when there's a non-trivial term to record
Mid-elicitation rejection ("scrap it") that ends the session without writing .out-of-scope/	CRITICAL	Step 1.6 HARD-GATE: explicit rejection MUST produce .out-of-scope/<slug>.md before session end — oral rejections vanish, force re-litigation next session
Writing .out-of-scope/ for a deferral instead of routing to backlog	MEDIUM	Step 1.6 procedure step 1: confirm "out of scope" vs "deferred" — temporary reasons go to backlog, not the rejection KB
Running 5-question elicitation when conversation already contains rich context	HIGH	Step 1.4: synthesis-trigger check fires before Step 2 — pasted spec / >1000 words / continuation / explicit "synthesize" → switch to Synthesis Mode (extract + cite + confirm), don't re-interview
Synthesizing requirements without source citations	HIGH	Synthesis Mode requires citing source for every dimension (user message N, pasted doc, continuation file). User cannot verify interpretation without citations
Auto-handoff to plan after synthesis without explicit user "go"/"locked" confirmation	HIGH	Synthesis is interpretation, not transcription. Without explicit confirmation, drift becomes a downstream bug
Asking inferable questions ("what stack are you using?") without first checking package.json	HIGH	Step 2.0 HARD-GATE — every question requires prior tool-call evidence (Read/Glob/Grep) or explicit unavailability declaration
Re-asking a question already answered earlier in the conversation	MEDIUM	Step 2.0 check 4 — cache and reuse, never re-ask

Done When

• Requirement type classified (feature/refactor/integration/greenfield)
• 5 probing questions asked and answered (or extracted from spec/PRD)
• Ambiguity Score computed and displayed — must be ≤ 40% before proceeding (≤ 25% preferred)
• Hidden requirements discovered and confirmed with user
• Scope defined (in/out/assumptions/dependencies)
• User stories with testable acceptance criteria produced
• Non-functional requirements assessed (relevant ones only)
• Logic Consistency Report produced — 0 🔴 before handoff (🟡 logged as Risks)
• Tiered recommendations generated (Quick Win / Differentiation / Moat) — skip for Bug Fix/Refactor
• Artifact triad saved: requirements.md + requirements.mermaid + tasks.md
• Out-of-scope match check completed (verdict logged: no-match | similar | exact-match-overridden | exact-match-accepted)
• Handed off to plan for implementation planning

Cost Profile

~3000-6000 tokens input, ~1500-3000 tokens output. Opus for deep requirement analysis — understanding WHAT to build is the most expensive mistake to get wrong.