Harness Strategy

Harness Strategy

Repo-root strategic anchor. Phase 2 of the strategic-anchor spec ships the skill: a first-run interview that writes a valid STRATEGY.md, plus an update flow that re-interviews one section at a time with pushback against fluff, goals-as-strategy, and feature-lists-as-strategy. Downstream wiring (init, brainstorming, roadmap-pilot, ideate, knowledge graph) ships in spec Phases 3-7.

When to Use

• Manually, when a project wants a durable upstream product anchor that survives across milestones and phases
• When STRATEGY.md is absent and the user invokes /harness:strategy
• When STRATEGY.md exists and the user wants to update one section (the user picks which one; nothing is auto-rewritten)
• NOT for tactical phase tracking — that's docs/roadmap.md (kept deliberately separate; see proposal Decision 1)
• NOT for generating strategy from code or commit history — strategy is a human commitment, never a derived artifact (proposal Decision 8)
• NOT for producing specs/plans/code — those are harness-brainstorming's job; this skill only writes STRATEGY.md

Process

Iron Law

The skill never writes STRATEGY.md without explicit user confirmation of the assembled doc, and never silently accepts an answer that fails a pushback rule on the FIRST round. The 2-round cap is the capitulation point, not the bypass point — round 1 must always fire when a rule matches.

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Phase 0: ROUTE BY FILE STATE

1. Locate STRATEGY.md at repo root. Use path.join(process.cwd(), 'STRATEGY.md').
2. Call validate_strategy({ path: process.cwd() }) via the harness MCP server. It returns { present, valid, error? }. The MCP server already has @harness-engineering/core loaded, so the project does not need it installed.
   • { present: false } → proceed to Phase 1 (first-run interview).
   • { present: true, valid: true } → proceed to Phase 2 (update run).
   • { present: true, valid: false, error } → surface error verbatim, then offer three paths via emit_interaction (or numbered chat options when MCP is unavailable):
     • a) Fix the offending section now via the update flow → proceed to Phase 2 with the broken section pre-selected.
     • b) Move file to STRATEGY.md.bak.<YYYY-MM-DD-HHmm> and run Phase 1 fresh.
     • c) Exit; user repairs manually. No further action.

The skill MUST NOT auto-overwrite a present-but-invalid STRATEGY.md — that's the user's prior work, even if broken. The three-path offer is the contract.

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Phase 1: FIRST-RUN INTERVIEW

Read references/interview.md for the three pushback rules and the 2-round cap. Both are mandatory.

Walk sections in template order — never out of order, because each section informs the next:

1. Target problem. Open with: "In 2-4 sentences: what is specifically broken in the world that this product addresses? Not the goal — the diagnosis." Capture. Apply Fluff detection and Goal-as-strategy rules.

2. Our approach. Open with: "What is your distinctive bet on how to solve the target problem? The choice you're making about HOW, not WHAT you're building." Apply all three rules (Fluff, Goal-as-strategy, Feature-list-as-strategy) — this is where feature-list answers live.

3. Who it's for. Open with: "Specific persona — who is the person, what context are they in, what alternatives are they currently using? 'Developers' is not a specific persona." Apply Fluff detection.

4. Key metrics. Open with: "What 1-5 metrics, measured where, would tell you the bet is paying off? Each metric is a bullet line: - <name>: <how measured, where it lives>." Apply Fluff detection per bullet.

5. Tracks. Open with: "What 1-5 tracks of work are you currently investing in to advance the bet? Each track is a bullet line: - <track name>: <one-sentence current investment>." Apply Feature-list-as-strategy per bullet (a "track" should be an investment direction, not a feature name).

6. Optional sections. Ask once whether to add Milestones, Not working on, and/or Marketing. If yes, walk each with the same rules. If no, skip — they remain absent (the schema allows omission).

7. Assemble. Show the full proposed doc. Ask explicitly: "Write this to STRATEGY.md?" Wait for yes/no.

8. Write. Call write_strategy({ path: process.cwd(), doc }) via the harness MCP server. The doc argument is the assembled StrategyDoc shape: { frontmatter: { name, last_updated, version }, sections: [{ name, body }, ...] }. Set last_updated to today's ISO date; version to 1 for first run. The MCP tool validates against StrategyDocSchema and refuses to touch disk on schema failure. Passing the doc as a JSON parameter (not through a shell) means user-supplied prose never crosses the shell tokenizer — no quoting, backtick, or $VAR hazard. Fallback for environments without the MCP server: shell out to node -e "import('@harness-engineering/core').then(m => m.writeStrategyDoc(JSON.parse(require('fs').readFileSync(0, 'utf-8')), { cwd: process.cwd() }))" with the doc piped on stdin — but only when @harness-engineering/core is resolvable from the project's node_modules.

9. Validate. Run harness validate to confirm the file passes StrategyDocSchema. On failure, surface the error and stop (do not retry).

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Phase 2: UPDATE RUN

1. Re-read the existing file via read_strategy({ path: process.cwd() }) on the harness MCP server. It returns { present: true, valid: true, doc } with the parsed StrategyDoc shape; the server runs validateStrategy + parseStrategyDoc + asStrategyDoc internally so the project does not need @harness-engineering/core installed.
2. Summarize current state in 3-5 lines: frontmatter (name, last_updated, version), then the first sentence of each present section. This is the "what's there now" view the user needs to choose what to revisit.
3. Ask which section to revisit. Present the section names as numbered options. Allow none (exit) or multiple (sequential re-interviews).
4. Re-interview each selected section with the same pushback rules and 2-round cap from Phase 1. Do not re-ask sections the user did not select.
5. Bump frontmatter. Set last_updated to today's ISO date. Increment version by 1.
6. Confirm and write. Show the diff between the parsed doc and the new doc (added/changed sections). Ask explicitly: "Write the update?" Wait for yes/no. Call write_strategy (same pattern as Phase 1.8). The writer preserves the user's H1 line and writes a .bak only if no .bak exists yet (idempotent — the original pre-strategy file is the rollback target).
7. Validate. Run harness validate.

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Phase 3: DOWNSTREAM HANDOFF

After Phase 1 or Phase 2 completes successfully, print this short note (3-5 lines):

STRATEGY.md written. Downstream skills that pick this up as grounding:
  - harness-brainstorming     (Phase 5 of strategic-anchor spec — reads STRATEGY.md in Phase 1 EXPLORE)
  - harness-ideate            (Phase 4 of spec — generates ranked candidates grounded in STRATEGY.md)
  - harness-roadmap-pilot     (Phase 6 of spec — strategy-alignment tiebreaker)
  - BusinessKnowledgeIngestor (Phase 7 of spec — strategy domain → business_fact nodes)
Soft-fail when absent; no downstream skill blocks on STRATEGY.md's presence.

The handoff exists to set the user's expectation about why they just answered those questions. It is short by design — this is not a section to grow.

Harness Integration

• harness validate — Run after write_strategy; the existing validateStrategy helper (Phase 1 of this spec) catches schema violations.
• Harness MCP tools consumed by this skill (canonical execution path — works without @harness-engineering/core in the project's node_modules):
  • validate_strategy({ path }) — Phase 0's routing oracle. Returns { present, valid, error? }.
  • read_strategy({ path }) — Phase 2's read path. Returns { present, valid, doc?, error? }.
  • write_strategy({ path, doc, skipBackup? }) — atomic disk write with .bak on first overwrite. Validates against StrategyDocSchema before touching disk.
• @harness-engineering/core primitives the MCP tools wrap (only directly relevant when developing inside the monorepo or when the MCP server is unavailable):
  • validateStrategy(cwd), parseStrategyDoc(raw) + asStrategyDoc(parsed), writeStrategyDoc(doc, { cwd, skipBackup? }), serializeStrategyDoc(doc, opts?), StrategyDocSchema.
• Boundary with harness-pulse — Pulse reads STRATEGY.md to seed metric names; strategy writes it. Pulse NEVER writes to STRATEGY.md (Decision 6 of the feedback-loops spec). Strategy NEVER touches harness.config.json.
• Boundary with harness-brainstorming — Brainstorming consumes STRATEGY.md as grounding context; this skill produces it. Phase 5 of the strategic-anchor spec wires the brainstorming read path.
• Decision 1 (separation from roadmap.md) — docs/roadmap.md is tactical phase tracking; STRATEGY.md is the strategic anchor. They never merge. Documented in references/interview.md.
• Decision 2 (placeholder rejection) — A STRATEGY.md with the template placeholder text (e.g., <2-4 sentences. ...>) still in it FAILS validation. The skill never writes placeholder text; the writer validates before touching disk.

Success Criteria

• On a project with no STRATEGY.md, the first-run interview produces a valid STRATEGY.md ≤ 100 lines that passes harness validate.
• Re-running the skill on a project with a valid STRATEGY.md enters Phase 2 (update), preserves sections the user did not touch verbatim, bumps version, and updates last_updated.
• All three pushback rules (Fluff detection, Goal-as-strategy, Feature-list-as-strategy) fire on at least one canonical anti-pattern fixture in references/interview.md.
• After Phase 1 or 2, harness validate passes.
• A STRATEGY.md.bak is written on the first overwrite of an existing file, but NOT clobbered on subsequent overwrites (idempotency).
• A present-but-invalid STRATEGY.md surfaces the validation error and offers the three repair paths from Phase 0; the skill never auto-overwrites a present-but-invalid file.

Examples

Example: greenfield (no STRATEGY.md)

• Phase 0: validate_strategy returns { present: false, valid: true }; route to Phase 1.
• Phase 1.1: ask Target problem. User answers "engineering teams want to be the best at shipping". Fluff detection fires: "be the best at" is empty-modifier vocabulary. Repair suggestion: "Replace be the best at shipping with a concrete diagnosis." User revises: "engineering teams ship without a strategic anchor; brainstorming starts mid-stream". Accepted.
• Phase 1.2-5: walk Our approach, Who it's for, Key metrics, Tracks with the same pushback discipline.
• Phase 1.6: user declines optional sections.
• Phase 1.7: show full doc; user confirms.
• Phase 1.8: write_strategy writes the file; no .bak written (fresh create).
• Phase 1.9: harness validate passes.
• Phase 3: handoff note printed.

Example: update existing STRATEGY.md (one section)

• Phase 0: validate_strategy returns { present: true, valid: true }; route to Phase 2.
• Phase 2.1-2: parse and summarize. Current state shows name: Acme, last_updated: 2026-05-01, version: 3 and 5 required sections.
• Phase 2.3: user selects Tracks for revisit.
• Phase 2.4: re-interview Tracks. User answers "add features X, Y, Z to the dashboard". Feature-list-as-strategy fires: 3+ feature names. Repair suggestion: "What's the coherent action these features are instances of?" User revises: "- Dashboard track: collapse 3 separate widgets into one explorable surface". Accepted.
• Phase 2.5: frontmatter bumped to last_updated: 2026-06-02, version: 4.
• Phase 2.6: show diff; user confirms. write_strategy writes the file; .bak already exists from a prior overwrite — NOT clobbered.
• Phase 2.7: harness validate passes.

Example: present-but-invalid STRATEGY.md

• Phase 0: validate_strategy returns an error like section "Key metrics": unfilled template placeholder detected (- <metric 1>: <how it's measured, where it lives>). Surface verbatim.
• User picks a) Fix now: skill enters Phase 2 with Key metrics pre-selected. User answers; skill writes the file.

Example: pushback gives up after the cap

• Phase 1.1: ask Target problem. User answers "deliver value". Fluff detection fires. Round 1: suggest repair. User answers "deliver maximum value". Round 2: suggest repair again. User answers "deliver excellent value". Cap reached — skill captures the answer verbatim AND emits a flag in the doc summary: "⚠ Target problem: flagged for revisit — pushback cap reached without concrete diagnosis." Continue to the next section.

Gates

• The 2-round pushback cap is non-negotiable. No flag, no override, no "I know what I'm doing" path — the cap is the disable mechanism (proposal §Risks).
• The skill MUST NEVER write to STRATEGY.md without explicit user confirmation of the assembled or updated doc.
• write_strategy (or writeStrategyDoc when invoked directly) is the only sanctioned write path. Do not hand-edit STRATEGY.md. The writer is the layer that validates against the schema, preserves the H1, writes the .bak, and does the atomic rename.
• harness validate must pass before exit of Phase 1 or Phase 2. A malformed STRATEGY.md silently breaks the downstream grounding reads (Phases 5/6/7 of the spec).
• Round 1 pushback MUST always fire when a rule matches. The cap protects users from infinite loops, not from feedback. Skipping round 1 violates the Iron Law.

Escalation

• User insists pushback is wrong: Capture the answer verbatim after round 1 (do not push back twice if the user explicitly disagrees with round 1). Surface a one-line flag in the doc summary. Continue.
• write_strategy returns { written: false, error } (or writeStrategyDoc throws a schema error directly): Report the error verbatim. Do not retry without user fix. The most common cause is a section body that's empty or still contains template placeholder text.
• STRATEGY.md frontmatter is malformed (Phase 2): Treat as present-but-invalid; route through Phase 0's three-path offer.
• User wants to add a section name not in the documented schema: Refuse and cite Decision 2 of the proposal ("schema validation rejects unknown sections; expansion requires a separate ADR"). Offer to file the proposal ADR as a follow-up.
• Atomic rename fails (e.g., permission denied): Surface the filesystem error verbatim. The temp file is cleaned up by the writer; no partial STRATEGY.md is left behind.