fix(skills): capture worktree path before Step 5 changes directory

Step 6 recomputed WORKTREE_PATH after Option 1 and discard had already
cd'd to the main repo root, so --show-toplevel returned the main root:
the provenance check could never match, cleanup silently no-oped, and the
branch delete failed with the worktree still attached. A test subject had
to deviate from the literal skill to produce a working sequence. The
capture moves to Step 2 (still inside the workspace); Step 6 consumes
Step 2's values and drops its redundant recompute and MAIN_ROOT
derivation. Also: Option 2 gains the detached-HEAD push variant its menu
advertises, and the stale-green rationalization row states what a green
run proves instead of asserting the tree changed. Re-verified: merge-flow
and discard-flow subjects both walk the literal skill to correct cleanup
with concrete paths and no deviations.

skills/finishing-a-development-branch/SKILL.md

@@ -1,71 +1,58 @@
 ---
 name: finishing-a-development-branch
-description: Use when implementation is complete, all tests pass, and you need to decide how to integrate the work - guides completion of development work by presenting structured options for merge, PR, or cleanup
+description: Use when implementation is complete, all tests pass, and you need to decide how to integrate the work
 ---
 
 # Finishing a Development Branch
 
 ## Overview
 
-Guide completion of development work by presenting clear options and handling chosen workflow.
-
 **Core principle:** Verify tests → Detect environment → Present options → Execute choice → Clean up.
 
 **Announce at start:** "I'm using the finishing-a-development-branch skill to complete this work."
 
-## The Process
+## Step 1: Verify Tests
 
-### Step 1: Verify Tests
+Run the project's full test suite (`npm test` / `cargo test` / `pytest` / `go test ./...`).
 
-**Before presenting options, verify tests pass:**
+**If tests fail**, report the failures and stop — the menu comes after a green suite:
 
-```bash
-# Run project's test suite
-npm test / cargo test / pytest / go test ./...
-```
-
-**If tests fail:**
 ```
 Tests failing (<N> failures). Must fix before completing:
 
 [Show failures]
-
-Cannot proceed with merge/PR until tests pass.
 ```
 
-Stop. Don't proceed to Step 2.
+**If tests pass:** continue to Step 2.
 
-**If tests pass:** Continue to Step 2.
-
-### Step 2: Detect Environment
-
-**Determine workspace state before presenting options:**
+## Step 2: Detect Environment
 
 ```bash
 GIT_DIR=$(cd "$(git rev-parse --git-dir)" 2>/dev/null && pwd -P)
 GIT_COMMON=$(cd "$(git rev-parse --git-common-dir)" 2>/dev/null && pwd -P)
+# Capture now, while still inside the workspace — Step 5 changes directory
+# before cleanup (Step 6) needs this value
+WORKTREE_PATH=$(git rev-parse --show-toplevel)
 ```
 
 This determines which menu to show and how cleanup works:
 
 | State | Menu | Cleanup |
 |-------|------|---------|
-| `GIT_DIR == GIT_COMMON` (normal repo) | Standard 4 options | No worktree to clean up |
-| `GIT_DIR != GIT_COMMON`, named branch | Standard 4 options | Provenance-based (see Step 6) |
-| `GIT_DIR != GIT_COMMON`, detached HEAD | Reduced 3 options (no merge) | No cleanup (externally managed) |
+| `GIT_DIR == GIT_COMMON` (normal repo) | Standard 3 options | No worktree to clean up |
+| `GIT_DIR != GIT_COMMON`, named branch | Standard 3 options | Provenance-based (see Step 6) |
+| `GIT_DIR != GIT_COMMON`, detached HEAD | Reduced 2 options (no merge) | Externally managed — leave in place |
 
-### Step 3: Determine Base Branch
+## Step 3: Determine Base Branch
 
-```bash
-# Try common base branches
-git merge-base HEAD main 2>/dev/null || git merge-base HEAD master 2>/dev/null
-```
+The base branch is whatever this work forked from — usually named in the
+plan, the conversation, or the branch's upstream. If it is not already
+known, ask: "This branch split from <your best guess> - is that correct?"
+Confirm before merging: merging into the wrong base is expensive to undo.
 
-Or ask: "This branch split from main - is that correct?"
+## Step 4: Present Options
 
-### Step 4: Present Options
-
-**Normal repo and named-branch worktree — present exactly these 4 options:**
+**Normal repo and named-branch worktree — present exactly these 3 options:**
 
 ```
 Implementation complete. What would you like to do?
@@ -73,28 +60,30 @@ Implementation complete. What would you like to do?
 1. Merge back to <base-branch> locally
 2. Push and create a Pull Request
 3. Keep the branch as-is (I'll handle it later)
-4. Discard this work
 
 Which option?
 ```
 
-**Detached HEAD — present exactly these 3 options:**
+**Detached HEAD — present exactly these 2 options:**
 
 ```
 Implementation complete. You're on a detached HEAD (externally managed workspace).
 
 1. Push as new branch and create a Pull Request
 2. Keep as-is (I'll handle it later)
-3. Discard this work
 
 Which option?
 ```
 
-**Don't add explanation** - keep options concise.
+Present the menu exactly as written — concise, with every option coming
+from the list above. Discarding the work happens only in response to your
+human partner explicitly asking for it (see "If your human partner asks to
+discard the work" below). Wait for their answer; the integration decision
+is theirs.
 
-### Step 5: Execute Choice
+## Step 5: Execute Choice
 
-#### Option 1: Merge Locally
+### Option 1: Merge Locally
 
 ```bash
 # Get main repo root for CWD safety
@@ -108,34 +97,43 @@ git merge <feature-branch>
 
 # Verify tests on merged result
 <test command>
-
-# Only after merge succeeds: cleanup worktree (Step 6), then delete branch
 ```
 
-Then: Cleanup worktree (Step 6), then delete branch:
+If tests fail on the merged result: stop, leave the worktree and branch in
+place, and investigate — nothing has been pushed, so the merge is local
+and recoverable.
+
+Once the merged result is green: clean up the worktree (Step 6), then
+delete the branch:
 
 ```bash
 git branch -d <feature-branch>
 ```
 
-#### Option 2: Push and Create PR
+### Option 2: Push and Create PR
 
 ```bash
-# Push branch
 git push -u origin <feature-branch>
+# From a detached HEAD, name the new branch on the remote:
+# git push origin HEAD:refs/heads/<new-branch>
 ```
 
-**Do NOT clean up worktree** — user needs it alive to iterate on PR feedback.
+Then create the pull/merge request against <base-branch> with the forge's
+tooling — its CLI if one is available, or the creation URL most forges
+print when you push — following the repo's PR template and conventions if
+present, and report the URL to your human partner.
 
-#### Option 3: Keep As-Is
+Keep the worktree — your human partner iterates on PR feedback there.
+
+### Option 3: Keep As-Is
 
 Report: "Keeping branch <name>. Worktree preserved at <path>."
 
-**Don't cleanup worktree.**
+### If your human partner asks to discard the work
 
-#### Option 4: Discard
+This path exists only as a response to an explicit request to throw the
+work away. Confirm first:
 
-**Confirm first:**
 ```
 This will permanently delete:
 - Branch <name>
@@ -145,41 +143,39 @@ This will permanently delete:
 Type 'discard' to confirm.
 ```
 
-Wait for exact confirmation.
+Wait for that exact confirmation. When it arrives:
 
-If confirmed:
 ```bash
 MAIN_ROOT=$(git -C "$(git rev-parse --git-common-dir)/.." rev-parse --show-toplevel)
 cd "$MAIN_ROOT"
 ```
 
-Then: Cleanup worktree (Step 6), then force-delete branch:
+Then clean up the worktree (Step 6) and force-delete the branch:
+
 ```bash
 git branch -D <feature-branch>
 ```
 
-### Step 6: Cleanup Workspace
+## Step 6: Cleanup Workspace
 
-**Only runs for Options 1 and 4.** Options 2 and 3 always preserve the worktree.
-
-```bash
-GIT_DIR=$(cd "$(git rev-parse --git-dir)" 2>/dev/null && pwd -P)
-GIT_COMMON=$(cd "$(git rev-parse --git-common-dir)" 2>/dev/null && pwd -P)
-WORKTREE_PATH=$(git rev-parse --show-toplevel)
-```
+**Runs for Option 1 and confirmed discards.** Options 2 and 3 always
+preserve the worktree. Both callers have already changed directory to the
+main repo root — worktree removal must run from outside the worktree —
+and use the `GIT_DIR`/`GIT_COMMON`/`WORKTREE_PATH` values captured in
+Step 2, from before that directory change.
 
 **If `GIT_DIR == GIT_COMMON`:** Normal repo, no worktree to clean up. Done.
 
-**If worktree path is under `.worktrees/` or `worktrees/`:** Superpowers created this worktree — we own cleanup.
+**If `WORKTREE_PATH` is under `.worktrees/` or `worktrees/`:** Superpowers
+created this worktree — we own cleanup:
 
 ```bash
-MAIN_ROOT=$(git -C "$(git rev-parse --git-common-dir)/.." rev-parse --show-toplevel)
-cd "$MAIN_ROOT"
 git worktree remove "$WORKTREE_PATH"
 git worktree prune  # Self-healing: clean up any stale registrations
 ```
 
-**Otherwise:** The host environment (harness) owns this workspace. Do NOT remove it. If your platform provides a workspace-exit tool, use it. Otherwise, leave the workspace in place.
+**Otherwise:** The host environment owns this workspace — leave it in
+place. If your platform provides a workspace-exit tool, use it.
 
 ## Quick Reference
 
@@ -188,54 +184,18 @@ git worktree prune  # Self-healing: clean up any stale registrations
 | 1. Merge locally | yes | - | - | yes |
 | 2. Create PR | - | yes | yes | - |
 | 3. Keep as-is | - | - | yes | - |
-| 4. Discard | - | - | - | yes (force) |
+| Discard (explicit request only) | - | - | - | yes (force) |
 
-## Common Mistakes
+## Common Rationalizations
 
-**Skipping test verification**
-- **Problem:** Merge broken code, create failing PR
-- **Fix:** Always verify tests before offering options
-
-**Open-ended questions**
-- **Problem:** "What should I do next?" is ambiguous
-- **Fix:** Present exactly 4 structured options (or 3 for detached HEAD)
-
-**Cleaning up worktree for Option 2**
-- **Problem:** Remove worktree user needs for PR iteration
-- **Fix:** Only cleanup for Options 1 and 4
-
-**Deleting branch before removing worktree**
-- **Problem:** `git branch -d` fails because worktree still references the branch
-- **Fix:** Merge first, remove worktree, then delete branch
-
-**Running git worktree remove from inside the worktree**
-- **Problem:** Command fails silently when CWD is inside the worktree being removed
-- **Fix:** Always `cd` to main repo root before `git worktree remove`
-
-**Cleaning up harness-owned worktrees**
-- **Problem:** Removing a worktree the harness created causes phantom state
-- **Fix:** Only clean up worktrees under `.worktrees/` or `worktrees/`
-
-**No confirmation for discard**
-- **Problem:** Accidentally delete work
-- **Fix:** Require typed "discard" confirmation
-
-## Red Flags
-
-**Never:**
-- Proceed with failing tests
-- Merge without verifying tests on result
-- Delete work without confirmation
-- Force-push without explicit request
-- Remove a worktree before confirming merge success
-- Clean up worktrees you didn't create (provenance check)
-- Run `git worktree remove` from inside the worktree
-
-**Always:**
-- Verify tests before offering options
-- Detect environment before presenting menu
-- Present exactly 4 options (or 3 for detached HEAD)
-- Get typed confirmation for Option 4
-- Clean up worktree for Options 1 & 4 only
-- `cd` to main repo root before worktree removal
-- Run `git worktree prune` after removal
+| Excuse | Reality |
+|--------|---------|
+| "Tests passed earlier this session" | Run the suite on the tree you are about to integrate. A green run only proves the tree it ran on. |
+| "They obviously want it merged" | Integration is your human partner's decision. Present the menu and wait. |
+| "They seem done with this feature — I'll offer to discard it" | The menu is complete as written. Discard happens only when your human partner asks for it in so many words. |
+| "'Yeah, get rid of it' counts as confirmation" | Only the typed word `discard` authorizes deletion. |
+| "The PR is up, so the worktree is clutter now" | PR feedback gets fixed in that worktree. It stays until the work lands. |
+| "This other worktree looks stale — I'll clean it too" | Clean up only worktrees under `.worktrees/` or `worktrees/`. Everything else belongs to the host. |
+| "The merged-result failure is probably flaky" | A failing merged result stops everything. Branch and worktree stay put while you investigate. |
+| "The base branch is obviously main" | Confirm the fork point or ask. Merging into the wrong base is expensive to undo. |
+| "The push was rejected — force-push will fix it" | A rejected push means the remote moved. Investigate; force-push only on your human partner's explicit request. |

skills/test-driven-development/SKILL.md

@@ -203,12 +203,6 @@ Next failing test for next feature.
 | **Clear** | Name describes behavior | `test('test1')` |
 | **Shows intent** | Demonstrates desired API | Obscures what code should do |
 
-When writing or changing any test, read [writing-good-tests.md](writing-good-tests.md) for the rules that keep tests honest:
-- Name the production change that would make the test fail — before writing it
-- Assert on real behavior, never on mock behavior
-- Keep test-only code in test utilities, out of production classes
-- Understand a dependency's side effects before mocking it
-
 ## Why Order Matters
 
 **"I'll write tests after to verify it works"**
@@ -360,6 +354,13 @@ Bug found? Write failing test reproducing it. Follow TDD cycle. Test proves fix
 
 Never fix bugs without a test.
 
+## Testing Anti-Patterns
+
+When adding mocks or test utilities, read [testing-anti-patterns.md](testing-anti-patterns.md) to avoid common pitfalls:
+- Testing mock behavior instead of real behavior
+- Adding test-only methods to production classes
+- Mocking without understanding dependencies
+
 ## Final Rule
 
 ```

skills/test-driven-development/testing-anti-patterns.md

@@ -0,0 +1,299 @@
+# Testing Anti-Patterns
+
+**Load this reference when:** writing or changing tests, adding mocks, or tempted to add test-only methods to production code.
+
+## Overview
+
+Tests must verify real behavior, not mock behavior. Mocks are a means to isolate, not the thing being tested.
+
+**Core principle:** Test what the code does, not what the mocks do.
+
+**Following strict TDD prevents these anti-patterns.**
+
+## The Iron Laws
+
+```
+1. NEVER test mock behavior
+2. NEVER add test-only methods to production classes
+3. NEVER mock without understanding dependencies
+```
+
+## Anti-Pattern 1: Testing Mock Behavior
+
+**The violation:**
+```typescript
+// ❌ BAD: Testing that the mock exists
+test('renders sidebar', () => {
+  render(<Page />);
+  expect(screen.getByTestId('sidebar-mock')).toBeInTheDocument();
+});
+```
+
+**Why this is wrong:**
+- You're verifying the mock works, not that the component works
+- Test passes when mock is present, fails when it's not
+- Tells you nothing about real behavior
+
+**your human partner's correction:** "Are we testing the behavior of a mock?"
+
+**The fix:**
+```typescript
+// ✅ GOOD: Test real component or don't mock it
+test('renders sidebar', () => {
+  render(<Page />);  // Don't mock sidebar
+  expect(screen.getByRole('navigation')).toBeInTheDocument();
+});
+
+// OR if sidebar must be mocked for isolation:
+// Don't assert on the mock - test Page's behavior with sidebar present
+```
+
+### Gate Function
+
+```
+BEFORE asserting on any mock element:
+  Ask: "Am I testing real component behavior or just mock existence?"
+
+  IF testing mock existence:
+    STOP - Delete the assertion or unmock the component
+
+  Test real behavior instead
+```
+
+## Anti-Pattern 2: Test-Only Methods in Production
+
+**The violation:**
+```typescript
+// ❌ BAD: destroy() only used in tests
+class Session {
+  async destroy() {  // Looks like production API!
+    await this._workspaceManager?.destroyWorkspace(this.id);
+    // ... cleanup
+  }
+}
+
+// In tests
+afterEach(() => session.destroy());
+```
+
+**Why this is wrong:**
+- Production class polluted with test-only code
+- Dangerous if accidentally called in production
+- Violates YAGNI and separation of concerns
+- Confuses object lifecycle with entity lifecycle
+
+**The fix:**
+```typescript
+// ✅ GOOD: Test utilities handle test cleanup
+// Session has no destroy() - it's stateless in production
+
+// In test-utils/
+export async function cleanupSession(session: Session) {
+  const workspace = session.getWorkspaceInfo();
+  if (workspace) {
+    await workspaceManager.destroyWorkspace(workspace.id);
+  }
+}
+
+// In tests
+afterEach(() => cleanupSession(session));
+```
+
+### Gate Function
+
+```
+BEFORE adding any method to production class:
+  Ask: "Is this only used by tests?"
+
+  IF yes:
+    STOP - Don't add it
+    Put it in test utilities instead
+
+  Ask: "Does this class own this resource's lifecycle?"
+
+  IF no:
+    STOP - Wrong class for this method
+```
+
+## Anti-Pattern 3: Mocking Without Understanding
+
+**The violation:**
+```typescript
+// ❌ BAD: Mock breaks test logic
+test('detects duplicate server', () => {
+  // Mock prevents config write that test depends on!
+  vi.mock('ToolCatalog', () => ({
+    discoverAndCacheTools: vi.fn().mockResolvedValue(undefined)
+  }));
+
+  await addServer(config);
+  await addServer(config);  // Should throw - but won't!
+});
+```
+
+**Why this is wrong:**
+- Mocked method had side effect test depended on (writing config)
+- Over-mocking to "be safe" breaks actual behavior
+- Test passes for wrong reason or fails mysteriously
+
+**The fix:**
+```typescript
+// ✅ GOOD: Mock at correct level
+test('detects duplicate server', () => {
+  // Mock the slow part, preserve behavior test needs
+  vi.mock('MCPServerManager'); // Just mock slow server startup
+
+  await addServer(config);  // Config written
+  await addServer(config);  // Duplicate detected ✓
+});
+```
+
+### Gate Function
+
+```
+BEFORE mocking any method:
+  STOP - Don't mock yet
+
+  1. Ask: "What side effects does the real method have?"
+  2. Ask: "Does this test depend on any of those side effects?"
+  3. Ask: "Do I fully understand what this test needs?"
+
+  IF depends on side effects:
+    Mock at lower level (the actual slow/external operation)
+    OR use test doubles that preserve necessary behavior
+    NOT the high-level method the test depends on
+
+  IF unsure what test depends on:
+    Run test with real implementation FIRST
+    Observe what actually needs to happen
+    THEN add minimal mocking at the right level
+
+  Red flags:
+    - "I'll mock this to be safe"
+    - "This might be slow, better mock it"
+    - Mocking without understanding the dependency chain
+```
+
+## Anti-Pattern 4: Incomplete Mocks
+
+**The violation:**
+```typescript
+// ❌ BAD: Partial mock - only fields you think you need
+const mockResponse = {
+  status: 'success',
+  data: { userId: '123', name: 'Alice' }
+  // Missing: metadata that downstream code uses
+};
+
+// Later: breaks when code accesses response.metadata.requestId
+```
+
+**Why this is wrong:**
+- **Partial mocks hide structural assumptions** - You only mocked fields you know about
+- **Downstream code may depend on fields you didn't include** - Silent failures
+- **Tests pass but integration fails** - Mock incomplete, real API complete
+- **False confidence** - Test proves nothing about real behavior
+
+**The Iron Rule:** Mock the COMPLETE data structure as it exists in reality, not just fields your immediate test uses.
+
+**The fix:**
+```typescript
+// ✅ GOOD: Mirror real API completeness
+const mockResponse = {
+  status: 'success',
+  data: { userId: '123', name: 'Alice' },
+  metadata: { requestId: 'req-789', timestamp: 1234567890 }
+  // All fields real API returns
+};
+```
+
+### Gate Function
+
+```
+BEFORE creating mock responses:
+  Check: "What fields does the real API response contain?"
+
+  Actions:
+    1. Examine actual API response from docs/examples
+    2. Include ALL fields system might consume downstream
+    3. Verify mock matches real response schema completely
+
+  Critical:
+    If you're creating a mock, you must understand the ENTIRE structure
+    Partial mocks fail silently when code depends on omitted fields
+
+  If uncertain: Include all documented fields
+```
+
+## Anti-Pattern 5: Integration Tests as Afterthought
+
+**The violation:**
+```
+✅ Implementation complete
+❌ No tests written
+"Ready for testing"
+```
+
+**Why this is wrong:**
+- Testing is part of implementation, not optional follow-up
+- TDD would have caught this
+- Can't claim complete without tests
+
+**The fix:**
+```
+TDD cycle:
+1. Write failing test
+2. Implement to pass
+3. Refactor
+4. THEN claim complete
+```
+
+## When Mocks Become Too Complex
+
+**Warning signs:**
+- Mock setup longer than test logic
+- Mocking everything to make test pass
+- Mocks missing methods real components have
+- Test breaks when mock changes
+
+**your human partner's question:** "Do we need to be using a mock here?"
+
+**Consider:** Integration tests with real components often simpler than complex mocks
+
+## TDD Prevents These Anti-Patterns
+
+**Why TDD helps:**
+1. **Write test first** → Forces you to think about what you're actually testing
+2. **Watch it fail** → Confirms test tests real behavior, not mocks
+3. **Minimal implementation** → No test-only methods creep in
+4. **Real dependencies** → You see what the test actually needs before mocking
+
+**If you're testing mock behavior, you violated TDD** - you added mocks without watching test fail against real code first.
+
+## Quick Reference
+
+| Anti-Pattern | Fix |
+|--------------|-----|
+| Assert on mock elements | Test real component or unmock it |
+| Test-only methods in production | Move to test utilities |
+| Mock without understanding | Understand dependencies first, mock minimally |
+| Incomplete mocks | Mirror real API completely |
+| Tests as afterthought | TDD - tests first |
+| Over-complex mocks | Consider integration tests |
+
+## Red Flags
+
+- Assertion checks for `*-mock` test IDs
+- Methods only called in test files
+- Mock setup is >50% of test
+- Test fails when you remove mock
+- Can't explain why mock is needed
+- Mocking "just to be safe"
+
+## The Bottom Line
+
+**Mocks are tools to isolate, not things to test.**
+
+If TDD reveals you're testing mock behavior, you've gone wrong.
+
+Fix: Test real behavior or question why you're mocking at all.

skills/test-driven-development/writing-good-tests.md

@@ -1,198 +0,0 @@
-# Writing Good Tests
-
-**Load this reference when:** writing or changing tests, adding mocks, or
-adding cleanup/helper methods for tests.
-
-## Overview
-
-A test exists to catch a specific break. Two principles govern everything
-here:
-
-```
-1. Every test names the break it catches
-2. Every test exercises the real thing
-```
-
-Strict TDD produces both naturally: a test written first and watched
-failing against real code has already proven it can fail, and only earns
-a mock when the real dependency proves slow or external.
-
-## Principle 1: Name the Break
-
-Before writing the test body, answer: **what production change should
-make this test fail — and is that change a bug or a decision?** A test
-earns its place by catching a wrong branch, missing side effect, wrong
-argument, boundary case, or broken contract.
-
-**Derive expectations independently.** Use literals and hand-checked
-fixtures; table-driven tests with literal `want` values are the preferred
-shape. An expectation computed by the code under test — or its helpers —
-passes no matter what that code does:
-
-```typescript
-// ❌ Mirror assertion: the same builder computes both sides — always true
-const expected = buildSearchQuery({ tag: 'urgent' });
-expect(buildSearchQuery({ tag: 'urgent' })).toBe(expected);
-
-// ✅ Hand-derived literal
-expect(buildSearchQuery({ tag: 'urgent' })).toBe('tag:"urgent"');
-```
-
-**No change detectors.** If only intentional decisions can fail a test —
-a constant's value, exact message wording, private structure — it fires
-on redesign and sleeps through bugs. Test the behavior that depends on
-the decision: not `expect(MAX_RETRIES).toBe(5)` but "a failing call is
-retried 5 times and the 6th attempt never happens."
-
-**Behavior, not text.** Asserting that a script, skill, or config
-contains an exact line proves only that the source is the source. Run
-scripts against controlled inputs and assert outputs, side effects, or
-exit codes. Documents that instruct agents are tested by the consuming
-agent's behavior (superpowers:writing-skills); prose for humans earns no
-test at all.
-
-**Your code, not the framework.** Test the contract your code makes at
-its boundaries — the route you register, the query you emit, the payload
-you produce. Upstream mechanics are their maintainers' tests to write
-(the classic: asserting your router invokes a registered handler — that
-is the framework's test, not yours). When upstream behavior genuinely
-surprised you, write one narrow characterization test naming the
-assumption. The same boundary applies inside your code: constructors,
-getters, constants, and trivial forwarding earn tests only when they
-validate, normalize, default, derive, enforce, or cause side effects —
-otherwise assert the first consumer-visible result that depends on them.
-
-### Gate Function
-
-```
-BEFORE writing the test body:
-  Name the production change that would make this test fail.
-
-  Cannot name one            → redesign around an observable behavior
-  "The source text changed"  → run the artifact and assert its effects
-  Only intentional decisions → change detector; test the behavior
-                               that depends on the decision
-
-  Confirm the expected value is derived without the code under test.
-  IF it reuses the code's logic or helpers:
-    Replace it with a literal or hand-checked fixture
-```
-
-## Principle 2: Exercise the Real Thing
-
-**The mock earns no assertions.** A mock assertion passes when the mock
-is present and fails when it is absent — it says nothing about the
-component. Assert the real component's behavior; if the mock is what you
-are checking, unmock it or delete the assertion.
-
-```typescript
-// ✅ Real behavior
-expect(screen.getByRole('navigation')).toBeInTheDocument();
-
-// ❌ Mock existence
-expect(screen.getByTestId('sidebar-mock')).toBeInTheDocument();
-```
-
-**your human partner's correction:** "Are we testing the behavior of a
-mock?"
-
-**Mock at the right level.** Learn every side effect of the real method
-before replacing it; mock the slow or external operation and keep what
-the test depends on real. When unsure, run the test against the real
-implementation first and observe what actually needs to happen.
-
-```typescript
-// ❌ The mock swallows the config write that duplicate detection reads
-vi.mock('ToolCatalog', () => ({
-  discoverAndCacheTools: vi.fn().mockResolvedValue(undefined)
-}));
-
-// ✅ Mock only the slow server startup; the config write stays real
-vi.mock('MCPServerManager');
-```
-
-**Make doubles specific.** When arguments, call counts, or ordering are
-part of the contract, assert them — a fake that accepts anything verifies
-nothing. Give each branch (success, error, malformed) its own fixture or
-spy, so the wrong branch cannot satisfy the expectation.
-
-**Mirror real data completely.** Mock the complete structure as it exists
-in reality — all documented fields — not just the ones your test reads.
-Partial mocks fail silently when downstream code reads an omitted field:
-the test passes while integration breaks.
-
-**Production classes carry production methods only.** Cleanup that only
-tests need lives in test utilities, never as a `destroy()` on the
-production class. Ask: is this method called only from tests? Does this
-class own this resource's lifecycle? Wrong answers → test utility.
-
-**Prefer real components over complex mocks.** When mock setup outgrows
-the test logic, mocks miss methods the real components have, or tests
-break when the mock changes, switch to an integration test with real
-components. **your human partner's question:** "Do we need to be using a
-mock here?"
-
-### Gate Function
-
-```
-BEFORE adding a mock or test helper:
-  List the real method's side effects; keep the ones the test
-  depends on real — mock the slow/external level below them.
-
-  Mock responses mirror the complete real structure.
-
-  A method only tests call lives in test utilities, not production.
-
-  About to assert on the mock itself?
-    Unmock it or delete the assertion.
-```
-
-## Tests Ship With the Implementation
-
-The TDD cycle — failing test, minimal implementation, refactor — is what
-"complete" means. Ship the tests the behavior needs and only those:
-trivial code and human prose earn none, and a test written to satisfy
-process costs maintenance forever.
-
-## The Mutation Check
-
-Before finishing, mentally mutate the production code; at least one test
-should fail for each realistic mutation:
-
-- Wrong constant or argument
-- Wrong branch handler
-- Missing state change or side effect
-- Empty or default return
-- Missing validation for zero, empty, nil, unauthorized, or malformed input
-
-A mutation nothing catches marks the behavior as unprotected — or the
-test as tautological.
-
-## Quick Reference
-
-| When you... | Do |
-|-------------|-----|
-| Write any test | Name the break it catches — a bug, not a decision |
-| Build an expected value | Derive it by hand; never with the code under test |
-| Test a script or document | Run it / pressure-test its consumer; never grep its text |
-| Reach for a dependency test | Test your boundary contract, not their documented mechanics |
-| Want to assert on a mocked element | Test the real component, or unmock it |
-| Are about to mock a method | Learn its side effects; mock the slow/external level |
-| Build a mock response | Mirror the real structure completely |
-| Need cleanup only tests use | Put it in test utilities |
-| Watch mock setup balloon | Switch to an integration test with real components |
-| Finish a test file | Run the mutation check |
-
-## Warning Signs
-
-- Setup and assertion share the same object, guaranteeing equality
-- The test can fail only through a panic, crash, or missing selector
-- The test fails on every intentional change, never on accidental breakage
-- Expected values are hidden behind loops, builders, or helpers
-- The test greps source text, or asserts a removed symbol stays removed
-- The test would still matter if only the framework remained
-- The test exists for coverage, checking no side effect or outcome
-- An assertion checks a `*-mock` test ID, or fails if you remove the mock
-- A method is called only from test files
-- Mock setup is more than half the test, or you can't explain why the mock is needed
-- Mocking "just to be safe"