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Encode the complete software development lifecycle into repeatable,
quality-gated workflows that agents execute with the discipline of a
senior production engineering team. This skill transforms any AI agent
into a structured delivery partner — from the first spec to the final
deploy, every phase is gated, verified, and auditable.
Quality Gate Rule: No phase proceeds to the next until its gate
passes. A failed gate means stop and fix — never skip.
When to Use This Skill
Activate this skill when the user asks you to:
"Build a new feature" / "Implement X from scratch" / "Start a new project"
"Plan the work for this spec" / "Break this down into tasks"
"Deploy to production" / "Ship this change" / "Push to prod"
"Run the performance audit" / "Check Core Web Vitals"
"Simplify this code" / "Clean up this module" / "Refactor without breaking"
"Walk me through the SDLC" / "What's the right way to ship this?"
"Set up CI/CD for this project" / "Automate the deploy pipeline"
"How do I make this production-ready?"
Additionally, activate proactively when:
A conversation spans multiple phases of development and needs structured
workflow management.
The user is about to merge or deploy and hasn't followed a review/test
workflow.
Code quality or performance issues are surfacing repeatedly — suggest
the relevant command as a gate.
Do NOT Activate For
The following inputs are near-miss negatives — they sound like
workflow requests but are not production engineering concerns:
Trivial one-liner changes: "Change this string constant" — not a
workflow, just a direct edit. No need for spec/plan/deploy cycle.
Purely conversational tech discussion: "What's the best way to
structure a React app?" — opinion/advice, not a build task.
Code explanation: "What does this regex do?" — teaching, not building.
Documentation-only work: "Write a README for this module" — no
production change to ship.
Debugging a single bug with known fix: "This function returns the
wrong sign, swap the > for <" — trivial fix, not a workflow.
Data exploration: "Query the DB and tell me how many users signed
up today" — analysis, not engineering.
Third-party service configuration: "Set up a new GitHub repo" —
admin task, not a production code change.
Experimental spike/prototype: "Let me try a few ideas and see what
works" — exploration, not delivery. (Use /spec only after the spike
when committing to build.)
If uncertain, ask: "This looks like it could use a structured workflow.
Would you like me to start with /spec, or is this more of an ad-hoc
change?"
Workflow Commands
Each command is a self-contained phase. They can be used independently
or as a complete pipeline. When chaining, respect gate rules — never
skip a phase whose gate is red.
/spec — Define What to Build
Principle: Spec before code. Write the specification before writing
any implementation. The spec is the source of truth for everything that
follows.
Input Sources
User's natural language description of the feature or change.
Existing project documentation, README, or architecture docs.
## Feature Specification: <Title>
### Problem Statement
<1-2 sentences: What problem does this solve? For whom?>
### Proposed Solution
<High-level approach. Technology choices. Architectural decisions.>
### Functional Requirements
1. <Requirement — testable, unambiguous>
2. <Requirement>
...
### Acceptance Criteria (BDD Format)
- **Given** <precondition>
- **When** <action>
- **Then** <expected outcome>
### Non-Goals (Explicit Scope Boundaries)
- We are NOT doing X
- We are NOT changing Y
### Dependencies
- Requires: <library/service/team>
- Blocks: <nothing / ticket #Z>
### Success Metrics
- <Measurable outcome — e.g., "API response p95 < 200ms">
### Risks & Mitigations
| Risk | Impact | Mitigation |
|------|--------|------------|
| ... | ... | ... |
### Timeline Estimate
- <Rough sizing: S/M/L/XL. Not a commitment, a planning input.>
Spec Review Gates
Before /plan can begin, the spec must pass these gates:
Completeness: Every functional requirement is testable.
Clarity: A new team member could read it and understand the goal.
Bounded scope: Non-goals are explicit. No scope creep on day one.
Dependency check: All dependencies are known and available.
Risk awareness: At least one risk is identified and mitigated.
Stakeholder alignment: If the user is not the sole stakeholder,
ask: "Has this been reviewed by ?"
Anti-Patterns
Writing a novel: The spec should be 1-3 pages, not 50. It's a
blueprint, not the building.
Premature implementation details: "Use a hash map with quadratic
probing" belongs in /plan or /build, not /spec.
No non-goals: A spec without non-goals is an invitation to scope
creep. Always define what you won't do.
Vague acceptance criteria: "It should work well" is not testable.
Use BDD format.
/plan — Plan How to Build It
Principle: Small, atomic tasks. Decompose the spec into the smallest
verifiable units of work. Each task must be independently buildable,
testable, and committable.
Task Decomposition Rules
Atomic: One task = one clear change. If you can't describe it in
one sentence, split it.
Verifiable: Every task has a concrete acceptance test. "Task done"
means the test passes.
Ordered: Tasks list dependencies explicitly. No circular deps.
Small: A task should take 15-60 minutes. If it takes longer,
split further.
Committable: Each task produces a clean, green commit.
Task Template
### Task N: <Short Title>
- **Depends on**: Task N-1, Task N-3 (or "None")
- **Files affected**: src/foo.ts, tests/foo.test.ts
- **Description**: <What to build. 1-2 sentences.>
- **Acceptance**: <BDD format — Given/When/Then>
- **Estimated effort**: <S:15min / M:30min / L:60min>
- **Risk level**: <Low / Medium / High>
- **Rollback plan**: <How to undo if it goes wrong>
Example Task Breakdown
Spec: User email verification on signup
Task 1: Add `email_verified` column to users table
- Files: migrations/004_email_verified.sql
- Acceptance: Column exists, default=false, not null
- Effort: S | Risk: Low | Rollback: Down migration
Task 2: Generate verification token on user create
- Depends on: Task 1
- Files: src/services/user_service.ts
- Acceptance: Token is crypto-random, stored with user, expires in 24h
- Effort: M | Risk: Low | Rollback: Revert commit
Task 3: Send verification email
- Depends on: Task 2
- Files: src/services/email_service.ts, src/templates/verify.html
- Acceptance: Email sent with valid link containing token
- Effort: M | Risk: Medium | Rollback: Disable email send in config
Task 4: Verify endpoint — mark user as verified
- Depends on: Task 2
- Files: src/routes/verify.ts
- Acceptance: GET /verify?token=X marks user verified, redirects
- Effort: M | Risk: Low | Rollback: Revert route
Task 5: Gate login on email_verified
- Depends on: Task 4
- Files: src/services/auth_service.ts
- Acceptance: Unverified users get 403 with "verify email" message
- Effort: S | Risk: Medium | Rollback: Feature flag off
Plan Review Gates
All tasks are atomic and independently verifiable.
No task exceeds 60-minute estimate.
Dependency ordering is correct and acyclic.
Every task has acceptance criteria in BDD format.
High-risk tasks have explicit rollback plans.
The plan covers all functional requirements from the spec.
Anti-Patterns
The monolith task: "Implement user email verification" as one
task. This hides complexity and makes rollback impossible.
Tasks without acceptance criteria: "Refactor the service layer" —
how do you know when you're done?
Ignoring dependencies: Building the verification endpoint before
the token generation exists.
Gold-plating: Adding "also improve the logging framework" to a
feature plan. Separate concerns.
/build — Build Incrementally (Test-Driven)
Principle: One slice at a time, test-first. Implement each planned
task using the Red-Green-Refactor cycle. Every task produces its own
clean, green commit.
Build Cycle Per Task
TEST FIRST → WATCH IT FAIL → IMPLEMENT → WATCH IT PASS → REFACTOR → COMMIT
│ │ │ │ │ │
▼ ▼ ▼ ▼ ▼ ▼
Write the Confirm the Write the Confirm Clean up Atomic
test case test fails minimal tests the code commit
first (red) code to pass (green) without with
pass it changing message
behavior
Commit Convention
Every task commit follows this format:
<type>(<scope>): <short description>
<optional body — what and why>
Task: <task number> / <total tasks>
Acceptance: <BDD>
Test first. Always. No implementation code without a failing test
first. The only exception is pure config/boilerplate.
Minimal implementation. Write only the code needed to make the
test pass. No "I might need this later."
One commit per task. If you need two commits, split the task.
Green before moving on. Never start Task N+1 if Task N's tests
are red.
Commit on green, not on red. Never commit failing tests to main.
Feature branches can hold red tests temporarily.
Small commits. Each commit should be reviewable in under 5
minutes.
Build Gates (Per Task)
Tests written first and observed failing (red).
Implementation written (minimal, correct).
All tests passing (green) — not just the new ones, the full suite.
Any dead code or debug logging removed.
Commit message follows convention.
No unrelated changes crept in ("while I'm here...").
Common Build Pitfalls
Skipping the red phase: If you write the test and it passes
immediately, either the test is wrong or the code already does it.
Investigate before proceeding.
Implementing more than the test requires: Over-engineering at the
task level. Build exactly what the test demands, then iterate.
Mixing concerns: A "feat" commit that also refactors unrelated
code. Separate PRs for separate concerns.
Large commits: A commit touching 15 files is not a task, it's a
feature. Split it.
/test — Prove It Works
Principle: Tests are proof, not decoration. Every piece of behavior
has a test that proves it works. Tests are the living specification of
the system.
Test Pyramid
╱ E2E ╲ ~5% — Critical user journeys
╱─────────╲
╱Integration ╲ ~15% — Service boundaries, DB, APIs
╱───────────────╲
╱ Unit Tests ╲ ~80% — Logic, edge cases, pure functions
╱───────────────────╲
Test Types & When to Use
Type
Scope
Speed
When
Unit
Single function/module
<10ms
Logic, calculations, validation, transformation
Integration
Service + DB/API/Cache
<500ms
Repository layer, API handlers, middleware
E2E
Full user journey
1-30s
Signup flow, checkout, critical paths
Snapshot
UI component output
<100ms
Component rendering (review changes carefully)
Property-based
Invariants over random inputs
varies
Data structures, parsers, serializers
Performance
Throughput/latency thresholds
seconds
Hot paths, endpoints, expensive queries
Test Quality Standards
Good tests are DAMP (Descriptive And Meaningful Phrases) — not DRY
(Don't Repeat Yourself). Readability beats cleverness in tests.
// ❌ DRY test — hides intent behind abstractions
const user = createTestUser();
const result = service.processUser(user, { flag: true });
assertResult(result, { status: 'active', processed: true });
// ✅ DAMP test — the story is explicit
it('activates a verified user when the feature flag is on', () => {
const verifiedUser = new User({ verified: true, status: 'pending' });
const result = activationService.process(verifiedUser, { newFlow: true });
expect(result.status).toBe('active');
expect(result.processed).toBe(true);
expect(result.activatedAt).toBeInstanceOf(Date);
});
The Beyoncé Rule: If you liked it then you should have put a test
on it. Every code change must either:
Have a test, OR
Be a refactoring that changes no behavior (and existing tests pass), OR
Be explicitly excluded (config, docs, formatting).
Test Gates
Test pyramid ratios are approximately correct (80/15/5).
All unit tests pass (<10s total).
All integration tests pass (<60s total).
All E2E tests pass (critical paths only).
New code has corresponding tests (Beyoncé Rule).
No flaky tests — if a test fails intermittently, fix or remove it.
Test coverage on changed lines is ≥80% (if measurable).
Edge cases are tested: null, empty, boundary values, errors.
Anti-Patterns
Testing the framework, not your code: expect(1+1).toBe(2) tests
JavaScript arithmetic, not your business logic.
Tests without assertions: A test that runs code but never checks
anything is worse than no test — it creates false confidence.
Mocking everything: If every dependency is mocked, you're testing
a hollow shell. Balance mocks with integration tests.
Flaky tests in CI: A test that passes "most of the time" erodes
trust in the whole suite. Fix or quarantine.
Testing implementation details: "It calls the validateEmail
helper" — test the outcome, not the internal plumbing.
/review — Review Before Merge
Principle: Improve code health systematically. Every change is
reviewed across five axes: security, correctness, quality, architecture,
and performance. No change merges with blocker or major findings.
Must fix before merge. Security, data loss, crash, broken core.
🟠 MAJOR
Should fix before merge. Bug, significant perf, pattern violation.
🟡 MINOR
Nice to fix. Code smell, minor duplication, unclear naming.
⚪ NIT
Optional. Style preference, formatting, personal taste.
Decision rule:
Any BLOCKER or MAJOR → ❌ Do not merge.
Only MINOR and NIT → ⚠️ Approve with suggestions.
No findings → ✅ Approved.
Review Gates
Five-axis review completed for all changed files.
All BLOCKER findings addressed with concrete fixes.
All MAJOR findings either fixed or explicitly deferred with a ticket.
No secrets echoed in the review output.
Change is appropriately sized (ideally ≤400 lines; >400 requires justification).
Test coverage on changed code is adequate.
Review output includes an explicit merge recommendation.
Review Anti-Patterns
Rubber-stamping: "LGTM" without reading the diff. Never.
Reviewing code you haven't fully read: Read the entire diff.
Context from line 120 might explain line 15.
Nit-picking without substance: Don't drown the author in
formatting nits when there are real bugs.
Scope creep: Review the diff, not the codebase. Flag related
concerns as separate issues.
Harsh language: "This is broken" → "This could return null,
causing a TypeError on line 45."
/webperf — Audit Web Performance
Principle: Measure before you optimize. Run a structured performance
audit using Lighthouse, Core Web Vitals, and runtime profiling. Every
finding comes with a measurement, not a guess.
Audit Dimensions
Dimension
Tool
Budget/Threshold
LCP (Largest Contentful Paint)
Lighthouse / CrUX
<2.5s (good), <4.0s (needs work)
INP (Interaction to Next Paint)
Lighthouse / CrUX
<200ms (good), <500ms (needs work)
CLS (Cumulative Layout Shift)
Lighthouse / CrUX
<0.1 (good), <0.25 (needs work)
TTFB (Time to First Byte)
WebPageTest
<800ms
JS Bundle Size
webpack-bundle-analyzer
<200KB gzipped per route
Image Waste
Lighthouse image audit
All images appropriately sized
Render-Blocking
Lighthouse
Critical CSS inlined, non-critical deferred
Runtime Performance
Chrome DevTools Profiler
No long tasks >50ms on main thread
Audit Workflow
Measure: Run Lighthouse on the changed pages (mobile + desktop).
Profile: Use browser DevTools to record runtime performance.
Analyze Bundle: If JS/CSS changed, analyze bundle size change.
Compare: Show before/after for each metric if baseline exists.
Recommend: For every metric below threshold, provide a concrete
fix with estimated impact.
Performance Gates
LCP < 2.5s on mobile (or no regression from baseline).
CLS < 0.1 on mobile.
INP < 200ms on mobile.
No long tasks (>50ms) introduced.
Bundle size did not increase by >10% without justification.
All images are correctly sized and use modern formats (WebP/AVIF).
No render-blocking resources blocking FCP.
Anti-Patterns
Optimizing without measuring: "This loop looks slow, let me cache
it." Measure first. You might be fixing the wrong thing.
Micro-optimizations at the expense of readability: Saving 2ms on
a non-interactive page by making the code unreadable.
Ignoring mobile: Desktop-only performance testing misses the
majority of users. Always measure mobile first.
Adding libraries for minor gains: A 50KB library to save 1KB of
custom code is a net loss.
/code-simplify — Simplify Without Breaking
Principle: Clarity over cleverness. Reduce complexity while
preserving exact behavior. Every simplification is verified by tests,
not assumptions.
Chesterton's Fence
Before removing or simplifying anything, understand why it exists.
Chesterton's Fence: "Don't remove a fence until you know why it was put
up." If the reason is not obvious, investigate before removing.
Simplification Targets
Pattern
Simplification
Deep nesting (>4 levels)
Early returns, guard clauses, extract functions
Long functions (>50 lines)
Extract cohesive sub-functions
Complex conditionals
Replace with lookup tables, strategy pattern, or boolean decomposition
Duplicated logic
Extract shared function (only if truly identical)
Over-abstracted code
Inline unnecessary indirection
Dead code/commented-out code
Remove (git history preserves it)
Magic numbers/strings
Replace with named constants
Overly clever one-liners
Expand to readable multi-line with intent comments
Simplification Workflow
Identify: Find the complexity hotspot (long function, deep
nesting, duplicated logic).
Verify behavior: Ensure existing tests cover the code being
simplified. If not, add characterization tests first.
Simplify in small steps: One refactoring move at a time. Each
step is committable and verified by tests.
Run full test suite after each step: Never batch refactorings.
If tests break, you know exactly which step caused it.
Compare before/after: Show the complexity reduction (lines,
cyclomatic complexity, nesting depth).
Simplification Gates
Behavior is identical (all tests pass, no new failures).
Code is measurably simpler (fewer lines, lower complexity, shallower nesting).
No new abstractions introduced unless they genuinely reduce complexity.
Chesterton's Fence satisfied — removed code was understood and justified.
No performance regression (run perf tests if applicable).
Commit message explains why the simplification improves the code.
Anti-Patterns
Refactoring without test coverage: You're not simplifying, you're
rewriting with a blindfold.
Big-bang refactoring: "Let me just restructure the entire module
in one go." Incremental or nothing.
Adding abstraction instead of removing it: Simplifying doesn't
mean "wrap it in another layer." Often it means the opposite.
Changing behavior during simplification: The only acceptable
behavior change is fixing a bug found during simplification — and
that gets its own commit.
/ship — Deploy to Production
Principle: Faster is safer. Deploy frequently in small batches.
Every deployment is behind a feature flag, with monitoring, a rollback
plan, and a defined blast radius.
Pre-Deployment Checklist
All tests pass on the CI pipeline — unit, integration, E2E.
Code review complete with no BLOCKER findings.
Performance audit shows no regressions.
Database migrations tested against production-sized dataset
(or staging replica).
New feature is behind a feature flag (if any risk).
Monitoring dashboards/alerting configured for new behavior.
Runbook updated with new error patterns and mitigation steps.
Rollback plan documented and tested in staging.
Deployment window communicated (if applicable).
On-call engineer notified (if applicable).
Deployment Strategy Selection
Strategy
When to Use
Risk Level
Direct deploy
Trivial config/typo fixes, zero-risk changes
None
Feature flag
New features, behavioral changes, refactors
Low-Medium
Canary deploy
Performance-sensitive changes, new infrastructure
Medium
Blue-green
Database migrations, breaking schema changes
Medium-High
Percentage rollout
ML model updates, algorithm changes
Medium-High
Dark launch
New services, major architecture changes
High
Canary Deployment Workflow
Deploy to canary (1-5% of traffic).
Monitor for N minutes (error rate, latency, saturation — USE method).
If healthy: Increase to 25%, monitor again.
If healthy: Increase to 100%.
If unhealthy at any stage: Roll back canary. Do not wait.
Time to rollback should be measured in seconds, not minutes.
Monitoring Gates (Post-Deploy)
Error rate within normal bounds (±2 standard deviations).
P95/P99 latency within normal bounds.
No new alerts triggered.
Business metrics unaffected (conversion rate, signups, payments).
Feature flag validation: new feature works for enabled users,
nothing changes for disabled users.
Rollback Plan Template
### Rollback Plan: <Change>
**Trigger**: Error rate >X%, latency p95 >Yms, or <specific alert name>
fires for >Z minutes.
**Action**: Revert commit <sha> or deploy previous version <tag>.
**Recovery time**: <N> minutes (automated / manual).
**Data rollback**: <Migration is reversible / no data change / manual
script at scripts/rollback_xxx.sh>.
**Communication**: Notify #incidents channel. Update status page.
Anti-Patterns
Friday afternoon deployments: The "read-only Friday" rule exists
for a reason. Changes that break won't be noticed until Monday.
Deploying without a rollback plan: If you can't roll back in
under 5 minutes, you shouldn't deploy.
Big-bang releases: Deploying 2 weeks of work in one push.
Deploy daily, even if features are hidden.
No feature flags: Coupling deployment from release is table stakes
for production engineering.
Assuming staging == production: Data volume, traffic patterns,
edge cases — they differ. Monitor production specifically.
Alert fatigue: Alerts that fire constantly and are ignored are
worse than no alerts. They create noise that hides real issues.
Integrated Pipeline: End-to-End
When the user wants to go from idea to production in one flow, chain
the commands:
/spec → Spec review gates ALL pass → proceed to /plan
/plan → Plan review gates ALL pass → proceed to /build
/build → Each task: red→green→commit → proceed to /test
/test → All suites green → proceed to /review
/review → No BLOCKERS, no MAJORS → proceed to /webperf
/webperf → Budgets met → proceed to /code-simplify
/code-simplify → No regressions → proceed to /ship
/ship → Canary healthy → Deployment complete
If any gate fails, the pipeline stops. The agent reports the failure
clearly: "Pipeline halted at /review — BLOCKER: SQL injection risk
in src/search.ts:42. Fix and re-run /review before proceeding."
Common Pitfalls Across All Phases
System-Level Anti-Patterns
Skipping gates "because it's urgent": Urgency amplifies the
cost of failure. The gates exist precisely to prevent the disasters
that happen when we rush.
Mixing phases: Writing code during /spec, reviewing during
/build, deploying before /test. Each phase has a purpose.
Respect the boundaries.
Vague exit criteria: "It looks good" is not a gate. Every gate
has explicit, binary criteria. Pass or fail — no maybe.
Trusting the agent blindly: The agent is a tool, not an
authority. Review its output. Question its decisions. The agent
follows the process; you're responsible for the outcome.
Ignoring near-miss negatives: Activating the full SDLC pipeline
for a one-line config change is overhead, not engineering. Match
the workflow to the risk.
Feature flag abuse: Feature flags that live for 6 months become
technical debt. Every flag should have an owner and an expiry date.
Alert fatigue: Every alert should demand action. If an alert
fires and the response is "yeah, it does that sometimes," remove or
tune it.
One-size-fits-all deployment: A typo fix doesn't need canary
deployment. A database migration does. Calibrate the strategy to
the risk.
Safety Rules
ABSOLUTE RULES — never violate these:
Never skip a gate without explicit user approval. If the user
says "just deploy it, skip the review," say: "I can deploy without
review, but this bypasses the safety gates. The change includes
modified files and . Are you sure?" Document
the override.
Never deploy without a verified rollback plan. Even if it's
"revert the commit." The rollback must be tested or trivially
executable.
Never commit secrets. Before every commit, scan for API keys,
tokens, passwords, private keys. Use automated scanning where
available.
Never destroy data without a backup. Schema changes, data
migrations, bulk deletes — verify a recent backup exists before
executing.
Never deploy on unverified CI. If the CI pipeline is red for
any reason other than a known, documented flaky test, halt the
pipeline.
Never override production safety mechanisms without
justification. Read-only mode, rate limits, circuit breakers,
auth gates — these exist for a reason.
Be transparent about uncertainty. If the agent is unsure about
deployment risk, context switching, or rollback safety, state it
explicitly. "I have medium confidence in this deployment. The risk
areas are . Human judgment needed."
Respect team conventions. If the team uses a different branch
naming, commit format, or deploy workflow, adapt. Don't impose the
skill's defaults over established team practice.
Verification Checklist
Before finalizing any workflow execution, confirm:
The correct command was activated for the task scope.
All gates for the current phase have been checked.
No gate was skipped without explicit user override.
Output includes explicit pass/fail for each gate.
If a gate failed, the output includes actionable next steps.
The user was informed of any risks or uncertainties.
Commit messages follow the project's conventions.
No secrets, PII, or sensitive data in output.
Feature flags are documented with owner and expiry.
The rollback plan is current and tested.
Platform Compatibility Notes
This skill is designed to work across AI coding platforms. Adaptations:
Good at structured task decomposition. For git operations, the user may need to run commands manually. Provide the commands to run.
Cursor
Can read/write workspace files directly. Use IDE context for file references. Slash commands work as custom rules.
Gemini CLI
Large context window excels at spec generation. Use native skill installation. Git via shell commands.
OpenClaw
Access to GitHub and Git skills. Use exec for CLI operations. Slash commands as skill triggers.
GitHub Copilot
Works within IDE context. Can access workspace files. Use .github/copilot-instructions.md for workflow rules.
Windsurf
Native workspace file access. Add skill as Windsurf rules. Git commands via terminal.
OpenCode
Terminal-based with git/shell access. AGENTS.md integration. Skill tool for workflow activation.
Platform-Specific Adjustments
If shell commands are unavailable: Provide the exact commands for
the user to run manually, with clear expected outputs.
If CI/CD integration is limited: Document the pipeline steps and
let the user configure CI manually.
If performance audit tools are unavailable: Focus on static
analysis — bundle size estimation, complexity analysis, image size
checks — and provide recommendations for manual verification.
If feature flags are not configured: Recommend a simple env-var
toggle pattern as fallback. Document the migration path to a proper
feature flag system.
For Discord/Slack delivery: Use bullet lists, not tables. Wrap
links in <>. Split long outputs across messages.
References
references/sdlc-patterns.md — SDLC best practices and anti-patterns
scripts/validate_skill.py — Validation script for SKILL.md compliance
evals/test_cases.json — Evaluation cases with near-miss negatives
