CI Fix Skill

Diagnose and fix GitHub Actions CI failures using patterns from past CI issues.

Quick Diagnosis Pattern

1. Get CI status:

gh run list --limit 5 --json status,conclusion,name,headBranch

1. Get failed job logs:

gh run view <run_id> --log --job <job_name>

1. Categorize failure:

• lint: fmt/clippy warnings
• test: test failures or timeouts
• build: compilation errors
• security: cargo audit/deny failures
• coverage: coverage threshold missed
• deprecated: old action versions (common!)

Common Fixes (From History)

Deprecated GitHub Actions

# Detect
grep -r "actions/checkout@v1" .github/workflows/
grep -r "actions-rs" .github/workflows/

# Fix: Update to v2+

Optional Dependency Issues (libclang, wasmtime)

# Pattern: --all-features triggered optional dep issues
# Fix: Use workspace exclude
cargo build --workspace --exclude do-memory-mcp

Clippy Lint Allow-List

# See new warnings
./scripts/code-quality.sh clippy --workspace 2>&1 | grep "warning:"

# Fix: Add #[allow(...)] comments

Coverage Threshold

# Generate coverage
cargo tarpaulin --workspace

# Check threshold in .github/workflows/

Benchmark Timeout

# Increase timeout-minutes in workflow YAML

Check Quick Check Status CANCELLED after 15m

# Symptom: YAML Lint (or CI) "Check Quick Check Status" cancelled; real jobs skipped
# Cause: wait-on-check timeout-minutes:15 < Quick Check wall time (~15–20m)
# Permanent fix:
#  1. Remove wait gate from cheap workflows (yaml-lint.yml)
#  2. Raise remaining wait jobs to timeout-minutes: 40
#  3. Raise Quick Check job to timeout-minutes: 25
#  4. running-workflow-name must match this workflow's name:
# See LESSON-021, agent_docs/github_actions_patterns.md

Insta snapshot fails only on macOS

# Cause: f32/f64 {:?} Debug differs by platform
# Fix: format!("{:.4}", value) before assert_snapshot!
# See LESSON-022

Fix Commands

# Linting
cargo fmt --all
cargo clippy --workspace --fix --allow-dirty

# Testing
cargo test --workspace -- --nocapture

# Security
cargo audit
cargo deny check

# Build
cargo build --workspace

Success Criteria

• All CI jobs pass
• No new warnings introduced

Codecov Patch Coverage Gap Fix

When Codecov reports "Patch coverage is X% with N lines missing coverage":

Step 1: Parse the Report

Identify files with missing lines from the Codecov comment:

| File | Patch % | Missing Lines |
|------|---------|---------------|
| path/to/file.rs | 0.00% | 24 Missing |

Step 2: Locate Uncovered Code

For each file, read the specific lines identified. They are typically:

• New functions without tests
• Extracted submodules (refactored code moved to new files)
• Changed branches not exercised by existing tests

Step 3: Write Targeted Tests

Add tests to the existing #[cfg(test)] mod tests in each file, or to a sibling test file:

• For new public functions: unit test exercising the function directly
• For new structs: test Default, Debug, Clone impls + key methods
• For refactored code: test that the extracted module works identically to before
• For branch coverage: test each match arm / if-else branch

Step 4: Verify

cargo nextest run -p <crate> -E 'test(<test_name_pattern>)'
cargo clippy --workspace -- -D warnings

Step 5: Commit

Single atomic commit: test(coverage): add tests for Codecov patch gaps in N files

Common Patterns

• Extracted submodule (e.g. stats.rs from wrapper.rs): test the new module's public API directly
• New monitoring metric: test the recording method + snapshot/getter
• New heuristic function: test boundary conditions (empty input, short/long input, edge cases)
• New StorageType enum: test Debug, Clone, and pattern matching
• Changes committed if needed