From nx
Use when tests fail, exceptions occur, or behavior is non-deterministic, especially after 2+ failed manual fix attempts
npx claudepluginhub hellblazer/nexus --plugin nxThis skill uses the workspace's default tool permissions.
Delegates to the **debugger** agent (model: opus).
Performs root cause analysis for bugs by tracing errors through code, analyzing stack traces, forming and testing hypotheses, then hands off to fix. Auto-triggers on stack traces.
Enforces systematic root cause analysis before fixes for bugs, test failures, unexpected behavior, performance issues, and build failures.
Enforces root cause investigation for bugs, test failures, unexpected behavior, and performance issues through four phases before proposing fixes.
Share bugs, ideas, or general feedback.
Delegates to the debugger agent (model: opus).
REQUIRED SUB-SKILL: Use nx:serena-code-nav for all symbol-level navigation during debugging. Serena gives accurate call traces; Grep finds text matches that may be comments or strings.
jet_brains_find_referencing_symbols on failing methods to find all callersjet_brains_find_symbol on exception types to locate definitionsjet_brains_type_hierarchy for polymorphic call resolutionjet_brains_get_symbols_overview before reading a file1. Identify failing test/exception
2. jet_brains_find_symbol on failure point — locate definition
3. jet_brains_find_referencing_symbols to trace all callers
4. jet_brains_type_hierarchy for polymorphic dispatch questions
5. Form hypothesis based on Serena evidence
6. Validate with `mcp__sequential-thinking__sequentialthinking`
Use the Agent tool to invoke debugger:
## Relay: debugger
**Task**: [what needs to be done]
**Bead**: [ID] or 'none'
### Input Artifacts
- Files: [relevant files]
### Deliverable
Root cause analysis with fix recommendation
### Quality Criteria
- [ ] Root cause definitively identified with evidence
- [ ] Fix proposed and validated
- [ ] Hypothesis chain preserved
For full relay structure and optional fields, see RELAY_TEMPLATE.md.
The debugger uses mcp__sequential-thinking__sequentialthinking:
debug-{component}-{issue-type}Outputs generated by the debugger agent:
Session Scratch (T1): Agent uses scratch tool for ephemeral working notes during the session. Flagged items auto-promote to T2 at session end.