| name | reasoning-semiformally |
| description | Apply semi-formal certificate reasoning to code analysis — patch verification, fault localization, patch equivalence. Use when reviewing patches, hunting bugs across scopes, comparing fixes, tracing execution across files/modules, analyzing name shadowing or scope resolution, or checking for regressions. |
Semi-Formal Code Reasoning
Structured certificate templates that force mandatory checkpoints before conclusions.
Skip Conditions
Do NOT apply semi-formal reasoning when:
- The change is trivial: docs, formatting, version bumps, config changes
- The bug is locally obvious: typo, off-by-one in the same function, missing comma
- No execution paths cross scope boundaries
- The task is not code analysis (text editing, data extraction, summarization)
If any skip condition is met, proceed with standard reasoning.
Model-Specific Instructions
If you are Haiku-class (Haiku 4.5 or similar):
Read haiku.md in this skill directory. It contains full procedural templates with worked examples.
If you are Sonnet-class or above (Sonnet 4.6, Opus):
Read sonnet.md in this skill directory. It contains compact verification checkpoints.
Composing Tasks
For complex tasks, apply templates sequentially:
- Fault localization to find the bug
- Patch verification to validate a proposed fix
- Patch equivalence to compare alternative fixes
Each output feeds the next as premises.
