51 lines
3.4 KiB
Markdown
51 lines
3.4 KiB
Markdown
---
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name: logic-explain
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description: Explain what a specific piece of code actually does for a given input by producing a step-by-step execution trace (interprocedural, with name resolution and type transitions). Trigger when the user is confused about behavior or asks why code produces X instead of Y — "walk me through...
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risk: unknown
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source: https://github.com/hyhmrright/logic-lens/tree/main/skills/logic-explain
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source_repo: hyhmrright/logic-lens
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source_type: community
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date_added: 2026-07-01
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license: MIT
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license_source: https://github.com/hyhmrright/logic-lens/blob/main/LICENSE
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---
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# Logic-Lens — Execution Explain
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## When to Use
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Use this skill when you need explain what a specific piece of code actually does for a given input by producing a step-by-step execution trace (interprocedural, with name resolution and type transitions). Trigger when the user is confused about behavior or asks why code produces X instead of Y — "walk me through...
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## Setup
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Use lazy loading per `../_shared/common.md` §13:
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1. Read `../_shared/common.md` only for language, report header variants, scope routing, and loading budget.
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2. Read only the relevant step in `logic-explain-guide.md` as you reach it.
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3. Load `../_shared/semiformal-guide.md`, `../_shared/semiformal-checklist.md`, and `../_shared/report-template.md` on demand when the current step needs them.
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Note: `logic-risks.md` is intentionally skipped — logic-explain does not produce L-code findings, and Remedy is intentionally out of scope for this mode. If the trace reveals a bug, stop and recommend logic-review or logic-locate. When handing off, do not discard work already done — present the premises established and trace steps completed under a **"Partial trace context (carry into next skill):"** heading so the user can pass them directly to the follow-on skill.
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## Process
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**Step 0. Language + scope routing.** Detect language per `common.md` §1. Confirm a single function + a single input scenario. If the user wants bug-finding without a scenario, hand off to logic-review.
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**Step 1. Entry point and scenario** (guide Step 1) — name the function, the input scenario, and what the user is trying to understand.
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**Step 2. Build premises** (guide Step 2) — resolve every non-obvious name, state the types of key variables at entry, note global/module state accessed.
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**Step 3. Produce step-by-step trace** (guide Step 3) — numbered, interprocedural, active voice; cross function boundaries whenever relevant to the user's scenario. Keep the trace scenario-bound; do not branch into alternative paths unless they explain the user's confusion.
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**Step 4. Highlight non-obvious behavior** (guide Step 4) — name resolutions, implicit coercions, hidden side effects; the "gotchas" the casual reader would miss.
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**Step 5. Summarize actual vs. assumed** (guide Step 5) — one sentence each; this is the core value for the user.
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**Mode line in report:** `Execution Explain` (Chinese: `执行解释`).
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**Note:** Execution Explain is descriptive, not evaluative. Omit the Logic Score / Fault Confidence / Verdict line from the report header.
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## Limitations
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- Use this skill only when the task clearly matches its upstream source and local project context.
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- Verify commands, generated code, dependencies, credentials, and external service behavior before applying changes.
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- Do not treat examples as a substitute for environment-specific tests, security review, or user approval for destructive or costly actions.
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