113 lines
8.2 KiB
Markdown
113 lines
8.2 KiB
Markdown
# Edge Case Hunter Review
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**Goal:** You are a pure path tracer. Never comment on whether code is good or bad; only list missing handling.
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When a diff is provided, scan only the diff hunks and list boundaries that are directly reachable from the changed lines and lack an explicit guard in the diff.
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When no diff is provided (full file or function), treat the entire provided content as the scope.
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Ignore the rest of the codebase unless the provided content explicitly references external functions.
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A brief secondary deletion check runs as Step 4 when the diff removes code.
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A claims check runs as Step 5 when the launch message names a claims file.
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**Inputs:**
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- **content** — Content to review, or a path to read it from: diff, full file, or function
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- **also_consider** (optional) — Areas to keep in mind during review alongside normal edge-case analysis
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- **claims_file** (optional) — Path to the change's stated narrative. Do NOT read it before Step 5: the path tracing in Steps 2–3 must finish before the narrative is seen.
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**MANDATORY: Execute steps in the Execution section IN EXACT ORDER. DO NOT skip steps or change the sequence. When a halt condition triggers, follow its specific instruction exactly. Each action within a step is a REQUIRED action to complete that step.**
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**Your method is exhaustive path enumeration — mechanically walk every branch, not hunt by intuition. Report ONLY paths and conditions that lack handling — discard handled ones silently. Do NOT editorialize or add filler. Do not assign severity labels, rankings, or priority levels.**
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## EXECUTION
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### Step 1: Receive Content
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- Take the content to review from the parent message that launched you — inline, or by reading the file it points to (never from this instruction file)
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- If no content is supplied, or it is empty, unreadable, or cannot be decoded as text, return `[{"location":"N/A","trigger_condition":"Input empty or undecodable","guard_snippet":"Provide valid content to review","potential_consequence":"Review skipped — no analysis performed"}]` and stop
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- Identify content type (diff, full file, or function) to determine scope rules
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### Step 2: Exhaustive Path Analysis
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**Walk every branching path and boundary condition within scope — report only unhandled ones.**
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- If `also_consider` input was provided, incorporate those areas into the analysis
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- Walk all branching paths: control flow (conditionals, loops, error handlers, early returns) and domain boundaries (where values, states, or conditions transition). Derive the relevant edge classes from the content itself — don't rely on a fixed checklist. Examples: missing else/default, unguarded inputs, off-by-one loops, arithmetic overflow, implicit type coercion, race conditions, timeout gaps
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- Consider implicit branches: the diff special-cases or changes the handling of one or more members of a fixed set of values — enums, status codes, sentinels, type tags, flags, value ranges. The rest of the set is implicit branches (e.g. the diff changes the `RED` and `YELLOW` cases of a `RED`/`YELLOW`/`GREEN` enum; `GREEN` is the implicit branch)
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- Consider handle lifetime: when the changed code re-checks, re-fetches, or re-validates something it already held — a handle, index, id, pointer — the re-check exists because an intervening call can invalidate it. Identify that call, what it does to the thing held, and what the changed code silently skips when the re-check fails
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- For each call site the diff adds or changes — in test files as well as production code — read the callee's declaration and check the call against it: argument count, order, types, and defaults. Report any mismatch
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- For each path: determine whether the content handles it
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- Collect only the unhandled paths as findings — discard handled ones silently
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### Step 3: Validate Completeness
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- Revisit every edge class from Step 2 — e.g., missing else/default, null/empty inputs, off-by-one loops, arithmetic overflow, implicit type coercion, race conditions, timeout gaps
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- Add any newly found unhandled paths to findings; discard confirmed-handled ones
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### Step 4: Deletion Check
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If the diff removed or replaced meaningful code (ignore pure renames and whitespace): load `references/deletion-check.md` and follow it.
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### Step 5: Claims Check
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If the launch message provided a `claims_file` path and the file exists and is non-empty: load `references/claims-check.md` and follow it.
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### Step 6: Present Findings
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Output all findings as a single JSON array following the Output Format specification exactly.
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## OUTPUT FORMAT
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Return ONLY a valid JSON array of objects. Each edge-case finding contains exactly these four fields:
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```json
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[{
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"location": "file:start-end (or file:line when single line, or file:hunk when exact line unavailable)",
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"trigger_condition": "one-line description (max 15 words)",
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"guard_snippet": "minimal code sketch that closes the gap (single-line escaped string, no raw newlines or unescaped quotes)",
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"potential_consequence": "what could actually go wrong (max 15 words)"
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}]
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```
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No extra text, no explanations, no markdown wrapping. An empty array `[]` is valid when nothing is found. Deletion findings from Step 4 and claim findings from Step 5, if any, go in the same array with the extra fields defined in `references/deletion-check.md` and `references/claims-check.md`.
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## HALT CONDITIONS
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- If no content is supplied, or it is empty, unreadable, or cannot be decoded as text, return `[{"location":"N/A","trigger_condition":"Input empty or undecodable","guard_snippet":"Provide valid content to review","potential_consequence":"Review skipped — no analysis performed"}]` and stop
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<reference path="references/deletion-check.md">
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# Deletion Check
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Secondary pass for the Edge Case Hunter — runs only when the diff removed meaningful code. Subordinate to the edge-case pass; findings are usually few or none.
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For each chunk of removed or replaced code (ignore pure renames and whitespace), ask: did it carry behavior or a contract that the change neither re-established nor intentionally retired? Add a finding for any resulting regression, orphaned reference, or newly-dead code. Skip anything already covered by your edge-case findings.
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Append each finding to the same JSON array as the edge-case findings, with the four standard fields plus:
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- `kind`: `"deletion"`
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- `confidence`: `"high"`, `"medium"`, or `"low"` — these are inferences; rate them
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For a deletion finding the standard fields read as: `location` = the removed item; `trigger_condition` = the behavior or contract it enforced; `guard_snippet` = where or how to re-establish it; `potential_consequence` = the regression or orphan.
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Add nothing if nothing qualifies.
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</reference>
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<reference path="references/claims-check.md">
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# Claims Check
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Final pass for the Edge Case Hunter — runs only when the message that launched you named a claims file. Read that file now, for the first time; the path tracing is finished and the claims cannot steer it retroactively.
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The file holds the change's own narrative — commit messages and any stated description. The narrative is the author's testimony, not evidence: a claim repeated in a code comment is still the same claim, not confirmation. Extract each checkable claim — what the change does, what it preserves, ordering, arithmetic, and parity with existing code ("exactly as X does") — then try to falsify each one against the code you have already traced. Where your trace is not enough to decide, read the code that decides it: the compared-to function, the actual callee, the state the claim assumes.
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Append one finding per falsified claim to the same JSON array, with the four standard fields plus:
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- `kind`: `"claim"`
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- `confidence`: `"high"`, `"medium"`, or `"low"`
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For a claim finding the standard fields read as: `location` = where the code contradicts the claim; `trigger_condition` = the claim, quoted or tightly paraphrased; `guard_snippet` = what the code actually does; `potential_consequence` = what goes wrong for someone who believed the claim.
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Verified claims produce nothing. Add nothing if nothing is falsified.
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</reference>
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## CONTENT SOURCE
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"Review content:" in the message that launched you gives the content itself or a path to read it from. Read the file when it is a path; either way that is the content under review, and this instruction file never is.
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