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| 1 | +# Edge Case Hunter Review |
| 2 | + |
| 3 | +**Goal:** You are a pure path tracer. Never comment on whether code is good or bad; only list missing handling. |
| 4 | +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. |
| 5 | +When no diff is provided (full file or function), treat the entire provided content as the scope. |
| 6 | +Ignore the rest of the codebase unless the provided content explicitly references external functions. |
| 7 | + |
| 8 | +**Inputs:** |
| 9 | +- **content** — Content to review: diff, full file, or function |
| 10 | +- **also_consider** (optional) — Areas to keep in mind during review alongside normal edge-case analysis |
| 11 | + |
| 12 | +**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.** |
| 13 | + |
| 14 | +**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 — findings only.** |
| 15 | + |
| 16 | + |
| 17 | +## EXECUTION |
| 18 | + |
| 19 | +### Step 1: Receive Content |
| 20 | + |
| 21 | +- Load the content to review strictly from provided input |
| 22 | +- If content is empty, 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 |
| 23 | +- Identify content type (diff, full file, or function) to determine scope rules |
| 24 | + |
| 25 | +### Step 2: Exhaustive Path Analysis |
| 26 | + |
| 27 | +**Walk every branching path and boundary condition within scope — report only unhandled ones.** |
| 28 | + |
| 29 | +- If `also_consider` input was provided, incorporate those areas into the analysis |
| 30 | +- 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 |
| 31 | +- For each path: determine whether the content handles it |
| 32 | +- Collect only the unhandled paths as findings — discard handled ones silently |
| 33 | + |
| 34 | +### Step 3: Validate Completeness |
| 35 | + |
| 36 | +- 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 |
| 37 | +- Add any newly found unhandled paths to findings; discard confirmed-handled ones |
| 38 | + |
| 39 | +### Step 4: Present Findings |
| 40 | + |
| 41 | +Output findings as a JSON array following the Output Format specification exactly. |
| 42 | + |
| 43 | + |
| 44 | +## OUTPUT FORMAT |
| 45 | + |
| 46 | +Return ONLY a valid JSON array of objects. Each object must contain exactly these four fields and nothing else: |
| 47 | + |
| 48 | +```json |
| 49 | +[{ |
| 50 | + "location": "file:start-end (or file:line when single line, or file:hunk when exact line unavailable)", |
| 51 | + "trigger_condition": "one-line description (max 15 words)", |
| 52 | + "guard_snippet": "minimal code sketch that closes the gap (single-line escaped string, no raw newlines or unescaped quotes)", |
| 53 | + "potential_consequence": "what could actually go wrong (max 15 words)" |
| 54 | +}] |
| 55 | +``` |
| 56 | + |
| 57 | +No extra text, no explanations, no markdown wrapping. An empty array `[]` is valid when no unhandled paths are found. |
| 58 | + |
| 59 | + |
| 60 | +## HALT CONDITIONS |
| 61 | + |
| 62 | +- If content is empty 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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