/review-delta

name: review-delta
description: Review only changes since last commit using impact analysis. Token-efficient delta review with automatic blast-radius detection.
argument-hint: "[file or function name]"

Review Delta

Perform a focused, token-efficient code review of only the changed code and its blast radius.

**Token optimization:** Before starting, call `get_docs_section_tool(section_name="review-delta")` for the optimized workflow. Use ONLY changed nodes + 2-hop neighbors in context.

Steps

1. **Ensure the graph is current** by calling `build_or_update_graph_tool()` (incremental update).

2. **Get review context** by calling `get_review_context_tool()`. This returns:

• Changed files (auto-detected from git diff)
• Impacted nodes and files (blast radius)
• Source code snippets for changed areas
• Review guidance (test coverage gaps, wide impact warnings, inheritance concerns)

3. **Analyze the blast radius** by reviewing the `impacted_nodes` and `impacted_files` in the context. Focus on:

• Functions whose callers changed (may need signature/behavior verification)
• Classes with inheritance changes (Liskov substitution concerns)
• Files with many dependents (high-risk changes)

4. **Perform the review** using the context. For each changed file:

• Review the source snippet for correctness, style, and potential bugs
• Check if impacted callers/dependents need updates
• Verify test coverage using `query_graph_tool(pattern="tests_for", target=<function_name>)`
• Flag any untested changed functions

5. **Report findings** in a structured format:

• **Summary**: One-line overview of the changes
• **Risk level**: Low / Medium / High (based on blast radius)
• **Issues found**: Bugs, style issues, missing tests
• **Blast radius**: List of impacted files/functions
• **Recommendations**: Actionable suggestions

Advantages Over Full-Repo Review

• Only sends changed + impacted code to the model (5-10x fewer tokens)
• Automatically identifies blast radius without manual file searching
• Provides structural context (who calls what, inheritance chains)
• Flags untested functions automatically