What are PR summaries and walkthroughs?

A summary gives a reviewer the shape of a change before they read it: what moved, what is risky, where to look first. On large pull requests this can shorten the time to a first meaningful review.

It helps most where PR hygiene is weakest, such as sparse descriptions, large diffs or unfamiliar areas of the codebase. It does not improve the change itself, and a generated summary describes what changed rather than why, which only the author can supply.

What to look for

Whether summaries are posted automatically or on request
Handling of very large diffs, where context limits start to bite
Whether generated text overwrites or preserves the author's description
Walkthrough quality on multi-file architectural changes

Best 14 code quality, security and code review tools with PR summaries and walkthroughs

Every tool in the directory whose documentation covers this, 6 fully and 8 partially. Full support is shown first. Shown in a random order that changes on every visit, so no tool gets an advantage from its position.

Support is not the same as parity, since some implementations are narrower in scope, gated to a higher plan tier, or maintained only for existing customers. The note under each tool is what its own documentation describes.

AI Coding Agent

Claude Code

Review body summary plus severity-sorted check-run Details; REVIEW.md can reshape its format.

PR Review Tool

CodeRabbit

Summary plus Walkthrough with Mermaid diagrams, review-effort score, related issues; Free includes summaries

Code Quality Platform

DeepSource

Report Card carries AI-generated narrative feedback plus a pull-request summary comment.

AI Coding Agent

Gemini Code Assist

Auto-generated natural-language PR summary on open, plus on-demand '/gemini summary'.

PR Review Tool

Greptile

PR summary with 0-5 confidence score, per-file issues, auto-generated sequence diagrams or flowcharts

PR Review Tool

Qodo

AI PR summary plus walkthrough with description, architecture diagram, high-level assessment

Code Security Platform

Checkmarx One

PR comment summarizes new and fixed vulnerabilities and policy violations; no change-by-change walkthrough.

Code Quality Platform

Codacy

AI-generated issue summaries and remediation suggestions on PRs; no change-by-change walkthrough described.

Code Quality Platform

CodeScene

Virtual code review breaks down Code Health issues and improvements per PR; no AI narrative summary of the change

PR Review Tool

Cursor (Bugbot)

Code Tour walkthroughs and agent diff summaries ship in Cursor Review, currently closed beta.

Code Security Platform

GitHub Advanced Security

Manifest diffs render a rich dependency-change summary; no whole-PR summary or walkthrough documented

Code Quality Platform

Qlty

Summary comment lists new issues grouped by check and coverage per file; no AI narrative walkthrough

Code Security Platform

Semgrep

PR/MR comments summarize findings; Autofix draft PRs carry an AI-written description.

Code Security Platform

Snyk

Aggregated issue summary comment per PR by severity and type, updated in place on new commits.

AI Logic Bug Detection Autofix Suggestions Autofix Pull Requests AI Triage (False-Positive Filtering)

FAQ