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BugLens reviews every pull request before your team does - catching bugs, vulnerabilities, and style violations using your own codebase as context.
$ buglens review --pr 142
Fetching diff... 847 lines changed across 12 files
Running Lens agent -> Context agent -> Review agent
[!] auth/middleware.ts:34 - SQL injection risk
// User input directly interpolated into query string
[x] api/upload.ts:89 - No file size validation
// Max 10MB enforced in docs but not in code (see RFC-22)
[ok] utils/cache.ts - Matches team caching standard
-> Posted 3 inline comments to PR #142
-> Severity score: 6.4 / 10 | Request changes: yes
$
// see it in action
What your team
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BugLens posts structured review comments directly on your pull requests — with the bug, why it matters in your codebase, and the fix.
PR #142feat: add user authentication middleware
buglens reviewed
auth/middleware.ts
31 const user = await getUser(req.headers.authorization);
32 if (!user) return res.status(401).json({ error: 'Unauthorized' });
33 const q = `SELECT * FROM sessions WHERE token = ${req.body.token}`;
34 const q = db.prepare('SELECT * FROM sessions WHERE token = ?');
35 return q.get(req.body.token);
CRITICAL
SQL injection — user input interpolated directly into query string
The token from req.body.token is concatenated into the SQL string, letting an attacker manipulate the query. Matches OWASP A03:2021 — Injection.
From your Knowledge Base: RFC-22 mandates parameterized queries for all DB access. See the team pattern in
lib/db.ts:12.// how it works
Three agents.
One verdict.
BugLens uses a LangGraph pipeline of three specialised AI agents that work in sequence on every PR diff.
Lens agent
Parses diffs with AST analysis. Detects OWASP vulnerabilities, logic errors, and anti-patterns at the line level.
Context agent
Searches your team's docs, past PR comments, and standards via RAG. Every review knows your codebase.
Review agent
Writes structured inline comments with severity scores and one-click suggested fixes - posted directly on the PR.
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// knowledge base
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Write team conventions once as Lessons. BugLens applies them to every PR — catching violations your senior devs would flag, without needing them to review every diff.
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Your team's lessons3 active
Architecture
Never call the database directly from route handlers. Always go through the service layer in /lib/services.
Security
All user-facing file uploads must validate MIME type server-side. Do not trust the Content-Type header.
Patterns
Async functions that can fail must return a Result type. No bare try/catch at the call site.
Add a lesson...
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