graphenlabs_
a Graphenlabs product

Coval. The reliability layer for AI coding.

Coval makes AI coding agents trustworthy in your repo. It catches the APIs they invent, keeps their context grounded in what your code actually is, and keeps your codebase clean enough for them to keep working in — so the code your agent ships is correct, not just plausible. It's free to use and plugs into the tools you already use.

Open Coval See pricingnpx coval scan .
coval · health report
B+
health grade
▲ from C · 7-day trend
findings5 worth your time
  • HIGHauth/session.tsDuplicate of token-refresh in api/client.ts (0.94)
  • HIGHlib/payments.tsHallucinated import: `stripe/v3-helpers` does not exist
  • MEDutils/date.tsDead code — `formatLegacy()` has 0 callers
  • MEDcore/graph.tsHub function: 11 callers, complexity 34 — split candidate
  • LOWui/Modal.tsxPossibly misplaced — belongs in components/overlay
why coval

A feedback loop that keeps agents honest

AI agents drift and hallucinate because they don't have accurate, lasting context about your codebase. Coval gives them that — and gives you proof.

Stops hallucinations before they land

Flags imports, methods, and environment variables the AI invented that don't actually exist in your project.

Keeps your AI's context true

Maintains a grounded project briefing from real analysis, so your agent stays oriented as the code changes instead of guessing.

Keeps your code AI-legible

Surfaces duplication, dead code, and architecture drift before they rot the codebase and confuse the next agent.

Gives you one number to trust

A single health grade with a trend over time, so you know whether AI-assisted changes are improving the code or eroding it.

what it catches

A real analysis engine, not regex

Genuine graph + spectral analysis of your actual code — ranked, framework-aware, and tuned to your conventions.

Hallucination detection

Catches AI-invented APIs — imports, methods, named exports, and environment variables that don't exist.

Duplicates

Finds duplicate and near-duplicate code the AI re-created instead of reusing, grouped and ranked so you fix the real ones first.

Dead code

Surfaces unused and unreachable functions — and knows your framework's entry points (Next.js, Remix, SvelteKit, NestJS, and more) so it won't flag the wrong things.

Architecture drift

Highlights tangled structure, overloaded "hub" functions, misplaced code, and tightly coupled files — the drift that makes a codebase harder for both people and agents.

🚧 Coming soon

Dependency & tooling health

Unused and undeclared dependencies, project hygiene checks (lint, formatting, strict typing, CI), and an opt-in outdated-dependency scan.

Health grade

One 0–100 score and letter grade, tracked over time as a trend you can act on.

Smart noise control

Learns your project's conventions and intent — and recognizes common, intentional patterns — so it suppresses false positives instead of nagging you.

where you use it

One engine, everywhere you code

The same local analysis renders in your editor, your terminal, and any agent that speaks MCP.

✅ available🚧 coming soon

MCP server

coval-mcp

Plug Coval straight into Claude Code, Cursor and Codex so your agent works against grounded context. Live analysis tools today; grounded-context generation and change self-checks next.

🚧 Available

Embedded agent

A Claude-powered assistant that can scan, preview a fix, apply it, and open a fix branch or PR for you.

✅ Available

VS Code extension

Findings in the gutter, hover & inline insights, a live health report, impact analysis, and an architecture map — right in your editor.

✅ Available

CLI

coval

A terminal scan with a clean, readable report. Drops into CI to gate on serious findings before they merge.

✅ Available

Web dashboard

Cloud-synced reports, history, accounts, and team plans.

🚧 Coming soon
languages

JS/TS first, more in progress

Full support

JavaScript / TypeScript (including JSX / TSX)

Experimental

Python · Go · Rust · Java

Structure & architecture insights. Some checks — like hallucination detection — are JS/TS-only for now.

Free, and built to be used

Coval's core — the CLI, MCP server and VS Code extension — is free, with no account required. It plugs into the AI tools you already use, and you decide what, if anything, ever syncs to the cloud.

free core · no account · opt-in sync
in your pipeline

Gate the merge, not just the editor

The CLI emits the same report your editor shows. Drop it into CI to catch hallucinated APIs and serious findings before AI-assisted changes ever merge.

Open Coval See pricing
terminal
# interactive scan
npx coval scan .

# gate CI on serious findings
npx coval scan . --ci

✗ 2 hallucinated imports  · build failed
✓ Grade B+ · trending up