Onsystem MCP Server
by dgestevesKeeps coding agents on your design system: catches palette colors, native elements and APIs your system lacks, at every edit and pull request, with the fix. Set it up once in your design-system package; every app in your monorepo gets it.
Onsystem is an open-source mcp server by dgesteves, written mainly in TypeScript, with 165 GitHub stars and the MIT license. Its code was last updated Oct 30, 2026.
Scan summary: scanned Nov 5, 2026 at commit 6425861. Seen able to read environment and secrets, connect to the internet. Scan policy
ScannedScanned. The automated checks below ran on the commit shown. Read each line for what was and was not covered.
Full scan at
6425861 · Nov 5, 2026 ScannedStatic, secrets and dependency checks completed with no critical findings. BuildsIt installed from a fresh machine. BootsIt started, and MCP servers answered the protocol handshake. No undeclared egressWhile running it only contacted the domains it declared. ReproducibleEarned in this scan.
Warning. This check found something worth reading in the findings below. It is not proof of a problem.Static code scanwarnWarning. This check found something worth reading in the findings below. It is not proof of a problem.
Flagged. This check found an issue. See the findings below.Secrets scanfailFlagged. This check found an issue. See the findings below.
Passed. This check ran and found nothing it flags.Dependency audit1 known vulnerabilitiespassPassed. This check ran and found nothing it flags.
Passed. This check ran and found nothing it flags.Manifestserver.jsonpassPassed. This check ran and found nothing it flags.
Passed. This check ran and found nothing it flags.BuildpassPassed. This check ran and found nothing it flags.
Passed. This check ran and found nothing it flags.Boot & handshake5 toolspassPassed. This check ran and found nothing it flags.
Passed. This check ran and found nothing it flags.Network egresspassPassed. This check ran and found nothing it flags.
Passed. This check ran and found nothing it flags.Reproducible (×3)passPassed. This check ran and found nothing it flags.
Findings (64)
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.exfiltration issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.credential-access issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.credential-access issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.credential-access issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.secrets issueDetails are available to the maintainer after claiming this listing.
- lowLow. Minor, or common in normal tools. Shown for information.Possible example credential in docs/tests: generic-api-key
test/changelog.test.ts:102 - lowLow. Minor, or common in normal tools. Shown for information.minimatch@10.2.6: 1 known vulnerabilityGHSA-g3hv-75wg-m249
pnpm-lock.yaml - lowLow. Minor, or common in normal tools. Shown for information.Reads environment variables not listed in the manifestNEXT_PUBLIC_BASE_PATH, BENCH_WORK_DIR, ONSYSTEM_HOOK_TIMEOUT, ONSYSTEM_BIN, DESIGN_SYSTEM_MCP_BIN, CLAUDE_PROJECT_DIR, ONSYSTEM_NPX, CORPUS_DIR, OPENAI_CHAT_MODEL, ONSYSTEM_REMEMBER_CLI, NO_COLOR
Network activity
During install
registry.npmjs.org
While running
No connections
Tools exposed (5)
list_componentsList every component in the project design system with a one-line description, the native element it renders, its variant values, its parts and its import. Icons (components that render an <svg>) are named on one line per import, or per folder for icons with a module each, five or more to a line. Ca
get_componentGet the full contract of one component: import, props with types and defaults, cva variants and the classes each applies, parts (sub-components), design tokens it uses, usage guidelines and examples from its docs. Call it before using a component. Accepts "Button", "CardHeader" or "Card.Header". At
search_componentsFind components by what you want to build, e.g. "confirm a destructive action", "status label", "text field with validation". Ranks names, descriptions, docs, props and variant values with BM25 (local, no API key). When no component clearly matches, it says so and lists the nearest, marked `weak`. U
get_tokensList design tokens with resolved values, dark-mode values and how to use each (Tailwind class or CSS variable). Filter by category (color, spacing, radius, typography, shadow, other) or a substring. Use these instead of hex codes, px values or Tailwind default palette classes. Chart and sidebar colo
check_uiLint TSX/JSX against the design system. Reports hardcoded colors, spacing and radius (with the nearest token), native elements that have a design-system component, unknown components, props and variant values, and icon-only buttons without an accessible name. Each diagnostic has line/column, a rule
Automated result for the commit shown. See our scan policy. View the scan log
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