Experimental package — This module provides a set of MCP tools to retrieve information from GitHub
Free
Nothing to run from here
Kernlang is installed from its publisher's own source and answers where it runs, so this marketplace is not in the path of a single call. There is no address here to send one to, and a panel that pretended otherwise would be showing you an answer we made up. Install it and call it from your own client — the Installation tab has the entry for each one.
Open Installation—
p95 latency
—
call success
local
runs on your machine
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calls last 7d
What it does
KERN MCP server — compile, review, and analyze .kern files via MCP
Quickstart
# 1 — run it from where its publisher ships it
npx -y @kernlang/mcp-server
# 2 — ask your agent something
> KERN MCP server — compile, review, and analyze .kern files via MCP
Kernlang is free: there is no plan to choose, no cap to set and nothing that can bill you.
Publishernot claimed
KEAll 1 server
@kernlang1 server
1 category
Collected from a public index. Nobody has claimed this account, so nothing here was written by its author — claim it if it is yours.
Installation
Where are you running it?
Every route below installs the same thing and ends at the same approval screen. This one runs on your machine: your client starts Kernlang as a process under your own user, with your files and your network, so the tool surface below is what it can do to your computer rather than to a server somewhere else. It is scanned, signed and pinned to the version you choose — read the surface before you approve it.
Claude Codedeclared by this listing
This is a public server: you run it yourself and this marketplace is not in the path. Claude Code registers it in one command.
claude mcp add kernlang-mcp -- npx -y @kernlang/mcp-serverReconnect, or start a new session, and the tools appear in the model’s tool list.
Free to install, and it runs from its publisher’s own package: no account, no key, no card.
What it writes
One config entry your client uses to start the process locally. A local server runs with your file system and your network, which is why it is priced without metering.
What you approve
15 tools, with what each one reads, writes and reaches shown before you agree — the same list on every route above. Read the tool surface.
Tool surface
What the model actually sees. Descriptions are diffed on every release — see version history.
Compile .kern source code to a target framework (Next.js, React, Vue, Express, FastAPI, MCP, etc.). Returns generated code.
Takes no parameters.
Example callreturns →
Run KERN static analysis (76+ rules, taint tracking, OWASP) on TypeScript/JavaScript source code.
Takes no parameters.
Example callreturns →
Lint .kern source code for structural issues, missing props, and pattern violations.
Takes no parameters.
Example callreturns →
Scan MCP server TypeScript/Python code for security vulnerabilities. 13 rules mapped to OWASP MCP Top 10. Returns findings + security score (0-100, A-F).
Takes no parameters.
Example callreturns →
Parse .kern source and return the KERN IR (intermediate representation). Useful for debugging and understanding structure.
Takes no parameters.
Example callreturns →
Decompile a parsed KERN IR tree back to human-readable .kern text. Useful for reformatting or inspecting parsed output.
Takes no parameters.
Example callreturns →
Validate .kern syntax without compiling. Returns parse errors or success.
Takes no parameters.
Example callreturns →
List all available KERN compile targets.
Takes no parameters.
Example callreturns →
List KERN node types with their properties and allowed children. Use this to understand what props a node accepts.
Takes no parameters.
Example callreturns →
Compile .kern source and return structured JSON diagnostics (code, line, col, suggestion). Use this for programmatic self-correction.
Takes no parameters.
Example callreturns →
Compile .kern to a secure MCP server (TypeScript or Python), then auto-scan the compiled output for security vulnerabilities. Returns code + security score + findings in one call.
Takes no parameters.
Example callreturns →
Scan MCP configuration files (Claude Desktop, Cursor, VS Code, Windsurf) for hardcoded secrets, missing version pins, and wide permissions. Scans the host machine config files.
Takes no parameters.
Example callreturns →
Generate security test cases from .kern source. For each tool and guard, generates valid + malicious inputs to verify guards block attacks. Returns a vitest test file.
Takes no parameters.
Example callreturns →
Connect to locally configured MCP servers (Claude Desktop, Cursor, VS Code, Windsurf), retrieve their tool lists, and check for poisoning patterns (hidden instructions, cross-origin escalation, tool shadowing, data exfiltration). Returns findings per server.
Takes no parameters.
Example callreturns →
KERN language specification — grammar, node types, style shorthands, all compile targets
Takes no parameters.
Example callreturns →
Freeyour plan
$0 forever
- Every tool, no call limit
- No card, no account needed
- Source published under a licence you can read
- Runs on your machine — nothing of it reaches our gateway
- Nothing to cap, because nothing bills
What counts against your monthly calls
| Tool | Unit | Calls used | Out of the allowance |
|---|
Nothing here is billable. Kernlang costs nothing to install and nothing to call, at any volume.
Call allowance · this installenforced at the gateway
Monthly allowance, in calls
—
—
Alert at 80% · then the tool returns a normal MCP error
Used this month: $8.42
$16.58 left
ATrust score 99 / 100
Release 4.5.0 · scanned 25 Aug 2026
Two independent axes, because powerful and malicious are different questions. The grade is threat only. The capability level is blast radius, and it is never a penalty on the grade — it is priced as one subtract-only term in the score, where you can see it.
Threat score100
Client score99
Findings0 threat · 0 capability
Capabilityminimal
Coveragesource
Verificationrepo
Surface digestbe608801dcd1e15f1bbb49d6caeb087ce106b78d70bdee205567560dfd386426
Score vectorthreat 100 → client 99
| Term | Level | What it prices | Points |
|---|---|---|---|
| capability-exposure | minimal | capability blast radius (minimal) — client exposure if the model is manipulated | −0 |
| verification-discount | repo | publisher verification (public source) — no provenance, but the source is public and inspectable | −1 |
| coverage-honesty | source | inspection depth (source) — how much of the target the scan could see | −0 |
score = clamp(round(threatScore − E_cap − E_ver − E_cov), 0, 100). No model, no opinion, no network call at scoring time: the same methodology version against the same bytes always produces this number, and every line above is a field of the report rather than a summary of it.
What the scan could actually read
A grade is only as meaningful as its coverage, so the scanner publishes its own depth before it publishes its result.
Tool surfaceread
Implementation sourceread
Package metadataread
Live transportnot available
Tools were statically extracted from the published source (16 recovered), not enumerated from a running server. Tool-poisoning, Unicode-smuggling, capability and toxic-flow analysis ran on this inferred surface, but a mis-parsed registration could be missed or mis-attributed, so tool-derived findings are capped below “confirmed”. To grade the real runtime surface, scan the running server: --command "npx -y <package>".
Capability — what it could do if the model were manipulated
Tags derived from each tool’s schema and the implementation, not from what the tool calls itself. minimal is the level these add up to.
| Tool | Capability tags | Why the tag was assigned |
|---|---|---|
| compile | no tags | |
| review | no tags | |
| review-kern | no tags | |
| review-mcp-server | no tags | |
| parse | no tags | |
| decompile | no tags | |
| validate | no tags | |
| list-targets | no tags | |
| list-nodes | no tags | |
| schema | no tags | |
| compile-json | no tags | |
| compile-and-review | no tags | |
| audit-mcp-config | no tags | |
| generate-security-tests | no tags | |
| inspect-mcp-servers | no tags | |
| verify-tool-pins | no tags |
Toxic-flow graph
The lethal trifecta, checked as a graph rather than as a checklist: untrusted input, a sensitive source and an external sink have to meet before there is a path worth worrying about.
The public result for this release does not print the flow graph, so there is nothing to show here. That is not the same as "no paths were found": what the scan did read is above, under coverage.
Supply chain and provenance
Integrityfirst-seen
Surface digestbe608801dcd1e15f
Scanned2026-08-25
This is the first scan of this surface here, so there is nothing yet to compare it against.
Every result on this tab comes from one deterministic pass over the published package — offline, rule by rule, and auditable line by line above. Same methodology version, same bytes, same score.
Release history
Pinned to 4.5.0 — the install command below asks for that release. A pin is part of an install, so it is kept for this visit and written down when you install.
4.5.0
undated
installedNo release note was published with this version.
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no reviews yet
Reviews are earned
Only accounts with at least 50 real tool calls against this server in the last 90 days can post. Ratings are weighted by how much the reviewer actually uses it, and publishers can reply once per review.
Reviews are earned
Writing one takes an account with at least 50 real tool calls against Kernlang in the last 90 days. That is the whole gate — there is no other way to post, which is why the counts beside each review are worth reading.
No reviews yet
Nobody has reviewed this listing. The rating on the card is the mean of the reviews written here and nothing else, so there is no rating until somebody writes the first — which takes an account with 50 real tool calls against it.