Arc Devtools MCP Server
@gabrielbryk/arc-devtools-mcp
npm
v1.3.1
Source verified
Published by gabrielbryk — publish provenance cryptographically ties this package to that repository. That is proof of origin, not an official vendor package.
Every server starts at 100. These are the exact deductions the deterministic engine applied — each one reproducible, none of it an opinion or an LLM's guess:
| Points | What was found | Category |
|---|---|---|
| −22 | Hardcoded Google API key in server code MTC-SRC-008 | exfiltration |
| −15.4 | Dynamic evaluation of a non-literal value MTC-SRC-010 | injection |
Grade capped: 1 confirmed high finding → grade capped at C. A hard gate overrides the point total — no amount of clean surface buys back a confirmed catastrophe.
Capability observations and info notes are shown under Findings but never scored.
Open any row's finding below for the file, line and evidence behind the deduction.
Findings 8
high Hardcoded Google API key in server code (build/src/tools/performance.js)MTC-SRC-008
A live-looking Google API key is hardcoded in `build/src/tools/performance.js:179`. Secrets in source ship to everyone who installs the package and are a direct credential leak.
Evidence: Google API key: AIza…(redacted)
Fix: Remove the secret, rotate it, and load credentials from the environment or a secret store.
Location: server build/src/tools/performance.js
high Dynamic evaluation of a non-literal value (build/src/third_party/devtools-heap-snapshot-worker.js)MTC-SRC-010
In the server's implementation (`build/src/third_party/devtools-heap-snapshot-worker.js:824`): Evaluating a runtime value as code (rather than a fixed literal) executes whatever reaches it — a direct RCE primitive, and almost never necessary in legitimate code. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: eval(
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/src/third_party/devtools-heap-snapshot-worker.js
high Dynamic code execution in server code (build/src/third_party/devtools-heap-snapshot-worker.js)MTC-SRC-001
In the server's implementation (`build/src/third_party/devtools-heap-snapshot-worker.js:824`): Evaluating strings as code is the most direct RCE primitive; if any tool input reaches it, the server executes attacker-chosen code. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: eval(
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/src/third_party/devtools-heap-snapshot-worker.js
high Shell/command execution in server code (build/src/bin/check-latest-version.js)MTC-SRC-002
In the server's implementation (`build/src/bin/check-latest-version.js:6`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: child_process
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/src/bin/check-latest-version.js
high Shell/command execution in server code (build/src/browser.js)MTC-SRC-002
In the server's implementation (`build/src/browser.js:6`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: child_process
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/src/browser.js
high Shell/command execution in server code (build/src/daemon/client.js)MTC-SRC-002
In the server's implementation (`build/src/daemon/client.js:6`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: child_process
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/src/daemon/client.js
high Shell/command execution in server code (build/src/telemetry/WatchdogClient.js)MTC-SRC-002
In the server's implementation (`build/src/telemetry/WatchdogClient.js:6`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: child_process
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/src/telemetry/WatchdogClient.js
high Shell/command execution in server code (build/src/utils/check-for-updates.js)MTC-SRC-002
In the server's implementation (`build/src/utils/check-for-updates.js:6`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: child_process
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/src/utils/check-for-updates.js
What this scan could not see
- No tools were enumerated, so prompt-injection, capability and toxic-flow analysis had no tool surface to inspect. To grade a package’s real runtime tools, scan the running server: --command "npx -y <package>".
Versions
Scan history per published version. The engine is deterministic — the same version always yields the same score, so a changed score means the package itself changed.
| Version | Score | Findings | Engine | Scanned |
|---|---|---|---|---|
v1.3.1 latest |
D 63/100 | 8 | 1.5.0 | 2026-07-22 |
Embed this score
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Verify this score yourself
The score above is reproducible: the same package version always yields the same result. Run it locally or over the free API — no account, no LLM, fully deterministic.
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