PlasmateBLOCK
Browser engine for agents. HTML in, structured Semantic Object Model out. Native MCP and AWP with a supported CDP subset. Apache-2.0.
Overview
From the repository's own README, as read at the audited commit. Badges and raw HTML are left out.
Plasmate
The browser engine for agents. HTML in. Semantic Object Model out.
Website · Docs · Benchmarks · Crates.io · npm · PyPI
Dependency and CI trust policy, local audit commands, and scorecard promotion rules are documented in Supply-chain policy.
Plasmate compiles HTML into a Semantic Object Model (SOM), a structured representation that LLMs can reason about directly. It runs JavaScript via V8 and implements a documented CDP subset for supported Puppeteer workflows. SOM output removes presentation and runtime markup; output size and tokenization are page-, configuration-, serialization-, and tokenizer-dependent.
75b1ad9b0f72OBSERVED · 2026-10-08Connect
Built from this server's own package name, version and transport as found in its source — not copied from anyone's documentation, so it cannot drift against a page we do not control. Replace the environment placeholders with a token scoped to the least it needs.
claude mcp add plasmate:v0.6.0 -- docker run -i --rm ghcr.io/plasmate-labs/plasmate:v0.6.0:0.6.0 mcp
Exposed tools (1)
1 read · 0 write · 0 destructive.
| Tool | Risk | Description |
|---|---|---|
read | read | Read |
Trust audit
BLOCKgrade D · trust 69/100 Do not install this without reading the findings. The audit found something that could harm you or your machine.
| Layer | What it checks | Result |
|---|---|---|
| L0 | Provenance & inventory | WARN |
| L1 | Static analysis of the code | FAIL |
| L2 | Instruction surface (what it tells the agent) | WARN |
| L3 | Class-specific surface | PASS |
| L4 | Behavioural (sandbox) | SKIPPED |
What the source does
- Filesystem
- declared (2 observation(s))
- Network
- declared (9 observation(s))
- Shell
- declared (1 observation(s))
- Dependencies
- not all pinned
- Secrets in source
- none-found
Findings (25)
pub fn eval(&mut self, expression: &str) -> Result<String, JsError> {"metadata.google.internal" | "metadata.azure.internal"
"http://169.254.169.254/latest/meta-data",
eprintln!(" plasmate fetch URL --insecure");awp_cdp_proxy-0.1.0-py3-none-any.whl
awp_cdp_proxy-0.1.0.tar.gz
- v0.1 caveat: without CSS computation, hidden detection uses heuristics (inline `style="display:none"`, `hidden` attribute, `aria-hidden`).
.vercelignore
'../../fixtures/action-availability.som.json',
'../../fixtures/action-availability.expected.json',
const REPO_ROOT = resolve(dirname(fileURLToPath(import.meta.url)), '../../..');
somBytes, err := os.ReadFile("../../integrations/fixtures/action-availability.som.json")expectedBytes, err := os.ReadFile("../../integrations/fixtures/action-availability.expected.json")if curl --fail --silent --show-error http://127.0.0.1:9222/json/version >/dev/null; then
curl --fail --silent --show-error http://127.0.0.1:9222/json/version >/dev/null
if curl --fail --silent --show-error http://127.0.0.1:8765/ >/dev/null; then
curl --fail --silent --show-error http://127.0.0.1:8765/ >/dev/null
The endpoint is `http://127.0.0.1:9272/mcp`. Every request must include
@ai-sdk/mcp, @types/node, ai, tsup, typescript
tsup, typescript, vitest
@types/node, typescript
marked
- curl -fsSL https://plasmate.app/install.sh | sh
curl -fsSL https://plasmate.app/install.sh | sh
curl -fsSL https://plasmate.app/install.sh | sh
Gates applied: no_behavioural_pass.
75b1ad9b0f72full audit observations/trust-audit/mcp-server/plasmate-labs__plasmate.json · Report an issue / request a re-scanAudit history
Every audit this server has had. A grade with a past is a grade somebody is still checking.
| Date | Source | Verdict | Grade | Score | Change |
|---|---|---|---|---|---|
| 2026-10-08 | 75b1ad9b0f72 | BLOCK | D | 69 | first audit |
Questions
What is the Plasmate MCP server?
Browser engine for agents. HTML in, structured Semantic Object Model out. Native MCP and AWP with a supported CDP subset. Apache-2.0.
What tools does Plasmate expose?
1 in total: 1 read-only, 0 that write, and 0 that can delete or overwrite. Every one is listed on this page with its risk.
Is Plasmate safe to connect to an agent?
No — not without reading the findings first. The audit graded it D (69/100) and found 4 critical or high issues in the source. Each one is listed on this page with the file and line it is on.
What credentials does Plasmate need?
It reads GITHUB_TOKEN from the environment. Give it a token scoped to the least it needs — an agent that can be talked into calling a tool can be talked into calling it with your credentials.
How does Plasmate run?
It speaks stdio and streamable-http, so it runs as a local process your client starts. It is published on npm as website at 1.0.0.
How current is this page?
The grade is for one exact copy of the source (75b1ad9b0f72), read on 2026-10-08. The repository is watched and re-audited when it changes.