capsulate (capsulatedev/capsulate) is an MCP server listed on the M8ven Trust Index. It scores 62 out of 100, grade C. It declares 15 tools. No publisher has claimed this listing.

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C
Caution
62/100

capsulate

Real Linux and Windows desktop VMs for AI agents: the TypeScript SDK, the cap CLI, the MCP server and agent tool packs (MIT)

→ capsulatedev/capsulate· listed on github_repo_search

Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.

How we verified

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Who stands behind it

capsulatedev

Source: github_repo_search

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Install from

GitHub

The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.

// key findings
⚠️
Known vulnerabilities in dependencies: 3 high
Affects packages this MCP installs at runtime. Upgrade or remove the affected dependency.
✅
No credential exfiltration, no sensitive file access, no obfuscation
Static analysis found nothing flowing your secrets to unexpected places.
✅
Open source with a license and README
Anyone can audit the code, the license is declared, and the publisher documents what it does.
🔐
You'll be asked for 1 credential: CAPSULATE_API_KEY
These are read from process.env at runtime. Make sure you trust where they’ll be sent.
// tools this server exposes15 tools

These names and descriptions are the publisher's own, read from the source code. We print them as written. Our assessment is the findings above, not this list.

capsulate_launch

Launch a new isolated cloud sandbox (capsule) and (by default) wait until it is ready. Returns the capsule id and connection info. Use the returned sessionId for exec/files/etc.

capsulate_list

List the team's active capsules.

capsulate_get

Fetch a capsule's full details by id.

capsulate_destroy

Terminate a capsule and release its resources.

capsulate_exec

Execute a command inside a capsule and return stdout, stderr, and the exit code. Provide the command as an argv array, e.g. ['ls','-la','/workspace'].

capsulate_run_code

Run a snippet of code inside a capsule (python, node, or bash). Returns stdout/stderr/exit.

capsulate_write_file

Write a UTF-8 text file inside a capsule.

capsulate_read_file

Read a UTF-8 text file from inside a capsule.

capsulate_set_env

Set environment variables inside a running capsule.

capsulate_screenshot

Capture a screenshot of a desktop capsule. Returns the image so you can see the screen.

capsulate_click

Click at pixel (x, y) in a desktop capsule. Pass screenshot:true to see the screen after the click.

capsulate_type

Type text into the focused field of a desktop capsule.

capsulate_key

Press a key or chord in a desktop capsule, e.g. ['ctrl','c'].

capsulate_snapshot

Capture a snapshot of a capsule's current state (restorable later).

capsulate_catalog

List the operating systems / base templates and marketplace bundles you can launch.

// known CVEs in dependencies3 high

Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.

high@modelcontextprotocol/sdk@1.18.0GHSA-345p-7cg4-v4c7

@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse

high@modelcontextprotocol/sdk@1.18.0GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@1.18.0GHSA-w48q-cv73-mx4w

Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default

Depend on this server? Get alerted when its CVEs change.Watch this server free →
// environment variables
To run this server yourself, you supply these values. They go in your own MCP client configuration and stay on your machine. The secret label means the value is sensitive, not that the server mishandles it.
🔐 secretCAPSULATE_API_KEY
configCAPSULATE_BASE_URL
configCAPSULATE_TEAM_ID
// quality suggestions

Tool annotations

No tools have read-only/destructive annotations

Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.

All four hints declared on every tool

15/15 tools missing one or more hints — capsulate_launch (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); capsulate_list (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); capsulate_get (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +12 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.

For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.

Tests exist

No test files found

Add tests that exercise each declared tool.

Production dependencies are patched

0 critical, 3 high severity in production deps — @modelcontextprotocol/sdk@1.18.0 (high), @modelcontextprotocol/sdk@1.18.0 (high)

Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.

Claim the listing to review these findings one by one and send us a correction where you disagree, straight to the team. Claiming also means we tell you when the grade moves, and reach you first if we find anything urgent.

// full audit trail
The findings above are the summary. The full trail, every check we ran, each deduction, the network hosts observed and the dependency advisories, goes to verified publishers, along with an alert whenever a new one lands. Verified publishers can also review each finding and dispute it in one click. Publisher corrections have sharpened several of our checks this month, because the maintainer knows the codebase better than any scanner.
// improvement guidance — verified publishers only
We have 4 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
// embed badge in your README
[![M8ven Verified](https://m8ven.ai/badge/mcp/capsulatedev/capsulate?variant=verified)](https://m8ven.ai/mcp/capsulatedev/capsulate)
Shows verification status without the grade. Want the grade badge instead? Remove ?variant=verified from the URL.
commit: 25d9f9c4fadbfd0f8c38274ae4b86ad25c283c2b
code hash: bc5ad221d97ca07ccfc440e7cf6d1b16033ba1e9fad8e150e0f0247976f38d50
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