A2A MCP Server (ww2521/a2a-mcp-adaptor) is an MCP server listed on the M8ven Trust Index. It scores 60 out of 100, grade C. It declares 6 tools. No publisher has claimed this listing.

Back to MCP Trust IndexM8ven
C
Caution
60/100

A2A MCP Server

Exposes A2A (Agent-to-Agent) protocol as MCP tools, enabling Goose to call remote A2A agents via External Subagent mechanism.

→ ww2521/a2a-mcp-adaptor· listed on glama

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.

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Who stands behind it

ww2521

Source: Glama

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Install from

Glamanot scored here

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.
🔐
You'll be asked for 1 credential: A2A_API_KEY
These are read from process.env at runtime. Make sure you trust where they’ll be sent.
// tools this server exposes6 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.

a2a_discover

Discover an A2A agent at a URL. Fetches the agent card and registers it for later use.

a2a_list_agents

List all discovered A2A agents with their capabilities and skills.

a2a_send

Send a message to an A2A agent and wait for the result. Supports polling for async tasks.

a2a_get_task

Get the current status and result of a task by ID.

a2a_cancel_task

Cancel a running task.

a2a_list_tasks

List tasks on a remote agent, optionally filtered by context.

// 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@1.12.1GHSA-345p-7cg4-v4c7

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

high@modelcontextprotocol/sdk@1.12.1GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@1.12.1GHSA-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.
🔐 secretA2A_API_KEY认证 API Key 空
configA2A_GATEWAY_URLA2A Gateway URL (如 LiteLLM) http://localhost:4000
configA2A_TIMEOUTHTTP 请求超时 (毫秒) 30000
// 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

6/6 tools missing one or more hints — a2a_discover (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); a2a_list_agents (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); a2a_send (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +3 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.

License file

No license file

Add a LICENSE file (MIT, Apache-2.0, etc.).

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@1.12.1 (high), @modelcontextprotocol/sdk@1.12.1 (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 5 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
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commit: 7da3a1ea1e6ad2f6aed7c0a60f95a6598264cb22
code hash: 6e0de28e8f063aa83d39f5f5548d1a511860915eda62af469462427058e812d1
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