outlook-mcp (ryaker/outlook-mcp) is an MCP server listed on the M8ven Trust Index. It scores 89 out of 100, grade B. It declares 34 tools. No publisher has claimed this listing.

Back to MCP Trust IndexM8ven
B
Emerging
89/100
1 month ago

outlook-mcp

MCP server for Claude to access Outlook data via Microsoft Graph API

→ ryaker/outlook-mcp· listed on mcp_so

Emerging. No concerning findings. Grades remain capped until the project builds reputation through adoption. 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

ryaker

Source: mcp.so · also listed on Glama, github_topic

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Install from

mcp.sonot scored hereGlamanot 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
🚨
Secret credentials may flow to a network call
3 flows detected: MS_CLIENT_SECRET. We can’t prove the destination matches the brand the credential belongs to.
🚨
Known vulnerabilities in dependencies: 1 critical, 1 high
Affects packages this MCP installs at runtime. Upgrade or remove the affected dependency.
🔐
You'll be asked for 2 credentials: MS_CLIENT_SECRET, OUTLOOK_CLIENT_SECRET
These are read from process.env at runtime. Make sure you trust where they’ll be sent.
// known CVEs in dependencies1 critical1 high

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

critical@modelcontextprotocol/inspector@0.10.2GHSA-7f8r-222p-6f5g

MCP Inspector proxy server lacks authentication between the Inspector client and proxy

high@modelcontextprotocol/inspector@0.10.2GHSA-g9hg-qhmf-q45m

MCP Inspector is Vulnerable to Potential Command Execution via XSS When Connecting to an Untrusted MCP Server

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.
configMS_AUTHORITY_HOST
configMS_CLIENT_IDyour-application-client-id-here
🔐 secretMS_CLIENT_SECRETyour-client-secret-VALUE-here
configMS_REDIRECT_URI
configMS_SCOPES
configMS_TENANT_IDyour-tenant-id-here
configMS_TOKEN_ENDPOINT
configOUTLOOK_CLIENT_IDFor Claude Desktop config, you'll use and OUTLOOK_CLIENT_SECRET
🔐 secretOUTLOOK_CLIENT_SECRETFor Claude Desktop config, you'll use OUTLOOK_CLIENT_ID and
configUSE_TEST_MODE"": "false",
// 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

34/34 tools missing one or more hints — list-events (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); decline-event (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); create-event (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +31 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.).

Tool test coverage

Only 1/34 tools referenced in tests (3%)

Write tests that reference each tool by name so every tool has at least one test.

Shell command execution

2 child_process calls — runs shell commands

Prefer library functions over shell-outs. If you must shell out, ensure all inputs are properly escaped.

Secrets not logged

4 secret values sent to console.log

Redact or omit secret values from log output.

Dev dependencies

2 critical/high in dev-only deps (does not ship to users)

Upgrade dev dependencies when convenient.

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 7 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 Score](https://m8ven.ai/badge/mcp/ryaker/outlook-mcp)](https://m8ven.ai/mcp/ryaker/outlook-mcp)
Shows your grade and updates automatically. Prefer no grade? Append ?variant=verified to the badge URL.
commit: 95d6ff2d248903c086f17782c2de28e16016e6aa
code hash: 8c438d91ba646b8385358473c4afe864809d615457b56269f1349cb7f0ff25c0
verified: 8/7/2026, 4:42:05 AM
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