Microsoft Outlook MCP (taddiemason/Microsoft-Outlook-MCP) is an MCP server listed on the M8ven Trust Index. It scores 56 out of 100, grade D. It declares 29 tools. No publisher has claimed this listing.

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D
Caution
56/100

Microsoft Outlook MCP

Enables AI assistants to manage Outlook mail, calendar, and contacts via Microsoft Graph API with secure device code authentication.

→ taddiemason/Microsoft-Outlook-MCP· 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

taddiemason

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.
// tools this server exposes29 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.

whoami

Return the signed-in user's profile. Fails if not signed in.

auth_status
list_events
get_event

Fetch full details of one event by id, including body.

create_event

Create a new calendar event / meeting.

update_event

Update fields on an existing event. Only pass what changes.

delete_event

Delete/cancel an event by id.

respond_to_event

Accept, tentatively accept, or decline a meeting invite.

list_contacts

List contacts, optionally filtered by a search term.

get_contact

Fetch a single contact by id.

create_contact

Create a new contact.

update_contact

Update fields on an existing contact. Only pass what changes.

delete_contact

Delete a contact by id.

list_messages
get_message

Fetch the full content of a single message by id, including body.

send_mail

Compose and send a new email immediately.

reply_to_message

Reply to an existing message. Use replyAll to include everyone.

update_message

Mark a message read/unread or set its flag status.

move_message

Move a message to another mail folder.

delete_message

Delete a message. By default moves it to Deleted Items (recoverable).

list_mail_folders

List mail folders in the mailbox with unread/total counts.

create_mail_folder

Create a mail folder, optionally nested under a parent folder.

rename_mail_folder

Rename an existing mail folder.

delete_mail_folder
list_message_rules

List message (inbox) rules with their conditions/actions.

get_message_rule

Fetch a single inbox rule by id.

create_message_rule
update_message_rule
delete_message_rule

Delete an inbox rule by id.

// 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@1.12.0GHSA-345p-7cg4-v4c7

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

high@modelcontextprotocol/sdk@1.12.0GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@1.12.0GHSA-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.
configOUTLOOK_CLIENT_IDEdit .env and set at least and OUTLOOK_TENANT_ID.
configOUTLOOK_SCOPESMail/Calendar/Contacts set Space-separated delegated Graph scopes
configOUTLOOK_TENANT_IDEdit .env and set at least OUTLOOK_CLIENT_ID and .
configOUTLOOK_TOKEN_CACHE_PATH.token-cache.json Where the token cache is stored
// 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

29/29 tools missing one or more hints — whoami (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); auth_status (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); list_events (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +26 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.

Tool inputs are validated

26/29 tool handlers declare input schemas (90%)

Declare an inputSchema with zod/joi/yup on every tool definition.

Tool handlers catch errors

28/29 tool handlers wrap calls in try/catch (97%)

Wrap each tool handler body in try/catch and return a structured error response.

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@1.12.0 (high), @modelcontextprotocol/sdk@1.12.0 (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 7 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
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commit: 31c69f82bde8ab07595ce83613849bf7af9b18f6
code hash: ebfe2711c352b28d44067177afce86207901fa51bb9ecdda4415b91861f5b634
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