gcalendar-mcp (sandeepmallareddy/gcalendar-mcp) is an MCP server listed on the M8ven Trust Index. It scores 60 out of 100, grade C. It declares 22 tools. No publisher has claimed this listing.

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C
Caution
60/100

gcalendar-mcp

A Model Context Protocol server that enables Claude to fully manage Google Calendar, including events, calendars, sharing, and availability checks through natural language.

→ sandeepmallareddy/gcalendar-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

sandeepmallareddy

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.
✅
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: GOOGLE_CLIENT_SECRET
These are read from process.env at runtime. Make sure you trust where they’ll be sent.
// tools this server exposes22 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.

list_events

List events on a calendar. Supports filtering by time range and search queries.

get_event

Get a single event by ID.

create_event

Create a new event.

update_event

Update an event.

delete_event

Delete an event.

quick_add

Create event from natural language.

list_instances

Get instances of a recurring event.

list_calendars

List all accessible calendars.

get_calendar

Get calendar metadata.

create_calendar

Create a new calendar.

delete_calendar

Delete a calendar.

clear_calendar

Delete all events from a calendar.

list_acl

List access control rules.

get_acl_rule

Get an ACL rule.

create_acl_rule

Share a calendar with someone.

delete_acl_rule

Remove calendar sharing.

query_freebusy

Query free/busy information.

get_colors

Get available colors.

auth_status

Check authentication status and get auth URL if needed.

reauth

Delete stored tokens and generate new auth URL for re-authentication.

revoke_auth

Revoke tokens with Google and delete local tokens, then get new auth URL.

handle_oauth_callback

Complete OAuth with authorization code.

// known CVEs in dependencies3 high1 low

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

high@modelcontextprotocol/sdk@1.10.0GHSA-345p-7cg4-v4c7

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

high@modelcontextprotocol/sdk@1.10.0GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@1.10.0GHSA-w48q-cv73-mx4w

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

lowzod@3.22.0GHSA-m95q-7qp3-xv42

Zod denial of service vulnerability

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.
configGCALENDAR_MCP_TOKEN_PATH
configGOOGLE_CLIENT_IDYOUR_CLIENT_ID.apps.googleusercontent.com
🔐 secretGOOGLE_CLIENT_SECRETYOUR_CLIENT_SECRET
configGOOGLE_REDIRECT_URIenv ="http://localhost:3000/oauth2callback" \
// 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

22/22 tools missing one or more hints — list_events (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_event (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); create_event (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +19 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.

Secrets not written to files

1 secret value written to files

Avoid persisting secrets to disk. Keep them in memory or your secret manager.

Production dependencies are patched

0 critical, 3 high severity in production deps — @modelcontextprotocol/sdk@1.10.0 (high), @modelcontextprotocol/sdk@1.10.0 (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
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commit: f1e374cd69f9406f9af1393d6ee6ea6d4e9ebed6
code hash: 22da9adc3996ae22fcca85f66ed6bf8d87e162381fe1936101a4f2517f606f8a
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