better-call-claude (sns45/better-call-claude) is an MCP server listed on the M8ven Trust Index. It scores 52 out of 100, grade D. It declares 10 tools. No publisher has claimed this listing.

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D
Caution
52/100

better-call-claude

Bi-directional communication for Claude Code via Voice Calls, SMS, and WhatsApp, allowing users to call Claude, receive callbacks, and interact through multiple channels.

→ sns45/better-call-claude· 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

sns45

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: 6 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 3 credentials: BETTERCALLCLAUDE_OPENAI_API_KEY, BETTERCALLCLAUDE_PHONE_AUTH_TOKEN, BETTERCALLCLAUDE_TELNYX_PUBLIC_KEY
These are read from process.env at runtime. Make sure you trust where they’ll be sent.
// tools this server exposes10 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.

receive_inbound_call

Check for and receive an incoming phone call from the user. Returns the user's spoken message if a call is waiting.

initiate_call

Start a phone call to the user to communicate status, ask questions, or request decisions. The call will connect and Claude can speak first.

continue_call

Continue an active phone call by speaking a message and waiting for the user's response.

speak_to_user

Speak to the user on an active call without waiting for a response. Good for acknowledgments or updates.

end_call

End an active phone call, optionally with a closing message.

receive_inbound_message

Check for incoming SMS or WhatsApp messages from the user. Returns the message content if one is waiting.

send_sms

Send an SMS message to the user. Can optionally wait for a reply.

send_whatsapp

Send a WhatsApp message to the user. Can optionally wait for a reply.

reply_to_conversation

Reply to an existing conversation (voice call, SMS, or WhatsApp). Continues the conversation thread.

get_conversation_history

Get the full message history for a conversation, including all messages exchanged.

// known CVEs in dependencies6 high24 low

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

high@modelcontextprotocol/sdk@1.0.0GHSA-w48q-cv73-mx4w

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

highhono@4.6.0GHSA-3vhc-576x-3qv4

Hono JWK Auth Middleware has JWT algorithm confusion when JWK lacks "alg" (untrusted header.alg fallback)

highhono@4.6.0GHSA-88fw-hqm2-52qc

hono: CORS Middleware reflects any Origin with credentials when `origin` defaults to the wildcard

highhono@4.6.0GHSA-f67f-6cw9-8mq4

Hono JWT Middleware's JWT Algorithm Confusion via Unsafe Default (HS256) Allows Token Forgery and Auth Bypass

highhono@4.6.0GHSA-m732-5p4w-x69g

Hono Improper Authorization 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.
configBETTERCALLCLAUDE_BAILEYS_AUTH_DIRdata/baileys-auth Session credential directory
🔐 secretBETTERCALLCLAUDE_OPENAI_API_KEY"": "sk-..."
configBETTERCALLCLAUDE_PHONE_ACCOUNT_SID"": "your-account-sid",
🔐 secretBETTERCALLCLAUDE_PHONE_AUTH_TOKEN"": "your-auth-token",
configBETTERCALLCLAUDE_PHONE_NUMBER"": "+15551234567",
configBETTERCALLCLAUDE_PHONE_PROVIDER"": "twilio",
configBETTERCALLCLAUDE_PORT3333 Local HTTP server port
configBETTERCALLCLAUDE_STT_SILENCE_DURATION_MS800 End-of-speech detection
🔐 secretBETTERCALLCLAUDE_TELNYX_PUBLIC_KEY
configBETTERCALLCLAUDE_TELNYX_VOICE
configBETTERCALLCLAUDE_TRANSCRIPT_TIMEOUT_MS180000 Speech timeout (3 min)
configBETTERCALLCLAUDE_TTS_VOICEonyx OpenAI voice (alloy, echo, fable, onyx, nova, shimmer)
configBETTERCALLCLAUDE_USER_PHONE_NUMBER"": "+1234567890"
configBETTERCALLCLAUDE_VERIFY_WEBHOOKS
configBETTERCALLCLAUDE_WHATSAPP_CHAT_HISTORY_SIZE
configBETTERCALLCLAUDE_WHATSAPP_NUMBERWhatsApp number if different (e.g., Twilio Sandbox)
configBETTERCALLCLAUDE_WHATSAPP_PROVIDER"": "baileys",
configBUN_TEST
configTAILSCALE_HOSTNAMEauto-detected Override Tailscale hostname
// 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

10/10 tools missing one or more hints — receive_inbound_call (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); initiate_call (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); continue_call (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +7 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 test coverage

5/10 tools referenced in tests (50%)

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

Production dependencies are patched

0 critical, 6 high severity in production deps — @modelcontextprotocol/sdk@1.0.0 (high), hono@4.6.0 (high)

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

Dependency freshness

1/8 production deps stale: qrcode-terminal@2022-06-25 (4.1y)

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: ad20ba45e39e84b39ade2262f49266a03a02680e
code hash: b29aca3d3c54f999d4df777b4ce452b96d169d3f6aaa46f07806575952b7a6e5
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