mcp-registry/com.mcpcalc/calculator · v1.0.0
As of 2026-10-17 19:48 UTC, the Mcpcalc Calculator MCP server is up with a Glimind reliability score of 92/100 (grade A). Over the last 30 days it answered 100% of Glimind's liveness checks.
Calculators accessible via MCP with real-time collaborative sessions and shareable URLs.
Claude Code
claude mcp add --transport http mcpcalc-calculator-mcp-server https://mcpcalc.com/api/v1/mcp
Claude Desktop · Windsurf · Cline (mcpServers JSON)
{
"mcpServers": {
"mcpcalc-calculator-mcp-server": {
"type": "http",
"url": "https://mcpcalc.com/api/v1/mcp"
}
}
}
Third-party server, listed as discovered. Review its source before installing.
1 tool definition(s) exceed ~1,200 tokens each (largest: push_session_action, ~1,460).
Move long reference material out of descriptions (link a doc or expose a resource), drop repeated examples, and collapse large enums. Trimming these to ~600 tokens saves ~860 tokens every session.
10 of 10 tool(s) carry no readOnlyHint/destructiveHint annotations.
Annotate read-only tools with {"readOnlyHint": true}. Agents and gateways can then run them without a confirmation prompt, and route around destructive ones.
2 tool(s) look like they change state (create/send/delete/pay…) but declare no destructiveHint.
Set annotations {"readOnlyHint": false, "destructiveHint": true|false, "idempotentHint": …}. Clients use these to ask the user before a side effect and to auto-approve safe reads.
Negotiates MCP 2025-03-26. Structured output, tool output schemas and elicitation arrived in 2025-06-18.
Upgrade the MCP SDK and negotiate 2025-06-18 or newer.
Handshake + tools/list takes ~3,047 ms.
Serve tools/list from memory, keep the process warm, and host close to your users. Every new agent session pays this before its first call.
No tool declares an outputSchema.
Declare outputSchema and return structuredContent (MCP 2025-06-18+). Agents can then parse results without guessing, and chain tools reliably.
Paste-ready definitions with the problems above fixed. Changes marked verify need a human look. All of them as JSON: /v1/readiness/mcp-registry%2Fcom.mcpcalc%2Fcalculator/fixes
{
"name": "calculate",
"description": "Run a calculation and get results + prefilled URL",
"inputSchema": {
"type": "object",
"required": [
"calculator",
"inputs"
],
"properties": {
"inputs": {
"type": "object",
"description": "Calculator input values"
},
"strict": {
"type": "boolean",
"description": "If true, reject invalid or unknown input fields instead of dropping them"
},
"calculator": {
"type": "string",
"description": "Calculator slug"
}
}
},
"annotations": {
"readOnlyHint": true
}
}{
"name": "calculate_cas",
"description": "Evaluate one or more headless CAS expressions server-side (MCP-only numeric mode). Unsupported expressions return a GUI handoff link.",
"inputSchema": {
"type": "object",
"properties": {
"strict": {
"type": "boolean",
"description": "If true, reject unknown fields and malformed expressions instead of dropping them"
},
"expression": {
"type": "string",
"description": "Single CAS expression to evaluate"
},
"expressions": {
"type": "array",
"items": {
"type": "string"
},
"description": "Optional ordered list of CAS expressions to evaluate in one isolated context (supports assignments across the batch)"
}
}
},
"annotations": {
"readOnlyHint": true
}
}{
"name": "calculate_cas_headless",
"description": "Alias of calculate_cas. Headless MCP-only CAS evaluator; if unsupported features are requested, returns GUI handoff details.",
"inputSchema": {
"type": "object",
"properties": {
"strict": {
"type": "boolean",
"description": "If true, reject unknown fields and malformed expressions instead of dropping them"
},
"expression": {
"type": "string",
"description": "Single CAS expression to evaluate"
},
"expressions": {
"type": "array",
"items": {
"type": "string"
},
"description": "Optional ordered list of CAS expressions to evaluate in one isolated context (supports assignments across the batch)"
}
}
},
"annotations": {
"readOnlyHint": true
}
}Get an email or webhook when this server's readiness drops by 10+ points, tool-poisoning text appears, or a tool breaks:
curl -X POST https://glimind.com/v1/subscriptions -H 'content-type: application/json' -d '{"tools":["mcp-registry/com.mcpcalc/calculator"],"email":"[email protected]"}'Agents: watch_tool({"toolId": "mcp-registry/com.mcpcalc/calculator"}) over MCP.
push_session_action ~1,460 tokenscalculate_cas ~172 tokenscalculate_cas_headless ~172 tokensgenerate_prefilled_url ~119 tokenscalculate ~116 tokensStatic checks of the advertised tools/list (schema, descriptions, annotations, tool-poisoning patterns, names, size) plus observed protocol, uptime, latency and contract changes. Read-only: no tool is ever called. Weights: schema 15, docs 20, safety 15, efficiency 15, compatibility 15, protocol 5, reliability 10, stability 5. Token counts are estimates (~3.6 characters per token).
Operator? Fix these, then re-check live. Embed the readiness badge:
[](https://glimind.com/server/mcp-registry%2Fcom.mcpcalc%2Fcalculator?ref=badge)
<a href="https://glimind.com/server/mcp-registry%2Fcom.mcpcalc%2Fcalculator?ref=badge"><img src="https://glimind.com/v1/readiness/badge/mcp-registry%2Fcom.mcpcalc%2Fcalculator.svg" alt="MCP agent-readiness"></a>
.. image:: https://glimind.com/v1/readiness/badge/mcp-registry%2Fcom.mcpcalc%2Fcalculator.svg :target: https://glimind.com/server/mcp-registry%2Fcom.mcpcalc%2Fcalculator?ref=badge :alt: MCP agent-readiness
Glimind records every version of this server's tool definitions in a signed, append-only transparency log. Current manifest sha256:c9f5ef30ce3a7857…, first seen 2026-10-17, included at leaf 13284 of 18,318. Version history · verify what your client received.
Compare: most reliable other servers · most reliable code servers · most reliable productivity servers
Glimind tells agents whether a server is up right now and how to call it, then fails over to a live alternative when it isn't.
Claude Code
claude mcp add --transport http glimind https://glimind.com/mcp
Claude Desktop · Windsurf · Cline (mcpServers JSON)
{
"mcpServers": {
"glimind": {
"type": "http",
"url": "https://glimind.com/mcp"
}
}
}
As of 2026-10-17 19:48 UTC, the Mcpcalc Calculator MCP server is up with a Glimind reliability score of 92/100 (grade A). Over the last 30 days it answered 100% of Glimind's liveness checks.
Mcpcalc Calculator MCP server advertises 10 tools, including calculate, calculate_cas, calculate_cas_headless, close_session, create_session.
Point your MCP client at this streamable-http endpoint: https://mcpcalc.com/api/v1/mcp
Glimind scanned all 10 tool definitions for tool-poisoning patterns — hidden or invisible characters, instructions that override the model, concealment from the user, requests to read credential or MCP config files, conversation exfiltration and cross-tool shadowing — and found none. This checks what the server tells the model, not what its code does; review the source before granting access to sensitive data.
Status page: 90-day uptime, every outage and how long it lasted.
Claim this listing to get the Verified operator marker, a remediation checklist and owner analytics, or embed the live badge from any of the tool pages above. Maintainers: alerts, deploy attestation and monthly reports.
Status is an automated estimate from Glimind's liveness checks (handshake and tool listing only; no tool is ever called) and may lag or differ from your network. Glimind is not affiliated with this server or its operator. Operator? Request a correction or opt out at https://glimind.com/opt-out.