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io.github.cyanheads/calculator-mcp-server

REMOTE · CALCULATOR.CASEYJHAND.COM · 2 COMPONENTS · SCANNED SEP 22

Evaluate, simplify, and differentiate mathematical expressions.

Available components

remote · calculator.caseyjhand.com 81 npm · @cyanheads/calculator-mcp-server 81
0 this week 81 Trust /100
Trust breakdown (7 categories)

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →

Endpoint Security66
  • The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
  • Authorisation not fully verified: no authorisation is required to call this server, and 1 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. See how to fix → View diagnostics → Unverified
  • HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
  • The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
  • DNSSEC is configured correctly; the domain's records validate against the full chain to the root. View diagnostics → Pass
Transport & Reachability100
Schema Quality & AI Usability70
  • 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
  • AI-judged instruction clarity (good).Pass
  • Context-footprint check failed: tool/resource definitions use about 798 tokens (~399/item across 2 items; 1 tools + 1 resources), over budget; trim descriptions and params. See how to fix → Fail
  • Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
  • No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
  • 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
  • 100% of tool parameters carry a description.Pass
  • Structured output schemas are declared (100% of tools); any adoption earns full credit.Pass
Tool Safety100
  • No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
  • We read all 1 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
  • An AI judge read all 3 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
  • Implements a current MCP spec version (2026-07-28).Pass
Install

How do I install the io.github.cyanheads/calculator-mcp-server server?

io.github.cyanheads/calculator-mcp-server is a hosted endpoint at https://calculator.caseyjhand.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

remote · calculator.caseyjhand.com

# add to Claude Code
claude mcp add --transport http cyanheads-calculator-mcp-server 'https://calculator.caseyjhand.com/mcp'
// .cursor/mcp.json
{
  "mcpServers": {
    "cyanheads-calculator-mcp-server": {
      "url": "https://calculator.caseyjhand.com/mcp"
    }
  }
}
// .vscode/mcp.json
{
  "servers": {
    "cyanheads-calculator-mcp-server": {
      "type": "http",
      "url": "https://calculator.caseyjhand.com/mcp"
    }
  }
}
# ~/.codex/config.toml
[mcp_servers.cyanheads-calculator-mcp-server]
url = "https://calculator.caseyjhand.com/mcp"
// opencode.json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "cyanheads-calculator-mcp-server": {
      "type": "remote",
      "url": "https://calculator.caseyjhand.com/mcp",
      "enabled": true
    }
  }
}
# add to OpenClaw
openclaw mcp add cyanheads-calculator-mcp-server --url 'https://calculator.caseyjhand.com/mcp' --transport streamable-http
# ~/.hermes/config.yaml
mcp_servers:
  cyanheads-calculator-mcp-server:
    url: "https://calculator.caseyjhand.com/mcp"
// ~/.netclaw/config/netclaw.json
{
  "McpServers": {
    "cyanheads-calculator-mcp-server": {
      "Transport": "http",
      "Url": "https://calculator.caseyjhand.com/mcp"
    }
  }
}
# add to Vellum
assistant mcp add cyanheads-calculator-mcp-server -t streamable-http -u 'https://calculator.caseyjhand.com/mcp'
// mcp.json
{
  "mcpServers": {
    "cyanheads-calculator-mcp-server": {
      "type": "http",
      "url": "https://calculator.caseyjhand.com/mcp"
    }
  }
}

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

Changelog

Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.

  • 19 Sept 26 0
    • Server version: 0.4.2 → 0.4.3 functional
  • 13 Sept 26 0
    • Server version: 0.4.1 → 0.4.2 functional
  • 9 Sept 26 0
    • Stability: 0.97 → pass security
  • 8 Sept 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.

  • 7 Sept 26 −1
    • Stability: pass → 0.93 functional
  • 26 Aug 26 +1
    • We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
  • 25 Aug 26 0
    • Stability: 0.97 → pass security
  • 22 Aug 26 0
    • MCP protocol: Implements a current MCP spec version (2026-07-28). functional
    • MCP protocol version: 2025-11-25 → 2026-07-28 functional
    • Server version: 0.4.0 → 0.4.1 functional
Diagnostics

Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.

Captured 22 Sept 2026 · Probed https://calculator.caseyjhand.com/mcp

TLS valid

Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .

Subject Issuer Valid from Valid until Key Signature Serial
CN=caseyjhand.com CN=WE1,O=Google Trust Services,C=US 4 Sept 2026 3 Dec 2026 ECDSA 256 ECDSA-SHA256 a6985204ed51ae050e7738aa6be668e9
SANs: caseyjhand.com, *.caseyjhand.com
CN=WE1,O=Google Trust Services,C=US (CA) CN=GTS Root R4,O=Google Trust Services LLC,C=US 13 Dec 2023 20 Feb 2029 ECDSA 256 ECDSA-SHA384 7ff31977972c224a76155d13b6d685e3
CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE 15 Nov 2023 28 Jan 2028 ECDSA 384 SHA256-RSA 7fe530bf331343bedd821610493d8a1b

Background: What to check on a remote MCP endpoint →

DNSSEC secure

Validation of calculator.caseyjhand.com. — Secure

Zone DS Keys Algorithms Outcome
. trust_anchor 20326, 38696 8, 8 Verified
com. present 19718 13 Verified
caseyjhand.com. present 2371 13 Verified
calculator.caseyjhand.com. Verified address RRset verified with the apex keys
Authentication No authorisation required

The endpoint answered without asking for a token. Anyone who knows the URL can reach it.

Result No authorisation required
HTTP status 200
Header Value
strict-transport-security max-age=63072000; includeSubDomains; preload
x-content-type-options nosniff

Background: How OAuth 2.1 works in the 2026 MCP spec →

Transports 2 probes
Transport URL Outcome Status Location
streamable-http https://calculator.caseyjhand.com/mcp Verified 200
http (plaintext) http://calculator.caseyjhand.com/mcp HTTPS enforced 301 https://calculator.caseyjhand.com/mcp
MCP tools · 1 exposed · ~659 tokens

The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →

Tool Tokens
calculate ~659

Evaluate math expressions, simplify algebraic expressions, or compute symbolic derivatives. One expression per call. Supports arithmetic, trigonometry, statistics, matrices, complex numbers, units, and combinatorics.

NameTypeReqDescription
expressionstringyesOne mathematical expression per call — neither `;` nor newlines separate statements. Inside matrices, `;` separates rows (e.g. `[1, 2; 3, 4]`). Supports arithmetic (+, -, *, /, ^, %), functions acros…
numericTypestring–Numeric type for evaluate. "number" (default): 64-bit IEEE 754 float — fastest, standard precision. "BigNumber": arbitrary-precision decimal — use when intermediate values overflow 64-bit float (e.g.…
operationstring–Operation to perform. "evaluate" computes a numeric result (default). "simplify" reduces an algebraic expression symbolically (e.g., "2x + 3x" -> "5 * x"). Supports algebraic and trigonometric identi…
precision––Significant digits (1–16) for numeric results. Omit for full precision. Empty string is treated as omitted. Ignored for symbolic operations (simplify, derivative).
scopeobject–Variable assignments for the expression. Example: { "x": 5, "y": 3 } makes "x + y" evaluate to 8.
variable––Variable to differentiate with respect to. Required when operation is "derivative". Empty string is treated as omitted. Example: "x".
NameTypeReqDescription
errorobject–Present when the call failed. Absent on success.
expressionstring–The original expression as received.
operationstring–The operation that was applied.
precisionUsednumber–Significant-digit precision applied to the result. Omitted when full precision was used or the operation is symbolic.
resultstring–The computed result as a string.
resultTypestring–Type of result as reported by math.js: number, BigNumber, Complex, DenseMatrix, Unit, string, boolean. Symbolic operations return "string".
scopeVarsarray–Keys from the scope that were active during evaluation. Omitted when no scope was provided. Values are omitted to keep output compact.
unchangedboolean–Present only for simplify operations. true means the simplifier returned the expression unchanged — it could not reduce it further (e.g. rational expressions requiring polynomial factoring are beyond…

No examples provided.

Common questions

What is the io.github.cyanheads/calculator-mcp-server server?

io.github.cyanheads/calculator-mcp-server is listed in the public MCP registry as io.github.cyanheads/calculator-mcp-server. Evaluate, simplify, and differentiate mathematical expressions. This page covers its hosted endpoint (https://calculator.caseyjhand.com/mcp).

Is the io.github.cyanheads/calculator-mcp-server server safe to use?

io.github.cyanheads/calculator-mcp-server scores 81 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

What tools does the io.github.cyanheads/calculator-mcp-server server expose?

io.github.cyanheads/calculator-mcp-server exposes 1 tool: calculate. Their descriptions and schemas cost roughly 659 tokens of context every time the server is loaded.

Does the io.github.cyanheads/calculator-mcp-server server require authentication?

No. We connected to io.github.cyanheads/calculator-mcp-server without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

Is the io.github.cyanheads/calculator-mcp-server server still maintained?

io.github.cyanheads/calculator-mcp-server is still listed as active in the MCP registry. We last reached this channel on 22 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.