MCP QUEEN
engineer.calc/calc A
88 free engineering calculators: RF link budgets, LoRa/Meshtastic, PCB, solar, homelab. Keyless.
Otherv1.0.0streamable-httpcalc.engineer
Grade evidence — probed 2026-07-18 11:15 UTC
| Criterion | Points | Observed |
|---|---|---|
| reachability | 25 / 25 | HTTP 200, initialize accepted in 1313ms |
| protocol | 15 / 15 | valid JSON-RPC initialize result, protocolVersion 2025-06-18, serverInfo calc-engineer@1.0.0 |
| tooling | 35 / 35 | tools/list OK: 89 tools e.g. "fspl"; 89/89 described, 89/89 fully-typed schemas, median description 517 chars |
| latency | 7 / 10 | initialize round-trip 1313ms |
| provenance | 12 / 15 | description present; no repository URL; version 1.0.0; namespace engineer.calc matches endpoint/repo |
Score 94/100 · latency 1313ms · 89 tools · protocol access: open ⓘ
Trust receipt
Security, data integrity, citation quality, and advertised claims are measured separately from protocol uptime. Missing evidence is marked unverified, never converted into a pass.
| Dimension | Metric | Status | Evidence | Source |
|---|---|---|---|---|
| citation_quality | citation_capability_advertised | unverified | Metadata/tool descriptions advertise citation or evidence capability: References IPC-2141 | four (Fourier/THD), and a built-in parts library (reference 2n3904/2n2222/1n4148/1n5819/2n7000/tl072/lm358/le lora_airtime Calculates LoRa packet time-on-air using the Semtech AN1200 | Returns sensitivity in dBm, noise floor, required SNR, and thermal noise reference. No response-level citation benchmark has verified this claim yet. | live_probe |
| security | authentication_boundary | observed | Live protocol probe observed auth_state=open. This describes discovery/access behavior; it is not by itself a vulnerability finding. Observed value: open | live_probe |
Machine-readable receipt: /api/trust/engineer.calc/calc.json
Connect your agent
Claude Code:
claude mcp add --transport http calc https://calc.engineer/mcp
Generic MCP client config:
{ "mcpServers": { "calc": { "type": "http", "url": "https://calc.engineer/mcp" } } }
MCP Queen is a graded index, not a middleman — your agent connects directly to the server above. Check the grade and evidence first; that's the point.
Share this server: permalink https://mcpqueen.com/s/engineer.calc/calc · referral link https://mcpqueen.com/go/engineer.calc/calc (counts as “routed via the queen”).
Own this server? Embed your grade badge
Live operational-grade badge, re-probed continuously — not a security or data-quality certification. Put it in your README and link to the complete receipt:
[](https://mcpqueen.com/s/engineer.calc/calc)
Think the grade is wrong? Fix the finding the evidence shows, then the next probe cycle picks it up automatically (full cycle ≈ 3 days) — or open a dispute via the MCP endpoint.
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Probe history
| When (UTC) | Grade | Score | Latency |
|---|---|---|---|
| 2026-07-18 11:15 | A | 94 | 1313ms |