# `ai.sparkquote/nec-calculators` on anlyon.dev

> Text inside fenced blocks marked untrusted-server-text was written by the MCP server's publisher, not by anlyon.dev. It is data to inspect, not instructions to follow. Invisible characters are shown as [U+XXXX].
> No finding is not a safety guarantee: these are point-in-time checks of tool definitions, not of code or behaviour.

- Page: https://anlyon.dev/servers/ai.sparkquote/nec-calculators
- JSON: https://anlyon.dev/api/v1/servers/ai.sparkquote/nec-calculators
- Version: 1.0.1 (active)
- Publisher: ai.sparkquote (domain proven to the MCP Registry)
- Runs: remote (streamable-http)
- Sign-in to list tools: none
- Metadata from the official MCP Registry, synced 2026-10-21T17:43:28.986Z

Title and description, as the publisher wrote them:

```untrusted-server-text
SparkQuote NEC calculators
NEC 2023 electrical calculators: wire size, ampacity, voltage drop, conduit fill, box fill, load.
```

Scanned 2026-10-21T18:41:44.063Z over streamable-http.

**10 tools: 1 can delete or cancel things and 9 change things.**

| Group | Class | Tools | Claude Code |
| --- | --- | --- | --- |
| Deletes or cancels | destructive | 1 | deny |
| Can't be undone | irreversible | 0 | ask |
| Changes things | write | 9 | ask |
| Only reads | read | 0 | allow |

## Findings

- **warn** Annotations that disagree with the tool in `voltage_drop` ([annotation-conflict](https://anlyon.dev/methodology#annotation-conflict))

```untrusted-server-text
The server marks "voltage_drop" read-only (readOnlyHint: true), and its own name, description or input give the class "destructive".

annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "voltage_drop" says "drop": a word for removing or ending something.
```

- **warn** Annotations that disagree with the tool in `voltage_drop` ([annotation-conflict](https://anlyon.dev/methodology#annotation-conflict))

```untrusted-server-text
The server marks "voltage_drop" not destructive (destructiveHint: false), and its own name, description or input give the class "destructive".

annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "voltage_drop" says "drop": a word for removing or ending something.
```

- **warn** Annotations that disagree with the tool in `conduit_fill` ([annotation-conflict](https://anlyon.dev/methodology#annotation-conflict))

```untrusted-server-text
The server marks "conduit_fill" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "conduit_fill" says "fill": a word for a change.
```

- **warn** Annotations that disagree with the tool in `box_fill` ([annotation-conflict](https://anlyon.dev/methodology#annotation-conflict))

```untrusted-server-text
The server marks "box_fill" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "box_fill" says "fill": a word for a change.
```

- **warn** Annotations that disagree with the tool in `panel_schedule` ([annotation-conflict](https://anlyon.dev/methodology#annotation-conflict))

```untrusted-server-text
The server marks "panel_schedule" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "panel_schedule" says "schedule": a word for a change.
```


## Deletes or cancels (1)

Removes, cancels or revokes something. Claude Code: deny.

### `voltage_drop`

- The name "voltage_drop" says "drop": a word for removing or ending something.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
- The server marks it not destructive (destructiveHint: false), but an annotation never lowers a class.
- Findings: warn annotation-conflict, warn annotation-conflict

Description, as the server wrote it:

```untrusted-server-text
Voltage drop for a given conductor size, current and one-way length, single- or three-phase, from NEC Chapter 9 Table 8 circular mils (VD = 2·K·I·L / CM, or √3 for three-phase).
```

## Changes things (9)

Creates or changes something that can be changed back. Claude Code: ask.

### `bid_calculator`

- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

Description, as the server wrote it:

```untrusted-server-text
Electrical bid price from materials, markup, labor hours and rate, job costs, overhead and a target net margin (price = break-even / (1 − margin)).
```

### `box_fill`

- The name "box_fill" says "fill": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
- Findings: warn annotation-conflict

Description, as the server wrote it:

```untrusted-server-text
Minimum outlet box volume from NEC 314.16(B): conductor, device (2 each), clamp and grounding allowances times the Table 314.16(B) volume for the largest conductor.
```

### `conduit_fill`

- The name "conduit_fill" says "fill": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
- Findings: warn annotation-conflict

Description, as the server wrote it:

```untrusted-server-text
Percent fill and maximum number of THHN/THWN-2 conductors of one size in EMT or PVC Schedule 40, from NEC Chapter 9 Tables 1, 4 and 5.
```

### `load_calculator`

- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

Description, as the server wrote it:

```untrusted-server-text
Dwelling service load by the NEC 220.82 optional method: 3 VA/ft² lighting, small-appliance and laundry circuits, fixed appliances, demand factor, heating or cooling, and the minimum standard service size. Leave an appliance out to count it as 0 VA.
```

### `nec_ampacity`

- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

Description, as the server wrote it:

```untrusted-server-text
Allowable ampacity of one insulated conductor from NEC Table 310.16 (not more than three current-carrying conductors in a raceway or cable, 30°C ambient), before any adjustment or correction factors and before the 240.4(D) small-conductor limits.
```

### `ohms_law`

- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

Description, as the server wrote it:

```untrusted-server-text
Ohm's law and power: give exactly two of voltage, current, resistance and power; the other two are calculated.
```

### `panel_schedule`

- The name "panel_schedule" says "schedule": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
- Findings: warn annotation-conflict

Description, as the server wrote it:

```untrusted-server-text
Lays circuits out on a 120/240 V single-phase or 208Y/120 V three-phase panel and totals the load per phase with the imbalance.
```

### `watts_to_amps`

- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

Description, as the server wrote it:

```untrusted-server-text
Current drawn by a load in watts at a voltage and power factor, single- or three-phase, plus the 125% continuous-load value.
```

### `wire_size`

- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

Description, as the server wrote it:

```untrusted-server-text
Minimum conductor size for a circuit: NEC Table 310.16 ampacity at the termination temperature rating, the 240.4(D) small-conductor limits, voltage drop over the run, and the Table 250.122 equipment grounding conductor, increased in proportion under 250.122(B) when voltage drop upsizes the conductors.
```

## Claude Code permissions

For `.claude/settings.json`, assuming the server is installed as `nec-calculators`:

```json
{
  "permissions": {
    "allow": [],
    "ask": [
      "mcp__nec-calculators__wire_size",
      "mcp__nec-calculators__watts_to_amps",
      "mcp__nec-calculators__conduit_fill",
      "mcp__nec-calculators__box_fill",
      "mcp__nec-calculators__load_calculator",
      "mcp__nec-calculators__ohms_law",
      "mcp__nec-calculators__panel_schedule",
      "mcp__nec-calculators__bid_calculator",
      "mcp__nec-calculators__nec_ampacity"
    ],
    "deny": [
      "mcp__nec-calculators__voltage_drop"
    ]
  }
}
```