# fp-conv (npm · fp-conv-mcp)

Encode, decode, and convert numbers across FP32, FP16, BF16, TF32, FP8/6/4, and integer formats.

- Trust score: 79/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- npm · `fp-conv-mcp`: 79/100 (this document), [markdown](https://verifymcp.io/servers/sw23-fp-conv-mcp/fp-conv-mcp.md), [page](https://verifymcp.io/servers/sw23-fp-conv-mcp/fp-conv-mcp)

## Channel facts

- Registry: `npm`
- Package: `fp-conv-mcp`
- Version: `1.5.1`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Supply Chain Security**: 98/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - 30 of 92 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 97/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to sw23/fp-conv).
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 4 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 67/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 930 tokens (~186/item across 5 items; 5 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: not enough scan history yet (needs a 30-day window).
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 5 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

**Unverified: 1 category.** A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm.

## Install

### How do I install the fp-conv MCP server?

fp-conv runs locally as an npm package, launched with npx -y fp-conv-mcp. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add sw23-fp-conv-mcp -- npx -y fp-conv-mcp
```

### Cursor

```json
{
  "mcpServers": {
    "sw23-fp-conv-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "fp-conv-mcp"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "sw23-fp-conv-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "fp-conv-mcp"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add sw23-fp-conv-mcp -- npx -y fp-conv-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "sw23-fp-conv-mcp": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "fp-conv-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add sw23-fp-conv-mcp --command npx --arg -y --arg fp-conv-mcp
```

### Hermes

```yaml
mcp_servers:
  sw23-fp-conv-mcp:
    command: "npx"
    args: ["-y", "fp-conv-mcp"]
```

### Netclaw

```json
{
  "McpServers": {
    "sw23-fp-conv-mcp": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "fp-conv-mcp"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add sw23-fp-conv-mcp -t stdio -c npx -a -y fp-conv-mcp
```

### Other

```json
{
  "mcpServers": {
    "sw23-fp-conv-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "fp-conv-mcp"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-01 (score 79, +15)

- [security improvement] Malware scan: unverified → pass
- [functional regression] Security disclosure: unverified → fail

### 2026-10-31 (score 64)

First indexed and scored.

## MCP tools (5)

### `list_formats` (~42 tokens)

List formats

List all available floating-point and integer format presets supported by this converter. Returns format keys, names, categories, and parameters (bits, exponent, mantissa, etc.).

### `encode_number` (~283 tokens)

Encode number

Encode a decimal number (or special value like Infinity / NaN) into a specified floating-point or integer format. Returns binary, hex, and component breakdown.

Input parameters:

- `format` (string|object, required): Format preset key (e.g. "fp32", "int8") or custom format object. For floating-point: { signBits, exponentBits, mantissaBits, bias?, hasInfinity?, hasNaN?, hasSubnormals? }. For integer: { bits, signe…
- `overflowMode` (string): What an out-of-range magnitude becomes. "overflow" produces Infinity (or NaN when the format has no Infinity); "saturate" clamps to the largest finite value. Omit to use the per-format default (overf…
- `roundingMode` (string): Rounding mode for encoding the value. Options: "tiesToEven" (default, IEEE 754), "tiesToAway", "towardZero", "towardPositive", "towardNegative".
- `value` (number|string, required): The value to encode. Accepts a number, hex string (e.g. "0xFF"), or keyword ("infinity", "-infinity", "nan").

### `decode_bits` (~95 tokens)

Decode bits

Decode a binary or hexadecimal bit-pattern into a specified format. Returns the decimal value and full component breakdown.

Input parameters:

- `bits` (string, required): Bit-pattern as a binary string (e.g. "0100000001001000") or hex string with 0x prefix (e.g. "0x4048").
- `format` (string|object, required): Format preset key (e.g. "fp16") or custom format object.

### `convert_format` (~448 tokens)

Convert format

Convert a value or bit pattern from one floating-point or integer format to another. Returns full encoding details for both formats and precision loss analysis.

Input parameters:

- `bits` (string): The source as a bit pattern in the input format, binary (e.g. "0011110000000000") or hex with 0x prefix (e.g. "0x3C00"), read as decode_bits reads it and converted exactly as given. Use it to convert…
- `inputFormat` (string|object, required): Source format preset key or custom format object.
- `nanMode` (string): What a NaN source operand becomes; it has no effect on any other input. "canonical" gives the output format's canonical quiet NaN. "preserve" keeps the sign and as many high-order payload bits as fit…
- `outputFormat` (string|object, required): Target format preset key or custom format object.
- `overflowMode` (string): What an out-of-range output magnitude becomes; the source operand is built with the input format's defaults. "overflow" produces Infinity (or NaN when the format has no Infinity); "saturate" clamps t…
- `roundingMode` (string): Rounding mode for encoding into the output format; the source operand is built with the input format's defaults. Options: "tiesToEven" (default, IEEE 754), "tiesToAway", "towardZero", "towardPositive…
- `value` (number|string): The value to convert. Accepts a number, hex string (read as an integer, e.g. "0xFF" is 255), or keyword. Exactly one of "value" and "bits" is required.

### `get_format_info` (~62 tokens)

Get format info

Get detailed information about a floating-point or integer format, including value range (max/min normal, subnormal), bias, and special value support.

Input parameters:

- `format` (string|object, required): Format preset key (e.g. "bf16") or custom format object.

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/sw23-fp-conv-mcp/fp-conv-mcp#diagnostics

## Score history

- 2026-11-05: 79
- 2026-11-04: 79
- 2026-11-03: 79
- 2026-11-02: 79
- 2026-11-01: 79
- 2026-10-31: 64

## Common questions

### What is the fp-conv MCP server?

fp-conv is an MCP server listed in the public MCP registry as io.github.sw23/fp-conv-mcp. Encode, decode, and convert numbers across FP32, FP16, BF16, TF32, FP8/6/4, and integer formats. This page covers its npm package (fp-conv-mcp).

### Is the fp-conv MCP server safe to use?

fp-conv scores 79 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 5 November 2026. It declares no install or post-install scripts. Its build provenance is signed and verified. 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 fp-conv MCP server expose?

fp-conv exposes 5 tools: list_formats, encode_number, decode_bits, convert_format, get_format_info. Their descriptions and schemas cost roughly 930 tokens of context every time the server is loaded.

### Is the fp-conv MCP server still maintained?

fp-conv is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the fp-conv MCP server under?

fp-conv declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

### What did VerifyMCP test on the fp-conv MCP server?

VerifyMCP ran 15 checks on fp-conv, covering Malware scan, Known CVEs, Install scripts, Dependency health and 11 more. One item could not be completed, a gap on our side rather than a finding about fp-conv: Stability. One category scores 0 for that reason, because we only credit what we can confirm. Endpoint Security and Transport & Reachability do not apply to an npm package, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.

## Links

- npm package: https://www.npmjs.com/package/fp-conv-mcp
- Socket report: https://socket.dev/npm/package/fp-conv-mcp
- Repository: https://github.com/sw23/fp-conv
- Website: https://github.com/sw23/fp-conv/tree/main/packages/fp-conv-mcp#readme
- Changelog RSS feed: https://verifymcp.io/servers/sw23-fp-conv-mcp/fp-conv-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/sw23-fp-conv-mcp/fp-conv-mcp/changelog.json
- Trust report (JSON): https://verifymcp.io/servers/sw23-fp-conv-mcp/fp-conv-mcp.json
- HTML version of this page: https://verifymcp.io/servers/sw23-fp-conv-mcp/fp-conv-mcp