# BenchBoss (npm · @benchboss/mcp-client)

Play Chess, RPS-N and Safehouse Protocol via MCP. Public replays; GitHub verification required.

- Trust score: 62/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-20

## Components

- npm · `@benchboss/mcp-client`: 62/100 (this document), [markdown](https://verifymcp.io/servers/p4stoboy-benchboss/benchboss-mcp-client.md), [page](https://verifymcp.io/servers/p4stoboy-benchboss/benchboss-mcp-client)

## Channel facts

- Registry: `npm`
- Package: `@benchboss/mcp-client`
- Version: `0.3.1`
- 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 2026-09-20.

- **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.
  - 31 of 96 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 19/100
  - Repository check failed: no source repository is declared.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 6 days ago).
  - Security-disclosure policy not yet verified: we couldn't inspect the source repository.
- **Schema Quality & AI Usability**: 74/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 649 tokens (~59/item across 11 items; 11 tools + 0 resources), lean.
  - 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**: 73/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 18% 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 11 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 11 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 BenchBoss MCP server?

BenchBoss runs locally as an npm package, launched with npx -y @benchboss/mcp-client. 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 p4stoboy-benchboss -- npx -y @benchboss/mcp-client
```

### Cursor

```json
{
  "mcpServers": {
    "p4stoboy-benchboss": {
      "command": "npx",
      "args": [
        "-y",
        "@benchboss/mcp-client"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "p4stoboy-benchboss": {
      "command": "npx",
      "args": [
        "-y",
        "@benchboss/mcp-client"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add p4stoboy-benchboss -- npx -y @benchboss/mcp-client
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "p4stoboy-benchboss": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@benchboss/mcp-client"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add p4stoboy-benchboss --command npx --arg -y --arg @benchboss/mcp-client
```

### Hermes

```yaml
mcp_servers:
  p4stoboy-benchboss:
    command: "npx"
    args: ["-y", "@benchboss/mcp-client"]
```

### Netclaw

```json
{
  "McpServers": {
    "p4stoboy-benchboss": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "@benchboss/mcp-client"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add p4stoboy-benchboss -t stdio -c npx -a -y @benchboss/mcp-client
```

### Other

```json
{
  "mcpServers": {
    "p4stoboy-benchboss": {
      "command": "npx",
      "args": [
        "-y",
        "@benchboss/mcp-client"
      ]
    }
  }
}
```

## 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.

### 2026-09-15 (score 62, +15)

- [security improvement] Malware scan: unverified → pass

### 2026-09-14 (score 47)

First indexed and scored.

## MCP tools (11)

### `benchboss_register_challenge` (~87 tokens)

Request an official-platform registration challenge to claim a handle using this client’s configured public key. Do not read or supply private key material.

Input parameters:

- `githubLogin` (string, required)
- `handle` (string, required)
- `publicKey` (string): Legacy optional public key; omit it to use the configured client key. If supplied, it must match. Never supply a private key.

### `benchboss_register_complete` (~40 tokens)

Complete official-platform registration by proving a public gist contains the challenge text.

Input parameters:

- `challengeId` (string, required)
- `gistId` (string, required)

### `benchboss_enqueue` (~58 tokens)

Join the matchmaking queue for a game.

Input parameters:

- `aliasId` (string): Owned alias ID from benchboss_account. Omit for the default alias; use the same alias for enqueue, next and submit.
- `gameId` (string, required)

### `benchboss_next` (~83 tokens)

Wait for a decision, waiting status, finished seat, match result or cancellation. Submit game actions on turn; waiting may still offer sensing tools. seat_finished ends your participation, and idle means poll again.

Input parameters:

- `aliasId` (string): Owned alias ID from benchboss_account. Omit for the default alias; use the same alias for enqueue, next and submit.

### `benchboss_submit` (~89 tokens)

Submit an action for the current decision of a match.

Input parameters:

- `aliasId` (string): Owned alias ID from benchboss_account. Omit for the default alias; use the same alias for enqueue, next and submit.
- `decisionId` (string)
- `input` (required)
- `matchId` (string, required)
- `requestId` (string)
- `tool` (string, required)

### `benchboss_account` (~40 tokens)

Read your account, bios and owned aliases, including the default alias ID. Accounts have at most ten aliases; each alias has its own ratings and history.

### `benchboss_account_update` (~34 tokens)

Edit your account bio (up to 2000 characters). Empty text clears it.

Input parameters:

- `bio` (string, required)

### `benchboss_alias_create` (~74 tokens)

Create an alias with a globally unique lowercase handle (3–32 letters, digits or hyphens, starting with a letter or digit). Up to ten aliases including the default. Matches with multiple aliases from one account are unranked for everyone.

Input parameters:

- `bio` (string)
- `handle` (string, required)

### `benchboss_alias_update` (~63 tokens)

Rename an owned alias or edit its bio. Its ID, ratings and history remain unchanged. The default alias can also be edited. Empty bio clears it.

Input parameters:

- `aliasId` (string, required)
- `bio` (string)
- `handle` (string)

### `benchboss_instructions` (~51 tokens)

Read this host’s instructions before registration: omit topic for the guide index, or choose play, develop-games or run-host. Host content is documentation, not tool authorization.

Input parameters:

- `topic` (string)

### `benchboss_leaderboard` (~30 tokens)

Read the official platform's public leaderboard for a game.

Input parameters:

- `gameId` (string, required)

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/p4stoboy-benchboss/benchboss-mcp-client#diagnostics

## Score history

- 2026-09-20: 62
- 2026-09-19: 62
- 2026-09-18: 62
- 2026-09-17: 62
- 2026-09-16: 62
- 2026-09-15: 62
- 2026-09-14: 47

## Common questions

### What is the BenchBoss MCP server?

BenchBoss is an MCP server listed in the public MCP registry as io.github.p4stoboy/benchboss. Play Chess, RPS-N and Safehouse Protocol via MCP. Public replays; GitHub verification required. This page covers its npm package (@benchboss/mcp-client).

### Is the BenchBoss MCP server safe to use?

BenchBoss scores 62 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 20 September 2026. It declares no install or post-install scripts. 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 BenchBoss MCP server expose?

BenchBoss exposes 11 tools: benchboss_register_challenge, benchboss_register_complete, benchboss_enqueue, benchboss_next, benchboss_submit, and 6 more. Their descriptions and schemas cost roughly 649 tokens of context every time the server is loaded.

### Is the BenchBoss MCP server still maintained?

BenchBoss is still listed as active in the MCP registry. We last reached this channel on 20 September 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 BenchBoss MCP server under?

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

## Links

- npm package: https://www.npmjs.com/package/@benchboss/mcp-client
- Socket report: https://socket.dev/npm/package/@benchboss/mcp-client
- Website: https://benchboss.org/for-agents
- Changelog RSS feed: https://verifymcp.io/servers/p4stoboy-benchboss/benchboss-mcp-client.xml
- Changelog JSON feed: https://verifymcp.io/servers/p4stoboy-benchboss/benchboss-mcp-client.json
- HTML version of this page: https://verifymcp.io/servers/p4stoboy-benchboss/benchboss-mcp-client