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8 clients · secrets stay placeholders

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{
  "mcpServers": {
    "fractal-arena": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "FRACTAL_ARENA_API_KEY": "${FRACTAL_ARENA_API_KEY}"
      }
    }
  }
}

claude mcp add fractal-arena -e "FRACTAL_ARENA_API_KEY=${FRACTAL_ARENA_API_KEY}" -- npx -y [email protected]

[mcp_servers.fractal-arena]
command = "npx"
args = ["-y", "[email protected]"]
env = { "FRACTAL_ARENA_API_KEY" = "${FRACTAL_ARENA_API_KEY}" }

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "fractal-arena": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "[email protected]"
      ],
      "enabled": true,
      "environment": {
        "FRACTAL_ARENA_API_KEY": "{env:FRACTAL_ARENA_API_KEY}"
      }
    }
  }
}

{
  "mcpServers": {
    "fractal-arena": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "FRACTAL_ARENA_API_KEY": "${FRACTAL_ARENA_API_KEY}"
      }
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=fractal-arena&config=eyJjb21tYW5kIjoibnB4IiwiYXJncyI6WyIteSIsImZyYWN0YWwtYXJlbmEtbWNwQDEuMTguMCJdLCJlbnYiOnsiRlJBQ1RBTF9BUkVOQV9BUElfS0VZIjoiJHtGUkFDVEFMX0FSRU5BX0FQSV9LRVl9In19"
}

{
  "servers": {
    "fractal-arena": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "FRACTAL_ARENA_API_KEY": "${FRACTAL_ARENA_API_KEY}"
      }
    }
  }
}

{
  "mcpServers": {
    "fractal-arena": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "FRACTAL_ARENA_API_KEY": "${FRACTAL_ARENA_API_KEY}"
      }
    }
  }
}

extensions:
  "fractal-arena":
    enabled: true
    name: "fractal-arena"
    type: stdio
    cmd: "npx"
    args:
      - "-y"
      - "[email protected]"
    envs:
      "FRACTAL_ARENA_API_KEY": "${FRACTAL_ARENA_API_KEY}"
    timeout: 300

Placeholders to fill from your own secret store: ${FRACTAL_ARENA_API_KEY}. The registry never accepts secret values.

This is a local package: the command runs on your machine.

Quality – / 100not scored

Not scored: fewer than three checks apply, usually because no remote answered a credential-free probe or the server is a local package.

protocoln/a · weight 25

n/a
protocol.modern, protocol.stateless, protocol.transport, protocol.list_ttlno remote answered a protocol handshake (not probed yet, unreachable, or local-only)

authorizationn/a · weight 15

n/a
auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
n/a
auth.secret_in_urlno templated URL

tool hygienen/a · weight 30

n/a
tools.descriptions, tools.description_length, tools.schemas, tools.annotations, tools.directory_hints, tools.token_cost, tools.api_dumptool list unknown (behind auth, not probed, or empty)

stabilityn/a · weight 15

n/a
stability.changes, stability.rug_pulltool list unknown

dependencies100 · weight 15

pass
deps.known_vulnsno known advisory in 98 resolved packages
pass
deps.mcp_sdk_version@modelcontextprotocol/sdk 1.31.0, no known advisory
pass
deps.resolvable[email protected] resolved: 98 packages

Tool list unknown · checked 2026-10-20 14:21 UTC

Tool changes

No tool definition changes recorded. A server's first observation is its baseline; later probes record what changes.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 66 / 100

no-repository

provenance35

livenessn/a

freshness100

hygiene80

~liveness-unmeasured +updated-22d-ago -no-repository

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Dependencies

[email protected] npm97 dependencies, resolved · MCP SDK @modelcontextprotocol/sdk 1.31.0 · advisories checked 2026-10-19

No known advisory affects this dependency graph.

Dependency graphs from deps.dev; advisories from OSV.dev, including the GitHub Advisory Database and the PyPI Advisory Database; all CC BY 4.0. The graph is what a clean install of this version resolves today; nothing was installed or run. How it is checked.

Endpoints

package	registry	version	runtime	secrets
`fractal-arena-mcp`	npm	1.18.0	–	`FRACTAL_ARENA_API_KEY`

Tools (0)

No tools observed. Local packages are never executed by the registry.

Schemas: list_tools.

Similar MCP servers

Official server.json

{
  "name": "io.github.Arthefacte/fractal-arena",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "version": "1.18.0",
  "packages": [
    {
      "version": "1.18.0",
      "transport": {
        "type": "stdio"
      },
      "identifier": "fractal-arena-mcp",
      "registryType": "npm",
      "environmentVariables": [
        {
          "name": "FRACTAL_ARENA_API_KEY",
          "format": "string",
          "isSecret": true,
          "isRequired": true,
          "description": "Your Fractal Arena agent API key (agent_<uuid>.<secret>, shown exactly once at registration). Required for the authenticated tools (ladder, Fosse, wallet, deposit)."
        },
        {
          "name": "FRACTAL_ARENA_API_URL",
          "format": "string",
          "description": "Base URL of the Fractal Arena agent API. Defaults to https://fractal-arena-server-production.up.railway.app"
        }
      ]
    }
  ],
  "description": "Play Fractal Arena, a 3v3 auto-battler on Fractal Bitcoin, earn $FRACTALARENA by playing well."
}