# D20DAO Verifiable Randomness (npm · @d20dao/mcp)

Verifiable dice, draws and shuffles with on-chain VRF proofs on Arc. 0.05 USDC per draw.

- Trust score: 69/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-25

## Components

- npm · `@d20dao/mcp`: 69/100 (this document), [markdown](https://verifymcp.io/servers/org-d20dao-vrf/d20dao-mcp.md), [page](https://verifymcp.io/servers/org-d20dao-vrf/d20dao-mcp)

## Channel facts

- Registry: `npm`
- Package: `@d20dao/mcp`
- Version: `0.1.0`
- 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 2026-09-25.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - 0 of 4 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 45/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 5 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 (excellent).
  - Context-footprint check failed: tool/resource definitions use about 750 tokens (~250/item across 3 items; 3 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 3 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 4 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (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 D20DAO Verifiable Randomness MCP server?

D20DAO Verifiable Randomness runs locally as an npm package, launched with npx -y @d20dao/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 org-d20dao-vrf -- npx -y @d20dao/mcp
```

### Cursor

```json
{
  "mcpServers": {
    "org-d20dao-vrf": {
      "command": "npx",
      "args": [
        "-y",
        "@d20dao/mcp"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "org-d20dao-vrf": {
      "command": "npx",
      "args": [
        "-y",
        "@d20dao/mcp"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add org-d20dao-vrf -- npx -y @d20dao/mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "org-d20dao-vrf": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@d20dao/mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add org-d20dao-vrf --command npx --arg -y --arg @d20dao/mcp
```

### Hermes

```yaml
mcp_servers:
  org-d20dao-vrf:
    command: "npx"
    args: ["-y", "@d20dao/mcp"]
```

### Netclaw

```json
{
  "McpServers": {
    "org-d20dao-vrf": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "@d20dao/mcp"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add org-d20dao-vrf -t stdio -c npx -a -y @d20dao/mcp
```

### Other

```json
{
  "mcpServers": {
    "org-d20dao-vrf": {
      "command": "npx",
      "args": [
        "-y",
        "@d20dao/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.

### 2026-09-25 (score 69, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-09-21 (score 69, +15)

- [security improvement] Malware scan: unverified → pass

### 2026-09-20 (score 54)

First indexed and scored.

## MCP tools (3)

### `draw` (~426 tokens)

Draw verifiable randomness (0.05 USDC)

Draw verifiable randomness for 0.05 USDC: dice, a coin flip, a number in a range, one or several winners, or a shuffle. Opens one VRF request on Arc and returns the result with request, fulfillment and proof links; the optional seed is bound to the payment on chain. Pays from the user's Circle Agent Wallet. One call returns every value of its operation, so ask once and never repeat a call to re-roll. An identical call within five minutes returns the earlier draw without paying; give each separate draw its own seed. The user sets a daily spending cap, so draws can run out: a paid answer carries what is left, and setup_status shows the cap.

Input parameters:

- `count` (integer): dice: rolls, 1 to 128 (default 1). chooseMany: distinct picks, required.
- `items` (array): chooseOne, chooseMany, shuffle: labels to draw from (1 to 256, each at most 200 bytes). Only their count is proven; the answer adds picked. Give this or population.
- `max`: range only, required: highest value, inclusive, at least min.
- `min`: range only, required: lowest value, inclusive.
- `operation` (string, required): raw: one 256-bit word. coinFlip: 0 (tails) or 1 (heads). dice: count rolls of 1 to sides. range: one integer from min to max. chooseOne: one zero-based index. chooseMany: count distinct indices. shuf…
- `population` (integer): chooseOne, chooseMany, shuffle: how many to draw from, 1 to 256. Give this or items.
- `seed` (string): Context bound on chain to this draw, such as "raffle-7 round 2" (at most 64 bytes). Use a new seed for each separate draw. To commit to an item list, put its hash here.
- `sides`: dice only, required: faces per die, at least 2.

### `get_result` (~102 tokens)

Read a draw (free)

Read a paid draw by paymentId, or a request by requestId, for free. Use it to finish a draw that came back pending or unanswered. Chosen items come back as indices here, not as labels: apply them to the list you sent.

Input parameters:

- `paymentId` (string): The paymentId of a paid draw (0x and 64 hex characters).
- `requestId` (string): A request id this API opened, as a decimal string.

### `setup_status` (~39 tokens)

Check payment setup (free)

Check whether draws can be paid: the Circle CLI, its login, the agent wallet, its Gateway balance and today's spending. Returns the next setup step.

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/org-d20dao-vrf/d20dao-mcp#diagnostics

## Score history

- 2026-09-25: 69
- 2026-09-24: 69
- 2026-09-23: 69
- 2026-09-22: 69
- 2026-09-21: 69
- 2026-09-20: 54

## Common questions

### What is the D20DAO Verifiable Randomness MCP server?

D20DAO Verifiable Randomness is an MCP server listed in the public MCP registry as org.d20dao/vrf. Verifiable dice, draws and shuffles with on-chain VRF proofs on Arc. 0.05 USDC per draw. This page covers its npm package (@d20dao/mcp).

### Is the D20DAO Verifiable Randomness MCP server safe to use?

D20DAO Verifiable Randomness scores 69 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 25 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 D20DAO Verifiable Randomness MCP server expose?

D20DAO Verifiable Randomness exposes 3 tools: draw, get_result, setup_status. Their descriptions and schemas cost roughly 567 tokens of context every time the server is loaded.

### Is the D20DAO Verifiable Randomness MCP server still maintained?

D20DAO Verifiable Randomness is still listed as active in the MCP registry. We last reached this channel on 25 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 D20DAO Verifiable Randomness MCP server under?

D20DAO Verifiable Randomness 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/@d20dao/mcp
- Socket report: https://socket.dev/npm/package/@d20dao/mcp
- Repository: https://github.com/d20dao/mcp
- Website: https://d20dao.org/docs/agents
- Changelog RSS feed: https://verifymcp.io/servers/org-d20dao-vrf/d20dao-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/org-d20dao-vrf/d20dao-mcp.json
- HTML version of this page: https://verifymcp.io/servers/org-d20dao-vrf/d20dao-mcp