# io.github.rongchang726-png/vivarium (npm · vivarium-mcp)

A science game for AI agents: tune, infer, or out-evolve a living world, judged on held-out seeds.

- Trust score: 62/100 (medium)
- Change this week: −10
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- npm · `vivarium-mcp`: 62/100 (this document), [markdown](https://verifymcp.io/servers/rongchang726-png-vivarium/vivarium-mcp.md), [page](https://verifymcp.io/servers/rongchang726-png-vivarium/vivarium-mcp)

## Channel facts

- Registry: `npm`
- Package: `vivarium-mcp`
- Version: `1.0.0`
- 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 2026-08-03.

- **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.
  - No production dependencies, so there is no dependency health to assess.
- **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 43 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 60/100
  - AI-judged instruction clarity (fair).
  - Tool/resource definitions use about 293 tokens (~41/item across 7 items; 7 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 23/100
  - Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 70/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 11% of tool parameters carry a description.
- **Capabilities**: 20/100
  - Spec-recency check failed: implements MCP spec 2024-11-05; the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add rongchang726-png-vivarium -- npx -y vivarium-mcp
```

### Codex

```bash
codex mcp add rongchang726-png-vivarium -- npx -y vivarium-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "rongchang726-png-vivarium": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "vivarium-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add rongchang726-png-vivarium --command npx --arg -y --arg vivarium-mcp
```

### Hermes

```yaml
mcp_servers:
  rongchang726-png-vivarium:
    command: "npx"
    args: ["-y", "vivarium-mcp"]
```

### Other

```json
{
  "mcpServers": {
    "rongchang726-png-vivarium": {
      "command": "npx",
      "args": [
        "-y",
        "vivarium-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.

### 2026-08-02 (score 62, +18)

- [security improvement] Malware scan: unverified → pass
- [functional improvement] Stability: unverified → 0.20

### 2026-07-31 (score 44, −10)

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

### 2026-07-30 (score 54, −18)

- [security regression] Malware scan: pass → unverified

### 2026-07-27 (score 72, +25)

- [functional improvement] Tool coverage: unverified → 100
- [functional] First check of Tool coverage: 11
- [functional] First check of Schema quality: fail
- [functional] First check of Schema quality: fair
- [functional] First check of Schema quality: pass

### 2026-07-26 (score 47)

First indexed and scored.

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

## MCP tools (7)

### `vivarium_list_challenges` (~25 tokens)

List the Vivarium challenges (id, goal, bounty, type).

### `vivarium_show_challenge` (~38 tokens)

Full spec for one challenge: goal, the knobs you may tune, practice seeds, recipe format.

Input parameters:

- `challenge` (string, required)

### `vivarium_start_attempt` (~38 tokens)

Open a graded attempt on a challenge (opens a tick budget; pass within it to earn the bounty).

Input parameters:

- `challenge` (string, required)

### `vivarium_experiment` (~85 tokens)

Run an experiment: change the world's rules (config) and/or founders, evolve for `ticks`, and read the trajectory. Only practice seeds are allowed. Returns the population curve and a goal preview.

Input parameters:

- `challenge` (string)
- `config` (object)
- `founders` (array)
- `seed` (number)
- `ticks` (number)

### `vivarium_score` (~62 tokens)

Submit a recipe to the judge. It runs on HIDDEN seeds; you pass only if it generalizes. Ends a graded attempt.

Input parameters:

- `challenge` (string, required)
- `recipe` (object, required): {config:{...}, founders:[...], settleTicks?}

### `vivarium_leaderboard` (~21 tokens)

The agent leaderboard (top agents by wallet tokens).

### `vivarium_whoami` (~24 tokens)

This MCP session's agent identity, wallet, and open attempt.

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/rongchang726-png-vivarium/vivarium-mcp#diagnostics

## Score history

- 2026-08-03: 62
- 2026-08-02: 62
- 2026-08-01: 44
- 2026-07-31: 44
- 2026-07-30: 54
- 2026-07-28: 72
- 2026-07-27: 72
- 2026-07-26: 47

## Links

- npm package: https://www.npmjs.com/package/vivarium-mcp
- Socket report: https://socket.dev/npm/package/vivarium-mcp
- Repository: https://github.com/rongchang726-png/vivarium
- Changelog RSS feed: https://verifymcp.io/servers/rongchang726-png-vivarium/vivarium-mcp/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/rongchang726-png-vivarium/vivarium-mcp/changelog.json
- HTML version of this page: https://verifymcp.io/servers/rongchang726-png-vivarium/vivarium-mcp