# MarvinLabs vram_fit (remote · marvinlabs.org)

Will a QLoRA fine-tune of gemma-3-4b-it fit your GPU? Verdicts from measured AMD and NVIDIA probes.

- Trust score: 69/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `marvinlabs.org`: 69/100 (this document), [markdown](https://verifymcp.io/servers/org-marvinlabs-vram-fit/marvinlabs.md), [page](https://verifymcp.io/servers/org-marvinlabs-vram-fit/marvinlabs)

## Channel facts

- Endpoint: `https://marvinlabs.org/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.1.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, 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.

- **Endpoint Security**: 74/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 54/100
  - AI-judged instruction clarity (fair).
  - Context-footprint check failed: tool/resource definitions use about 547 tokens (~182/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**: 37/100
  - Stability observed for 11 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 82/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 46% 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**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the MarvinLabs vram_fit MCP server?

MarvinLabs vram_fit is a hosted endpoint at https://marvinlabs.org/mcp, so there is nothing to install locally. 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 --transport http org-marvinlabs-vram-fit 'https://marvinlabs.org/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "org-marvinlabs-vram-fit": {
      "url": "https://marvinlabs.org/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "org-marvinlabs-vram-fit": {
      "type": "http",
      "url": "https://marvinlabs.org/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.org-marvinlabs-vram-fit]
url = "https://marvinlabs.org/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "org-marvinlabs-vram-fit": {
      "type": "remote",
      "url": "https://marvinlabs.org/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add org-marvinlabs-vram-fit --url 'https://marvinlabs.org/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  org-marvinlabs-vram-fit:
    url: "https://marvinlabs.org/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "org-marvinlabs-vram-fit": {
      "Transport": "http",
      "Url": "https://marvinlabs.org/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add org-marvinlabs-vram-fit -t streamable-http -u 'https://marvinlabs.org/mcp'
```

### Other

```json
{
  "mcpServers": {
    "org-marvinlabs-vram-fit": {
      "type": "http",
      "url": "https://marvinlabs.org/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## 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.

### 2026-11-04 (score 69, +1)

No change was recorded against any check on this day. Stability & Change Management went from 30 to 33. That category is still filling its 30-day observation window: 9 days of observed history at the previous scan, 10 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-30 (score 67, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-28 (score 66, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-26 (score 65, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-25 (score 64)

First indexed and scored.

## MCP tools (3)

### `vram_fit` (~201 tokens)

Will this LoRA config train on a card with vram_gb GB? Returns verdict fits / tight / does_not_fit, the predicted peak in MB, the margin, how each part was derived, and any measured probe with the same settings.

Input parameters:

- `dora` (boolean)
- `lora_dropout` (number)
- `model` (string)
- `os` (string): windows or linux; Windows spills instead of OOM
- `other_processes_mb` (number): VRAM already held by other programs
- `quant` (string): Base weights: bitsandbytes nf4 or bf16
- `rank` (integer, required)
- `response_len` (integer): Tokens the loss covers (the response span)
- `seq_len` (integer): Longest training example, in tokens
- `vram_gb` (number, required): Card memory as sold, in GB (8, 12, 16, 24...)

### `vram_max_rank` (~172 tokens)

Largest LoRA rank (multiple of 8) that fits with margin on a card with vram_gb GB, and the largest that is tight (a real run may fit, the one-step probe would not).

Input parameters:

- `dora` (boolean)
- `lora_dropout` (number)
- `model` (string)
- `other_processes_mb` (number): VRAM already held by other programs
- `quant` (string): Base weights: bitsandbytes nf4 or bf16
- `response_len` (integer): Tokens the loss covers (the response span)
- `seq_len` (integer): Longest training example, in tokens
- `vram_gb` (number, required): Card memory as sold, in GB (8, 12, 16, 24...)

### `vram_probes` (~103 tokens)

The raw measured probe rows (RX 7900 XTX and RTX 3060 Ti), filtered by any of the given settings. gpu matches part of the card name, e.g. '7900' or '3060'.

Input parameters:

- `dora` (boolean)
- `gpu` (string)
- `lora_dropout` (number)
- `quant` (string)
- `rank` (integer)
- `seq_len` (integer)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/org-marvinlabs-vram-fit/marvinlabs#diagnostics

## Score history

- 2026-11-05: 69
- 2026-11-04: 69
- 2026-11-03: 68
- 2026-11-02: 68
- 2026-11-01: 68
- 2026-10-31: 67
- 2026-10-30: 67
- 2026-10-29: 66
- 2026-10-28: 66
- 2026-10-27: 65
- 2026-10-26: 65
- 2026-10-25: 64

## Common questions

### What is the MarvinLabs vram_fit MCP server?

MarvinLabs vram_fit is an MCP server listed in the public MCP registry as org.marvinlabs/vram-fit. Will a QLoRA fine-tune of gemma-3-4b-it fit your GPU? Verdicts from measured AMD and NVIDIA probes. This page covers its hosted endpoint (https://marvinlabs.org/mcp).

### Is the MarvinLabs vram_fit MCP server safe to use?

MarvinLabs vram_fit scores 69 out of 100 on VerifyMCP. 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 MarvinLabs vram_fit MCP server expose?

MarvinLabs vram_fit exposes 3 tools: vram_fit, vram_max_rank, vram_probes. Their descriptions and schemas cost roughly 476 tokens of context every time the server is loaded.

### Does the MarvinLabs vram_fit MCP server require authentication?

No. We connected to MarvinLabs vram_fit without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the MarvinLabs vram_fit MCP server still maintained?

MarvinLabs vram_fit 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.

## Links

- Remote endpoint: https://marvinlabs.org/mcp
- Website: https://marvinlabs.org/vram
- Changelog RSS feed: https://verifymcp.io/servers/org-marvinlabs-vram-fit/marvinlabs.xml
- Changelog JSON feed: https://verifymcp.io/servers/org-marvinlabs-vram-fit/marvinlabs.json
- HTML version of this page: https://verifymcp.io/servers/org-marvinlabs-vram-fit/marvinlabs