# io.github.tci-nebula/mermaid-render-mcp (npm · mermaid-render-mcp)

Renders Mermaid diagram syntax to PNG or SVG images for LLM clients

- Trust score: 82/100 (high trust)
- Change this week: 0
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-20

## Components

- npm · `mermaid-render-mcp`: 82/100 (this document), [markdown](https://verifymcp.io/servers/tci-nebula-mermaid-render-mcp/mermaid-render-mcp.md), [page](https://verifymcp.io/servers/tci-nebula-mermaid-render-mcp/mermaid-render-mcp)

## Channel facts

- Registry: `npm`
- Package: `mermaid-render-mcp`
- Version: `1.3.0`
- 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 2026-09-20.

- **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.
  - 108 of 269 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 48/100
  - 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 31 days ago).
  - Publishes a security disclosure policy (SECURITY.md).
- **Schema Quality & AI Usability**: 77/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 221 tokens (~221/item across 1 items; 1 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 83/100
  - Stability observed for 25 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **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 1 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 1 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.

## Install

### How do I install the io.github.tci-nebula/mermaid-render-mcp server?

io.github.tci-nebula/mermaid-render-mcp runs locally as an npm package, launched with npx -y mermaid-render-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 tci-nebula-mermaid-render-mcp -- npx -y mermaid-render-mcp
```

### Cursor

```json
{
  "mcpServers": {
    "tci-nebula-mermaid-render-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "mermaid-render-mcp"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "tci-nebula-mermaid-render-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "mermaid-render-mcp"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add tci-nebula-mermaid-render-mcp -- npx -y mermaid-render-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "tci-nebula-mermaid-render-mcp": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "mermaid-render-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add tci-nebula-mermaid-render-mcp --command npx --arg -y --arg mermaid-render-mcp
```

### Hermes

```yaml
mcp_servers:
  tci-nebula-mermaid-render-mcp:
    command: "npx"
    args: ["-y", "mermaid-render-mcp"]
```

### Netclaw

```json
{
  "McpServers": {
    "tci-nebula-mermaid-render-mcp": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "mermaid-render-mcp"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add tci-nebula-mermaid-render-mcp -t stdio -c npx -a -y mermaid-render-mcp
```

### Other

```json
{
  "mcpServers": {
    "tci-nebula-mermaid-render-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "mermaid-render-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.

### 2026-09-19 (score 82, −3)

- [functional] Stability: pass → 0.80

### 2026-09-18 (score 85, +1)

- [security] Stability: 0.97 → pass

### 2026-09-16 (score 84, +1)

No change was recorded against any check on this day. Stability & Change Management went from 90 to 93. That category is still filling its 30-day observation window: 27 days of observed history at the previous scan, 28 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-15 (score 83, 0)

- [functional] Package version: 1.2.0 → 1.3.0

### 2026-09-14 (score 83, +1)

No change was recorded against any check on this day. Stability & Change Management went from 83 to 87. That category is still filling its 30-day observation window: 25 days of observed history at the previous scan, 26 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-11 (score 82, +1)

No change was recorded against any check on this day. Stability & Change Management went from 73 to 77. That category is still filling its 30-day observation window: 22 days of observed history at the previous scan, 23 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-09 (score 81, +1)

No change was recorded against any check on this day. Stability & Change Management went from 67 to 70. That category is still filling its 30-day observation window: 20 days of observed history at the previous scan, 21 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-07 (score 80, +1)

No change was recorded against any check on this day. Stability & Change Management went from 60 to 63. That category is still filling its 30-day observation window: 18 days of observed history at the previous scan, 19 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (1)

### `render_diagram` (~221 tokens)

Render Mermaid diagram syntax into a PNG, SVG, or PDF — or convert it to an editable draw.io (.drawio) file. Returns the result as base64-encoded data (drawio: XML text), or writes it to output_path if given. drawio format supports flowcharts only.

Input parameters:

- `background` (string): Background colour (CSS colour string or "transparent").
- `format` (string): Output format. Defaults to png. drawio produces an editable draw.io XML file (flowcharts only).
- `output_path` (string): Absolute file path to write the result to. When given, the file is written to disk and no base64 data is returned — useful for documents destined for printing or formal submission.
- `pdfFit` (boolean): Scale the PDF page to fit the diagram (PDF only).
- `syntax` (string, required): Mermaid diagram definition (e.g. flowchart, sequenceDiagram, etc.)
- `theme` (string): Visual theme for the diagram.
- `width` (number): Canvas width in pixels (PNG only).

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/tci-nebula-mermaid-render-mcp/mermaid-render-mcp#diagnostics

## Score history

- 2026-09-20: 82
- 2026-09-19: 82
- 2026-09-18: 85
- 2026-09-17: 84
- 2026-09-16: 84
- 2026-09-15: 83
- 2026-09-14: 83
- 2026-09-13: 82
- 2026-09-12: 82
- 2026-09-11: 82
- 2026-09-10: 81
- 2026-09-09: 81
- 2026-09-08: 80
- 2026-09-07: 80
- 2026-09-06: 79
- 2026-09-05: 79
- 2026-09-04: 78
- 2026-09-03: 78
- 2026-09-02: 77
- 2026-09-01: 77
- 2026-08-31: 76
- 2026-08-30: 76
- 2026-08-29: 75
- 2026-08-28: 75
- 2026-08-27: 75
- 2026-08-26: 71
- 2026-08-25: 69
- 2026-08-24: 69
- 2026-08-23: 69
- 2026-08-22: 69

## Common questions

### What is the io.github.tci-nebula/mermaid-render-mcp server?

io.github.tci-nebula/mermaid-render-mcp is listed in the public MCP registry as io.github.tci-nebula/mermaid-render-mcp. Renders Mermaid diagram syntax to PNG or SVG images for LLM clients. This page covers its npm package (mermaid-render-mcp).

### Is the io.github.tci-nebula/mermaid-render-mcp server safe to use?

io.github.tci-nebula/mermaid-render-mcp scores 82 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 io.github.tci-nebula/mermaid-render-mcp server expose?

io.github.tci-nebula/mermaid-render-mcp exposes 1 tool: render_diagram. Their descriptions and schemas cost roughly 221 tokens of context every time the server is loaded.

### Is the io.github.tci-nebula/mermaid-render-mcp server still maintained?

io.github.tci-nebula/mermaid-render-mcp 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 io.github.tci-nebula/mermaid-render-mcp server under?

io.github.tci-nebula/mermaid-render-mcp 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/mermaid-render-mcp
- Socket report: https://socket.dev/npm/package/mermaid-render-mcp
- Repository: https://github.com/tci-nebula/mermaid-mcp
- Changelog RSS feed: https://verifymcp.io/servers/tci-nebula-mermaid-render-mcp/mermaid-render-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/tci-nebula-mermaid-render-mcp/mermaid-render-mcp.json
- HTML version of this page: https://verifymcp.io/servers/tci-nebula-mermaid-render-mcp/mermaid-render-mcp