# render_mermaid

pdfpeek: Render Mermaid diagram code to an SVG or PNG image. Returns Mermaid diagram code drawn as an SVG or PNG file in an offline sandboxed browser: format svg | png, theme (default, dark, forest, neutral, base), scale 1-4 for PNG (default 2, sharp when zoomed). File base64 in file (output=url gives a 24 h link). A syntax error is a 422 invalid_diagram with the line number; over 8,000 x 8,000 px a 422, a PNG over 8 MB a 413 (none charged). Mermaid 11.4.1, strict security, no network. Typically 1-3 s. Price: USD 0.003. No free tier.

Agent View of the PolicyLayer registry record for `render_mermaid`. HTML page: https://policylayer.com/tools/dev-tanod-tanod/render-mermaid

## Facts

- Tool: `render_mermaid`
- Server: Tanod (`https://tanod.dev/mcp`) — https://policylayer.com/tools/dev-tanod-tanod.md
- Homepage: https://github.com/https://tanod.dev/mcp
- Risk category: Execute (High risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server CORS policy: *
- Server rate-limited: no
- Parameters: 5 (1 required)
- Recommended policy verdict: Rate-limited

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `code` | string | yes | Mermaid diagram source (flowchart, sequence, class, state, ER, gantt, pie, git graph, mindmap, timeline and the other types of mermaid 11.4.1), 1-20,000 charact |
| `scale` | number | no | PNG pixel density, 1-4 (default 2, sharp when zoomed). Lowered automatically so the longest side stays at 8,000 px. Ignored for svg. |
| `theme` | string | no | Mermaid theme. dark gives a dark background in PNG; the others a white one. |
| `format` | string | no | svg (default, scalable, plain text labels) or png. |
| `output` | string | no | base64 (default): inline. url: stored for 24 hours; link, metadata. |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "render_mermaid",
    "arguments": {
      "code": "<code>"
    }
  }
}
```

## Why render_mermaid is rated High

render_mermaid triggers real processes with real consequences. An agent gone sideways doesn't fire it once. It starts dozens of builds, sends mass notifications, or burns through compute before anyone looks up.

Risk signals: Accepts freeform code/query input (code)

## Use case

AI agents invoke render_mermaid to trigger actions in Tanod. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Tanod:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "render_mermaid": {
      "limits": [
        {
          "counter": "render_mermaid_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Tanod (307)

- `audit_token_approvals` — Destructive — https://policylayer.com/tools/dev-tanod-tanod/audit-token-approvals.md
- `aurora_forecast` — Destructive — https://policylayer.com/tools/dev-tanod-tanod/aurora-forecast.md
- `diff_text` — Destructive — https://policylayer.com/tools/dev-tanod-tanod/diff-text.md
- `image_metadata` — Destructive — https://policylayer.com/tools/dev-tanod-tanod/image-metadata.md
- `pdf_pipeline` — Destructive — https://policylayer.com/tools/dev-tanod-tanod/pdf-pipeline.md
- `pdf_protect` — Destructive — https://policylayer.com/tools/dev-tanod-tanod/pdf-protect.md
- `pdf_remove_pages` — Destructive — https://policylayer.com/tools/dev-tanod-tanod/pdf-remove-pages.md
- `pdf_reorder_pages` — Destructive — https://policylayer.com/tools/dev-tanod-tanod/pdf-reorder-pages.md
- `build_ics_event` — Execute — https://policylayer.com/tools/dev-tanod-tanod/build-ics-event.md
- `build_pptx_deck` — Execute — https://policylayer.com/tools/dev-tanod-tanod/build-pptx-deck.md
- `build_xlsx_workbook` — Execute — https://policylayer.com/tools/dev-tanod-tanod/build-xlsx-workbook.md
- `bulk_agent_index` — Execute — https://policylayer.com/tools/dev-tanod-tanod/bulk-agent-index.md
- `cron_next_runs` — Execute — https://policylayer.com/tools/dev-tanod-tanod/cron-next-runs.md
- `decode_calldata` — Execute — https://policylayer.com/tools/dev-tanod-tanod/decode-calldata.md
- `expand_rrule` — Execute — https://policylayer.com/tools/dev-tanod-tanod/expand-rrule.md
- `html_to_pdf` — Execute — https://policylayer.com/tools/dev-tanod-tanod/html-to-pdf.md
- `image_crop` — Execute — https://policylayer.com/tools/dev-tanod-tanod/image-crop.md
- `parse_ics` — Execute — https://policylayer.com/tools/dev-tanod-tanod/parse-ics.md
- `parse_phone_number` — Execute — https://policylayer.com/tools/dev-tanod-tanod/parse-phone-number.md
- `parse_rss_feed` — Execute — https://policylayer.com/tools/dev-tanod-tanod/parse-rss-feed.md
- `parse_sitemap` — Execute — https://policylayer.com/tools/dev-tanod-tanod/parse-sitemap.md
- `parse_url` — Execute — https://policylayer.com/tools/dev-tanod-tanod/parse-url.md
- `parse_user_agent` — Execute — https://policylayer.com/tools/dev-tanod-tanod/parse-user-agent.md
- `satellite_passes` — Execute — https://policylayer.com/tools/dev-tanod-tanod/satellite-passes.md
- `sec_financials` — Execute — https://policylayer.com/tools/dev-tanod-tanod/sec-financials.md
- `transcribe_audio` — Execute — https://policylayer.com/tools/dev-tanod-tanod/transcribe-audio.md
- `x402_well_known_file` — Execute — https://policylayer.com/tools/dev-tanod-tanod/x402-well-known-file.md
- `compare_stablecoin_transfer_fees` — Financial — https://policylayer.com/tools/dev-tanod-tanod/compare-stablecoin-transfer-fees.md
- `transfer_preflight` — Financial — https://policylayer.com/tools/dev-tanod-tanod/transfer-preflight.md
- `airport_distance` — Read — https://policylayer.com/tools/dev-tanod-tanod/airport-distance.md
- …and 277 more: https://policylayer.com/tools/dev-tanod-tanod.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=dev-tanod-tanod · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/dev-tanod-tanod