# sysketch (remote · sysketch.vercel.app)

Polished system design diagrams (SVG/PNG) from a tiny YAML spec, ~18x fewer tokens than raw SVG.

- Trust score: 82/100 (high trust)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `sysketch.vercel.app`: 82/100 (this document), [markdown](https://verifymcp.io/servers/tonys-coding-sysketch/sysketch.md), [page](https://verifymcp.io/servers/tonys-coding-sysketch/sysketch)
- npm · `sysketch-mcp`: 77/100, [markdown](https://verifymcp.io/servers/tonys-coding-sysketch/sysketch-mcp.md), [page](https://verifymcp.io/servers/tonys-coding-sysketch/sysketch-mcp)

## Channel facts

- Endpoint: `https://sysketch.vercel.app/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.5.0`

## 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**: 80/100
  - 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.
  - The HSTS (Strict-Transport-Security) header is present.
  - 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**: 76/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 481 tokens (~160/item across 3 items; 2 tools + 1 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 63/100
  - Stability observed for 19 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 92/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 75% 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 2 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 supported MCP spec version (2025-11-25); the latest is 2026-07-28.
  - Supports UI / widget rendering.

## Install

### How do I install the sysketch MCP server?

sysketch is a hosted endpoint at https://sysketch.vercel.app/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 tonys-coding-sysketch 'https://sysketch.vercel.app/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "tonys-coding-sysketch": {
      "url": "https://sysketch.vercel.app/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "tonys-coding-sysketch": {
      "type": "http",
      "url": "https://sysketch.vercel.app/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.tonys-coding-sysketch]
url = "https://sysketch.vercel.app/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "tonys-coding-sysketch": {
      "type": "remote",
      "url": "https://sysketch.vercel.app/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add tonys-coding-sysketch --url 'https://sysketch.vercel.app/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  tonys-coding-sysketch:
    url: "https://sysketch.vercel.app/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "tonys-coding-sysketch": {
      "Transport": "http",
      "Url": "https://sysketch.vercel.app/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add tonys-coding-sysketch -t streamable-http -u 'https://sysketch.vercel.app/mcp'
```

### Other

```json
{
  "mcpServers": {
    "tonys-coding-sysketch": {
      "type": "http",
      "url": "https://sysketch.vercel.app/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.

### 2026-11-05 (score 82, +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.

### 2026-11-03 (score 81, +1)

No change was recorded against any check on this day. Stability & Change Management went from 53 to 57. That category is still filling its 30-day observation window: 16 days of observed history at the previous scan, 17 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-31 (score 80, +1)

No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-30 (score 79, 0)

- [security] Tool “render_diagram” rewrote its description, which is the text the model reads
- [functional regression] Schema quality: 138 → 160

### 2026-10-28 (score 79, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-26 (score 78, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-24 (score 77, +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.

### 2026-10-22 (score 76, +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.

## MCP tools (2)

### `render_diagram` (~387 tokens)

Draw a system design diagram

Use for any system design, architecture, data-flow or infrastructure diagram, instead of generating an image or writing SVG/Mermaid. Renders a tiny YAML spec; returns PNG/SVG links and a small preview.
Spec keys: title, type (sequence: message timeline), theme (sketch|graphite|blueprint|midnight|classic), direction (omit: auto-fit; right|down only if asked), steps (false hides numbers), legend (true lists steps),
nodes {id: "icon | Label | subtitle"}, groups {Label: [ids or group labels to nest]}, maps {Group Label or world-map node id: world | {pins: [us-east, eu-west, "HQ @ -0.1 51.5"]}} (map backdrop, or a big map card when a node uses the icon world-map), edges ["a > b > c | label", "a ..> b" dashed, "a <> b" two-way, "a => b" thick, "a -- b" line, "a > b [red]" color].
Ids that are icon names/aliases (client, lb, api, db, cache, redis, kafka, s3, cdn...) need no nodes entry.
Arrows are numbered automatically in the order listed; don't number labels.
Product names (stripe, postgres, s3, aks, bigquery... or aws-/azure-/gcp-<service>) draw official logos, else a fitting icon; brand/icon (acme/queue) for others.
Give the user the PNG link; don't generate another image of the diagram. To edit, call again with the whole updated spec.

Input parameters:

- `preview` (boolean): Include a small preview image (default true; ~1k tokens)
- `spec` (string, required): YAML spec text
- `theme` (string)

### `list_icons` (~36 tokens)

List icons and logos

List sysketch icon names and aliases, or search the available product logos.

Input parameters:

- `logos` (string): Search product logos by name

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/tonys-coding-sysketch/sysketch#diagnostics

## Score history

- 2026-11-05: 82
- 2026-11-04: 81
- 2026-11-03: 81
- 2026-11-02: 80
- 2026-11-01: 80
- 2026-10-31: 80
- 2026-10-30: 79
- 2026-10-29: 79
- 2026-10-28: 79
- 2026-10-27: 78
- 2026-10-26: 78
- 2026-10-25: 77
- 2026-10-24: 77
- 2026-10-23: 76
- 2026-10-22: 76
- 2026-10-21: 75
- 2026-10-20: 75
- 2026-10-19: 75
- 2026-10-18: 74
- 2026-10-17: 74

## Common questions

### What is the sysketch MCP server?

sysketch is an MCP server listed in the public MCP registry as io.github.Tonys-Coding/sysketch. Polished system design diagrams (SVG/PNG) from a tiny YAML spec, ~18x fewer tokens than raw SVG. This page covers its hosted endpoint (https://sysketch.vercel.app/mcp).

### Is the sysketch MCP server safe to use?

sysketch scores 82 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 sysketch MCP server expose?

sysketch exposes 2 tools: render_diagram, list_icons. Their descriptions and schemas cost roughly 423 tokens of context every time the server is loaded.

### Does the sysketch MCP server require authentication?

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

### Is the sysketch MCP server still maintained?

sysketch 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://sysketch.vercel.app/mcp
- Repository: https://github.com/Tonys-Coding/sysketch
- Website: https://sysketch.vercel.app/
- Changelog RSS feed: https://verifymcp.io/servers/tonys-coding-sysketch/sysketch.xml
- Changelog JSON feed: https://verifymcp.io/servers/tonys-coding-sysketch/sysketch.json
- HTML version of this page: https://verifymcp.io/servers/tonys-coding-sysketch/sysketch