# Circuit Sim Lab (電路模擬實驗室) (remote · circuit-sim.enscon.ai)

PCB calculators: trace impedance, crosstalk, diff skew, crystal load cap, Vout tolerance, inrush.

- Trust score: 70/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `circuit-sim.enscon.ai`: 70/100 (this document), [markdown](https://verifymcp.io/servers/ai-enscon-circuit-sim/circuit-sim.md), [page](https://verifymcp.io/servers/ai-enscon-circuit-sim/circuit-sim)

## Channel facts

- Endpoint: `https://circuit-sim.enscon.ai/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## 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**: 57/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 6 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - 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**: 52/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 1903 tokens (~317/item across 6 items; 6 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 80/100
  - Stability observed for 24 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 6 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 7 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 Circuit Sim Lab (電路模擬實驗室) MCP server?

Circuit Sim Lab (電路模擬實驗室) is a hosted endpoint at https://circuit-sim.enscon.ai/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 ai-enscon-circuit-sim 'https://circuit-sim.enscon.ai/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "ai-enscon-circuit-sim": {
      "url": "https://circuit-sim.enscon.ai/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "ai-enscon-circuit-sim": {
      "type": "http",
      "url": "https://circuit-sim.enscon.ai/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.ai-enscon-circuit-sim]
url = "https://circuit-sim.enscon.ai/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "ai-enscon-circuit-sim": {
      "type": "remote",
      "url": "https://circuit-sim.enscon.ai/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add ai-enscon-circuit-sim --url 'https://circuit-sim.enscon.ai/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  ai-enscon-circuit-sim:
    url: "https://circuit-sim.enscon.ai/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "ai-enscon-circuit-sim": {
      "Transport": "http",
      "Url": "https://circuit-sim.enscon.ai/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add ai-enscon-circuit-sim -t streamable-http -u 'https://circuit-sim.enscon.ai/mcp'
```

### Other

```json
{
  "mcpServers": {
    "ai-enscon-circuit-sim": {
      "type": "http",
      "url": "https://circuit-sim.enscon.ai/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 70, +1)

No change was recorded against any check on this day. Stability & Change Management went from 77 to 80. That category is still filling its 30-day observation window: 23 days of observed history at the previous scan, 24 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-03 (score 69, +1)

No change was recorded against any check on this day. Stability & Change Management went from 70 to 73. That category is still filling its 30-day observation window: 21 days of observed history at the previous scan, 22 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 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-29 (score 67, +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.

### 2026-10-27 (score 66, +1)

No change was recorded against any check on this day. Stability & Change Management went from 47 to 50. That category is still filling its 30-day observation window: 14 days of observed history at the previous scan, 15 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-25 (score 65, +1)

No change was recorded against any check on this day. Stability & Change Management went from 40 to 43. That category is still filling its 30-day observation window: 12 days of observed history at the previous scan, 13 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-23 (score 64, +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.

### 2026-10-21 (score 63, +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.

## MCP tools (6)

### `impedance` (~282 tokens)

差動／單端阻抗（微帶線、帶狀線）

用 2D 電場數值解算微帶線或帶狀線的差動阻抗（Zdiff、Zcomm、奇／偶模）或單端阻抗（Z0），含銅厚。回傳附適用範圍。

Input parameters:

- `er` (number): 板材介電常數 εr（帶狀線上下用同一個）
- `h` (number): 微帶線：線到參考層的介質厚度（kind=ms）（mm）
- `ha` (number): 帶狀線：線頂到上參考層（kind=sl）（mm）
- `hb` (number): 帶狀線：線底到下參考層（kind=sl）（mm）
- `kind` (string): ms＝微帶線（外層）、sl＝帶狀線（內層，上下都有參考層）
- `mode` (string): diff＝差動對、single＝單線
- `s` (number): 差動對的線間距（單線 single 模式不用）（mm）
- `t` (number): 銅厚（35 µm＝1 oz）（mm）
- `w` (number): 線寬（mm）

### `crosstalk` (~314 tokens)

串音（解析式：近端／遠端係數）

兩條耦合線的串音：偶／奇模阻抗用 2D 電場數值解，再算近端串音係數 kb、飽和比例、遠端串音係數。只回傳解析式的部分（不含工具頁的 ngspice 時域波形）。

Input parameters:

- `er` (number): 板材介電常數 εr（帶狀線上下用同一個）
- `h` (number): 微帶線：線到參考層的介質厚度（kind=ms）（mm）
- `ha` (number): 帶狀線：線頂到上參考層（kind=sl）（mm）
- `hb` (number): 帶狀線：線底到下參考層（kind=sl）（mm）
- `kind` (string): ms＝微帶線（外層）、sl＝帶狀線（內層，上下都有參考層）
- `len` (number): 並行長度（mm）
- `s` (number): 差動對的線間距（單線 single 模式不用）（mm）
- `t` (number): 銅厚（35 µm＝1 oz）（mm）
- `tr` (number): 攻擊線的上升時間（10–90%）（ps）
- `w` (number): 線寬（mm）

### `diff_skew` (~258 tokens)

差動對對內 skew

兩條線的長度差換成時間差（ps），對照介面的上限：USB3／PCIe 用業界經驗值 5 mil（非規範原文，出處見適用範圍）；DisplayPort／HDMI 沒有預設，請用 lim 填晶片廠或規範給的值。

Input parameters:

- `ee` (number): 有效介電常數 εeff
- `iface` (string): 介面：none／usb3／pcie／dp／hdmi
- `lim` (number): 對內長度差上限（ps）。0 或不帶＝用介面預設（USB3／PCIe 業界經驗值 5 mil）；DP／HDMI 沒有預設，請填晶片廠或規範給的值，沒帶時 limit_ps 回 null（ps）
- `ln` (number): N 線長度（mm）
- `lp` (number): P 線長度（mm）
- `rate` (number): 資料速率（UI＝1000÷速率 ps）（Gbps）

### `xtal_load_cap` (~375 tokens)

晶振負載電容與增益餘裕

外掛電容 C1、C2 與雜散電容算出實際負載電容 CL、頻率偏移 ppm、振盪增益餘裕、驅動功率，並給出剛好對上規格 CL 的電容值。

Input parameters:

- `c0` (number): 並聯電容 C0（pF）
- `c1` (number): 外掛電容 C1。2026-10-12 起預設 26 pF（原 30 pF），配合 cs 預設 5 pF 讓 CL＝18 pF（pF）
- `c2` (number): 外掛電容 C2。2026-10-12 起預設 26 pF（原 30 pF），配合 cs 預設 5 pF 讓 CL＝18 pF（pF）
- `cls` (number): 晶振規格的負載電容 CL（pF）
- `cm` (number): 動態電容 Cm（fF）
- `cs` (number): 雜散電容（腳位＋走線）。2026-10-12 起預設 5 pF（原 3 pF），出處 ST AN2867／TI SLLA122（pF）
- `esr` (number): 等效串聯電阻 ESR（最大值）（Ω）
- `f` (number): 晶振頻率（MHz）
- `gm` (number): 晶片振盪器跨導 gm（mA/V）
- `vpp` (number): C1 那端的峰對峰電壓（算驅動功率用）（V）

### `output_voltage_tolerance` (~326 tokens)

輸出電壓公差（回授分壓）

回授電阻分壓的輸出電壓：最壞情況（每項取上下限的所有組合）、RSS 統計；可選蒙地卡羅超規比例。

Input parameters:

- `dist` (string): 蒙地卡羅的誤差分布
- `dt` (number): 溫差（°C）
- `ifb` (number): 回授腳偏壓電流（典型）（nA）
- `monte_carlo` (boolean): true＝多跑蒙地卡羅（固定亂數種子，可重現）
- `n` (integer): 蒙地卡羅次數
- `r1` (number): 上電阻 R1（kΩ）
- `r2` (number): 下電阻 R2（kΩ）
- `tc` (number): 電阻溫漂（ppm/°C）
- `tifb` (number): 回授腳偏壓電流（最大偏離）（nA）
- `tr` (number): 電阻公差 ±（%）
- `track` (integer): 1＝兩顆電阻溫漂同向（互相抵消）
- `tref` (number): VREF 精度 ±（%）
- `vmax` (number): 允許的輸出上限（V）
- `vmin` (number): 允許的輸出下限（V）
- `vref` (number): 參考電壓 VREF（V）

### `inrush_current` (~273 tokens)

湧入電流（負載開關控速／直接接電容）

負載開關控速上升時的充電電流、峰值電流、能量與脈衝 I²t（mode=slew），或電容直接接電源時的串聯 R-L-C 步階電流（mode=direct）。

Input parameters:

- `cout` (number): 輸出電容（µF）
- `ct` (number): CT 腳電容（ctsel≠none 時用）（pF）
- `ctsel` (string): 用 CT 腳電容決定上升時間：none／t918／t965
- `esr` (number): 電容 ESR（direct）（mΩ）
- `lh` (number): 線路電感（direct）（nH）
- `mode` (string): slew＝負載開關控速、direct＝直接接電容
- `rl` (number): 負載電阻（0＝不接）（Ω）
- `rs` (number): 線路＋電源內阻（direct）（mΩ）
- `tr` (number): 輸出上升時間（10–90%，ctsel=none 時用）（µs）
- `vin` (number): 輸入電壓（V）

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/ai-enscon-circuit-sim/circuit-sim#diagnostics

## Score history

- 2026-11-05: 70
- 2026-11-04: 69
- 2026-11-03: 69
- 2026-11-02: 68
- 2026-11-01: 68
- 2026-10-31: 67
- 2026-10-30: 67
- 2026-10-29: 67
- 2026-10-28: 66
- 2026-10-27: 66
- 2026-10-26: 65
- 2026-10-25: 65
- 2026-10-24: 64
- 2026-10-23: 64
- 2026-10-22: 63
- 2026-10-21: 63
- 2026-10-20: 62
- 2026-10-19: 62
- 2026-10-18: 61
- 2026-10-17: 61
- 2026-10-16: 60
- 2026-10-15: 60
- 2026-10-14: 60
- 2026-10-13: 59
- 2026-10-12: 59

## Common questions

### What is the Circuit Sim Lab (電路模擬實驗室) MCP server?

Circuit Sim Lab (電路模擬實驗室) is an MCP server listed in the public MCP registry as ai.enscon/circuit-sim. PCB calculators: trace impedance, crosstalk, diff skew, crystal load cap, Vout tolerance, inrush. This page covers its hosted endpoint (https://circuit-sim.enscon.ai/mcp).

### Is the Circuit Sim Lab (電路模擬實驗室) MCP server safe to use?

Circuit Sim Lab (電路模擬實驗室) scores 70 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 Circuit Sim Lab (電路模擬實驗室) MCP server expose?

Circuit Sim Lab (電路模擬實驗室) exposes 6 tools: impedance, crosstalk, diff_skew, xtal_load_cap, output_voltage_tolerance, inrush_current. Their descriptions and schemas cost roughly 1,828 tokens of context every time the server is loaded.

### Does the Circuit Sim Lab (電路模擬實驗室) MCP server require authentication?

No. We connected to Circuit Sim Lab (電路模擬實驗室) without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Circuit Sim Lab (電路模擬實驗室) MCP server still maintained?

Circuit Sim Lab (電路模擬實驗室) 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://circuit-sim.enscon.ai/mcp
- Authorisation metadata: https://circuit-sim.enscon.ai/.well-known/oauth-protected-resource/mcp
- Website: https://circuit-sim.enscon.ai/docs/api
- Changelog RSS feed: https://verifymcp.io/servers/ai-enscon-circuit-sim/circuit-sim.xml
- Changelog JSON feed: https://verifymcp.io/servers/ai-enscon-circuit-sim/circuit-sim.json
- HTML version of this page: https://verifymcp.io/servers/ai-enscon-circuit-sim/circuit-sim