# Circuit Sim Lab (電路模擬實驗室)

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

- name: ai.enscon/circuit-sim
- version: 1.0.0
- connection class: R1 (autonomous)
- trust: 83/100 flags: no-repository
- quality: 79/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/ai.enscon%2Fcircuit-sim
- tools: https://api.protogrid.dev/v1/servers/ai.enscon%2Fcircuit-sim/tools

**An agent can connect on its own if it already holds `CIRCUIT_SIM_TOKEN`.** Remote endpoint behind a static API key or header. The registry never sees the value; the agent fills the placeholder.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "circuit-sim": {
      "type": "http",
      "url": "https://circuit-sim.enscon.ai/mcp",
      "headers": {
        "Authorization": "Bearer ${CIRCUIT_SIM_TOKEN}"
      }
    }
  }
}
```

Placeholders to fill: `${CIRCUIT_SIM_TOKEN}`.

## Trust

- hygiene: 80
- liveness: 100
- freshness: 100
- provenance: 55
- drivers: +dns-namespace +website +reachable +uptime-100% +updated-10d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 79/100 (good)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-06-18; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 71 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- fail `tools.annotations`: no tool declares readOnlyHint or destructiveHint, so clients cannot tell safe calls from risky ones
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: impedance (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); crosstalk (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); diff_skew (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); …
- pass `tools.token_cost`: about 1,764 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 100 (weight 15)

- pass `stability.changes`: 3 tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 6, about 1,764 tokens to load them all
- tool set hash: 0e53fb07c9569d97db5deb657258d9c8
- tools last changed: 2026-10-13T03:02:44.659Z
- badge: [![protogrid quality](https://protogrid.dev/badge/ai.enscon/circuit-sim.svg)](https://protogrid.dev/servers/ai.enscon/circuit-sim)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

- 2026-10-13 `xtal_load_cap` changed (inputSchema)
- 2026-10-13 `diff_skew` changed (description, inputSchema)
  - before: 兩條線的長度差換成時間差（ps），對照介面規範的限制（USB3／PCIe／DisplayPort／HDMI，限制值附原廠文件出處）。
  - after: 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。
- 2026-10-12 `xtal_load_cap` changed (inputSchema)

Full history: https://api.protogrid.dev/v1/servers/ai.enscon%2Fcircuit-sim/changes

## Remotes

- https://circuit-sim.enscon.ai/mcp (streamable-http, auth api_key ${CIRCUIT_SIM_TOKEN}, reachable true, uptime30d 1)

## Packages

_none_

## Tools (6)

- `crosstalk`: 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）。
- `diff_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。
- `impedance`: 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。
- `inrush_current`: 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）。
- `output_voltage_tolerance`: 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。
- `xtal_load_cap`: 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。