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Phocinae MCP

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by io.github.Phocinae

Local Phocinae decision-engine MCP stdio server: fail-closed approval gate + classify/route/score.

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The publisher's own command. Not a PlugMCP endpoint.

Local command
uvx phocinae-mcp==0.2.6
Provider
Claude Code
claude mcp add io.github.phocinae-phocinae-mcp -- uvx phocinae-mcp==0.2.6

Run in a terminal.

Claude Desktop
{
  "mcpServers": {
    "io.github.phocinae-phocinae-mcp": {
      "command": "uvx",
      "args": [
        "phocinae-mcp==0.2.6"
      ]
    }
  }
}

claude_desktop_config.json

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A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

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Local Phocinae decision-engine MCP stdio server: fail-closed approval gate + classify/route/score.

phocinae-mcp

把斑海豹的命令审批门与 P0 推理协议暴露为 MCP 工具(gate / classify / route / score),接入只读 MCP 的编码代理。双代协议并存:现代面(2026-07-28,含 server/discover、MRTR 交互、Streamable HTTP)与 2024-11-05 旧客户端兼容。

斑海豹生态的 MCP server:把斑海豹的命令审批与推理能力以 4 个工具暴露给 MCP 客户端。纯标准库(Python ≥ 3.8,零第三方依赖),支持 stdio 与 Streamable HTTP 两种传输,MCP 2026-07-28 对齐并兼容 2024-11-05 旧客户端。

本仓库为本地增强版(基于 PyPI phocinae-mcp 0.1.1),仅用于本地开发与 协议对齐验证,不发布。

Install (local enhanced build)

git clone https://github.com/Phocinae/phocinae-mcp.git
cd phocinae-mcp
python3 -m pip install .
phocinae-mcp --help

This repository is a local enhanced build and is not the PyPI release; the registry entry and the package below refer to the same server contract.

工具

工具作用输入输出
gate判定 shell 命令能否执行command、cwd?、server?decision ∈ allow/deny/ask + layer/reason
classify把状态归入候选标签之一state、labels、server?choice(下标)+ label
route从候选工具中选最合适的一个state、tools、server?choice + tool
score按标准给状态打 2–10 分state、criteria、server?score + range

fail-closed:斑海豹 P0 服务(/v1/systemone)不可用、超时、应答异常时, gate 一律返回 deny(带原因),classify/route/score 返回 isError: true。

传输方式

stdio(默认)

python3 -m phocinae_mcp --server http://127.0.0.1:8155

MCP 客户端以子进程方式拉起,走 stdin/stdout 逐行 JSON-RPC 帧。 stdout 纯净性保证:stdout 只输出 JSON-RPC 帧;一切日志(启动、告警、 工具内部异常)只走 stderr(phocinae-mcp[level]: 前缀)。guard.py 导入期 的打印也被重定向到 stderr,不会污染协议通道。

Streamable HTTP(新增,2026-07-28)

python3 -m phocinae_mcp --transport http --host 127.0.0.1 --port 8255
# --port 0 → 随机端口(测试用);端口号打印在 stderr
  • 仅回环绑定:--host 只接受 127.0.0.1 / localhost / ::1, 其他地址直接拒绝启动(exit 2);
  • 端点 POST /mcp;通知 → 202 Accepted(空 body);请求 → 200 单对象 JSON;
  • 请求头强制(Server Validation):MCP-Protocol-Version 必带且须受 支持(否则 400 + -32020/-32022)、Mcp-Method 必带且等于 body 的 method(tools/call、resources/read 还必带 Mcp-Name 等于 name/uri),违者 400 -32020;Accept 未含 application/json / text/event-stream → 406;未知方法 → 404 -32601;GET/DELETE → 405(2026-07-28 已移除 GET 流与会话终结端点);
  • 无会话头(Mcp-Session-Id)、无 SSE 恢复缓冲——无状态服务,可任意重启。

环境变量:PHOCINAE_MCP_TRANSPORT=stdio|http、PHOCINAE_MCP_HTTP_PORT 可替代命令行开关。

协议对齐(2026-07-28)

双代并存,按请求逐条分派:

  • 带 params._meta(含 io.modelcontextprotocol/* 键)的请求、以及 server/discover、resources/* → 现代面;
  • initialize 握手、无 _meta 的请求 → 旧年代(2024-11-05 行为, 与原版 0.1.x 一致)。

现代面补足项:

项实现
server/discover必实现:supportedVersions、capabilities、_meta.serverInfo、instructions,ttlMs=3600000、cacheScope=public
_meta 校验逐请求必填 protocolVersion + clientCapabilities,缺失 → -32602;版本不支持 → -32022(data.supported/data.requested)
resultType一切结果携带(complete / input_required)
ttlMs/cacheScopediscover、tools/list、resources/*(静态内容,public 共享缓存)
多轮交互(MRTR)gate 返回 ask 且客户端声明 elicitation 能力时 → resultType=input_required + inputRequests.gate_confirmation(elicitation/create,form)+ requestState;回执 accept/decline/cancel → allow/deny/不授权;requestState 为 HMAC-SHA256 防篡改 + 10 分钟过期 + 请求指纹(tool+command)比对,篡改/过期自动重发交互
resourcesresources/list + resources/read 暴露审批策略全文 phocinae://policy/gate-approval(text/markdown,含 L0/L1/fail-closed 判定链路、阈值、ask 处理义务)
已移除方法现代面下 initialize/ping/shutdown/logging/setLevel/subscriptions/listen → -32601(data 附 supportedVersions)
工具 schema 收紧maxLength(command/state 20000、cwd 4096、server 2048、列表单项 2000)、minItems/maxItems(1–100)、enum(decision/layer)、outputSchema 全量声明(classify/route/score additionalProperties:false);服务端同步执行同口径校验(越限 → -32602)
description 重写四工具均按「何时使用 / 何时不使用」结构重写
日志全部走 stderr;_meta 里 io.modelcontextprotocol/logLevel 门控(info 起,MCP 级日志协议字段)

兼容性:旧客户端 initialize 握手返回 2024-11-05 能力;无 _meta 的 tools/list/tools/call 按旧年代应答(不报错)——对旧客户端零破坏。

运行

# stdio(默认)
python3 -m phocinae_mcp [--server http://127.0.0.1:8155] [--timeout 5]
    [--guard /path/to/guard.py] [--l1-enabled] [--model <name>]

# Streamable HTTP
python3 -m phocinae_mcp --transport http [--host 127.0.0.1] [--port 8255]

python3 -m phocinae_mcp --version

--guard:复用 phocinae-guard 的 guard.py(L0 确定性表 + L1 编排),自动 探测同级 ../phocinae-guard/guard.py;找不到则 gate 降级为纯 HTTP noul+score 两问(engine: "http:noul+score")。导入 guard 时不写 __pycache__(只读复用)。

测试

python3 tests/test_mcp.py    # stdio 双代全流程冒烟 → tests/mcp_smoke.txt
python3 tests/test_http.py   # Streamable HTTP 冒烟 → tests/http_smoke.txt
  • test_mcp.py:模拟 MCP 客户端,走 stdio 依次执行旧年代 initialize → notifications/initialized → ping → tools/list → tools/call 全工具矩阵(含失败分支)→ shutdown;现代年代 discover → tools/list → 全工具矩阵(gate allow/deny/ask、MRTR 接受/拒绝/取消/篡改、fail-closed、 schema 越限、-32602/-32022/-32601、resources)→ 通知。同时对 stdout 逐行审计(每行必须是 JSON-RPC 帧、日志零泄漏、无 traceback)。
  • test_http.py:HTTP 头校验矩阵(-32020/-32022/406/405/404/ 202)+ MRTR 全链路 + resources。
  • 两个测试共用 tests/mock_systemone.py(确定性 mock P0 服务,不跑模型)。

目录

phocinae_mcp/
├── server.py          主程序:双代分派、MRTR、CLI(stdio/http)
├── http_transport.py  Streamable HTTP(新增)
├── protocol.py        2026-07-28 共享件(新增):版本/错误码/_meta 校验/
│                      resultType/ttlMs/cacheScope/HMAC requestState/策略文本/日志门控
├── tools.py           四工具 + 收紧后的 schema(description 重写)
├── backend.py         斑海豹 P0 客户端(原版不动)
├── guard_bridge.py    guard.py 复用桥(+stdout 纯净性防护)
└── __init__.py / __main__.py
tests/
├── test_mcp.py        stdio 全流程冒烟 → mcp_smoke.txt
├── test_http.py       HTTP 冒烟 → http_smoke.txt
└── mock_systemone.py  确定性 mock P0 服务

安全声明(与斑海豹生态同口径)

  • gate 的 ask 结果要求集成方把命令与理由呈现给人工,未获明确批准 不得执行(现代面走 elicitation 交互,旧年代走结果文本);
  • 判定结果不构成任何法律责任承诺;fail-closed 是唯一默认;
  • 审批策略全文见资源 phocinae://policy/gate-approval(resources/read)。
How do I install Phocinae MCP?
Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.
Does Phocinae MCP need an API key?
No required environment variable is listed on this record.
What transport does Phocinae MCP use?
Phocinae MCP runs locally over stdio.
When was Phocinae MCP last checked?
Last checked 2026-10-16. Local Phocinae decision-engine MCP stdio server: fail-closed approval gate + classify/route/score.

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