A software development kit for building applications that use GitHub Copilot programmatically. It supports Node.js, Python, Go, and .NET, and connects applications to the Copilot command-line tool through JSON-RPC.

Embedding Copilot in applications, managing sessions, adding tools and hooks, connecting MCP servers, streaming responses, and building custom agents across four programming languages.

It removes the need to control Copilot only through its interactive command line when building integrations. It also provides documented support for sessions, custom tools, streaming, hooks, MCP servers, and deployment.

How Jah-yee/diagrams-mcp-server configures Claude Code and Codex

Reuse

Borrowing it

Nothing to install: this file belongs to Jah-yee/diagrams-mcp-server. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/Jah-yee/diagrams-mcp-server/main/.agents/skills/copilot-sdk/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/Jah-yee/diagrams-mcp-server

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/jah-yee/diagrams-mcp-server/copilot-sdk/github.svg)](https://agentmods.dev/skills/jah-yee/diagrams-mcp-server/copilot-sdk)

Your own site

<a href="https://agentmods.dev/skills/jah-yee/diagrams-mcp-server/copilot-sdk"><img src="https://agentmods.dev/badge/skills/jah-yee/diagrams-mcp-server/copilot-sdk/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/jah-yee/diagrams-mcp-server/copilot-sdk"><img src="https://agentmods.dev/badge/skills/jah-yee/diagrams-mcp-server/copilot-sdk.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 92 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 6,916 The whole file, excluding the scripts and references it only reads on demand.

Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00092	$0.06916
Opus 5.5	$0.00037	$0.02766
Sonnet 5.5	$0.00018	$0.01383
Haiku 4.5	$0.00009	$0.00692

Measured 2mo ago against content hash 9bec8025d0cc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

copilot-sdk scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Unrestricted tool accessmediumExcessive agency

A wildcard tool grant or "run any command" leaves no least-privilege boundary at all.

tools: ["*"],

.agents/skills/copilot-sdk/SKILL.md · 905 lines

How it starts

The opening of the file, as written. The whole thing — 905 lines — stays where its author put it; the contents beside it link to each section on GitHub.

GitHub Copilot SDK

Build applications that programmatically interact with GitHub Copilot. The SDK wraps the Copilot CLI via JSON-RPC, providing session management, custom tools, hooks, MCP server integration, and streaming across Node.js, Python, Go, and .NET.

Prerequisites

GitHub Copilot CLI installed and authenticated (copilot --version)
GitHub Copilot subscription (Individual, Business, or Enterprise) — not required for BYOK
Runtime: Node.js 18+ / Python 3.8+ / Go 1.21+ / .NET 8.0+

Installation

Language	Package	Install
Node.js	`@github/copilot-sdk`	`npm install @github/copilot-sdk`
Python	`github-copilot-sdk`	`pip install github-copilot-sdk`
Go	`github.com/github/copilot-sdk/go`	`go get github.com/github/copilot-sdk/go`
.NET	`GitHub.Copilot.SDK`	`dotnet add package GitHub.Copilot.SDK`

Architecture

The SDK communicates with the Copilot CLI via JSON-RPC over stdio (default) or TCP. The CLI manages model calls, tool execution, session state, and MCP server lifecycle.

Your App → SDK Client → [stdio/TCP] → Copilot CLI → Model Provider
                                          ↕
                                     MCP Servers

Transport modes:

Mode	Description	Use Case
Stdio (default)	CLI as subprocess via pipes	Local dev, single process
TCP	CLI as network server	Multi-client, backend services

Core Pattern: Client → Session → Message

All SDK usage follows: create a client, create a session, send messages.

Node.js / TypeScript

import { CopilotClient } from "@github/copilot-sdk";

const client = new CopilotClient();
const session = await client.createSession({ model: "gpt-4.1" });

const response = await session.sendAndWait({ prompt: "What is 2 + 2?" });
console.log(response?.data.content);

await client.stop();

Python

import asyncio
from copilot import CopilotClient

async def main():
    client = CopilotClient()
    await client.start()
    session = await client.create_session({"model": "gpt-4.1"})
    response = await session.send_and_wait({"prompt": "What is 2 + 2?"})
    print(response.data.content)
    await client.stop()

asyncio.run(main())

Read the full file on GitHub · 905 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

references/acceptance-criteria.md 5.0 KB

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 905 lines · 92 tokens per session scan B 9bec8025d0cc

Subscribe to this mod's changes

copilot-sdk is a skill published in the GitHub repository Jah-yee/diagrams-mcp-server (0 stars, last pushed 8mo ago), licensed MIT. It adds 92 tokens to every session and 6,916 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it B with 1 finding (unrestricted tool access). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Building agents

copilot-sdk next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
copilot-sdkJah-yee/diagrams-mcp-server	Skill	0	8mo ago	MIT	B	92	Claude Code, Codex
imagegenopenai/codex	Skill	133k	yesterday	Apache-2.0	A	113	Codex
playwright-climicrosoft/playwright	Skill	99k	yesterday	Apache-2.0	A	19	Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	4d ago	MIT	A	200	Claude Code, Codex
systematic-debuggingobra/superpowers	Skill	313k	3d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	103	Claude Code

diagrams-mcp-server: Skill for Claude Code