GitHub Copilot API Proxy (ghc-api)

A Python Flask application that serves as a proxy server for GitHub Copilot API, providing OpenAI and Anthropic API compatibility with caching and monitoring capabilities.

Features

• OpenAI API Compatibility: /v1/chat/completions endpoint
• Anthropic API Compatibility: /v1/messages endpoint with automatic request/response translation
• Model Listing: /v1/models endpoint listing available models
• Model Name Mapping: Translate model names with exact and prefix-based matching
• Token Management: Automatic GitHub Copilot token refresh
• Vision Support: Handle image inputs and enable vision capabilities
• Memory Caching: Cache all requests and responses (up to 1000 entries)
• Web Dashboard: Real-time statistics and request browser
• Request Details: View full request/response bodies with JSON formatting
• Export/Import: Export and import request history as JSON Lines files
• Optional Request File Logging: Save completed requests to daily JSON Lines files
• Content Filtering: Remove or add content from system prompts and tool results
• Code Agent Manager UI: Install Codex/Claude/Copilot CLI and manage config sync from dashboard
• Code Agent Interaction: Web UI to create and interact with Claude Code, Codex, and Copilot CLI agents via the Agent Client Protocol (ACP)
• Config Sync: Sync Claude Code, Codex, and ghc-api config files with OneDrive
• Safe Backups: Auto backup overwritten config files as *.YYYYMMDD_HHMMSS.bak
• Machine Token Usage Logs: Periodic token usage JSONL per machine with cross-machine overview in dashboard

Installation

Install the package using pip:

pip install ghc-api

Or install from source:

pip install .

Usage

Start the server with the ghc-api command:

ghc-api

By default, the server will start on http://localhost:8313.

Command Line Options

• -p PORT or --port PORT: Specify the port to listen on (default: 8313)
• -a ADDRESS or --address ADDRESS: Specify the address to listen on (default: localhost)
• -c or --config: Generate a YAML config file in ~/.ghc-api/config.yaml
• -v or --version: Show version (for example ghc-api 1.0.15)
• --help: Show help message

Configuration

The application looks for a configuration file at ~/.ghc-api/config.yaml. You can generate this file using:

ghc-api --config

The config file contains:

# Server Settings
address: localhost
port: 8313
debug: false

# GitHub Copilot Account Type
# Options: "individual", "business", "enterprise"
account_type: individual

# Version settings (used to build request headers)
vscode_version: "1.93.0"
api_version: "2025-04-01"
copilot_version: "0.26.7"

# Model Name Mappings
model_mappings:
  # Exact match mappings
  exact:
    opus: claude-opus-4.5
    sonnet: claude-sonnet-4.5
    haiku: claude-haiku-4.5
  # Prefix match mappings
  prefix:
    claude-sonnet-4-: claude-sonnet-4
    claude-opus-4.5-: claude-opus-4.5

# Content Filtering
system_prompt_remove: []    # Strings to remove from system prompts
system_prompt_add: []       # Strings to append to system prompts
tool_result_suffix_remove: [] # Strings to remove from end of tool results

# Optional request persistence
save_request_to_file: false # If true, save completed requests to requests/YYYY-MM-DD.jl

# Optional OneDrive access gate
disable_onedrive_access: true # If true, skip all OneDrive detection/sync/shared reads

Token Management

The application follows this priority for getting the GitHub token:

1. GITHUB_TOKEN environment variable
2. Token file at ~/.ghc-api/github_token.txt
3. Interactive GitHub Device Flow authentication

Config Sync and OneDrive

ghc-api can manage and sync these files:

• Claude Code: ~/.claude/settings.json
• Codex: ~/.codex/config.toml
• ghc-api: ~/.ghc-api/config.yaml (or %APPDATA%/ghc-api/config.yaml on Windows)

OneDrive detection priority:

1. ~/OneDrive - *
2. ~/OneDrive
3. In WSL: /mnt/c/Users/<username>/OneDrive - * then /mnt/c/Users/<username>/OneDrive

To disable all OneDrive-dependent operations, set disable_onedrive_access: true in config.yaml. When enabled, ghc-api skips OneDrive detection, config sync actions, and shared OneDrive hash reads.

Sync target folder:

• .ghc-api/configSync under detected OneDrive root

Machine folder:

• .ghc-api/agents/{hostname}_{os} where os is Win, Linux, or WSL

Hash files:

• .ghc-api/configSync/config.sha1
• .ghc-api/agents/{hostname}_{os}/ghc-api/config.sha1

Hashes are recalculated when local config file timestamp is newer than the hash file. On startup, ghc-api checks synced files and prints config differences to stdout (and UI indicator if different).

Token Usage Logging

Every 5 minutes, ghc-api writes token usage delta (if non-zero) to:

• OneDrive mode: .ghc-api/agents/{hostname}_{os}/token_usage.jl
• Fallback when OneDrive is unavailable: ~/.ghc-api/token_usage.jl

Also flushes pending usage on shutdown (Ctrl+C/termination/normal exit).

Each JSONL line includes:

• timestamp (unix seconds)
• models list with:
  • model
  • request_count
  • input_tokens
  • output_tokens
  • total_tokens

Request File Logging

When save_request_to_file: true, ghc-api appends each completed request to:

• <ghc-api config dir>/requests/YYYY-MM-DD.jl

The saved .jl line format is the same as dashboard export (/api/requests/export) and can be imported by dashboard import (/api/requests/import).

Code Agent Interaction

The Code Agent page (/agent) provides a web interface for interacting with AI coding agents via the Agent Client Protocol (ACP). Supported agents:

Agent	Package	Install
Claude Code	@agentclientprotocol/claude-agent-acp	npm install -g @agentclientprotocol/claude-agent-acp
Codex	codex-acp	Download from GitHub releases
Copilot CLI	@github/copilot	npm install -g @github/copilot

Agent binaries are resolved in order: environment variable override (CLAUDE_ACP_BINARY, CODEX_ACP_BINARY, COPILOT_CLI_BINARY), then PATH lookup, then npm global packages.

Session data is stored in:

• OneDrive mode: .ghc-api/agents/{hostname}_{os}/sessions/
• Fallback: ~/.ghc-api/sessions/ (or %APPDATA%/ghc-api/sessions/ on Windows)

Recent working directories are persisted to workdirs.json in the same location. Sessions from other machines are browsable via the machine selector dropdown when OneDrive is enabled.

API Endpoints

OpenAI Compatible

• POST /v1/chat/completions - Chat completions
• POST /chat/completions - Chat completions (without v1 prefix)
• GET /v1/models - List available models
• GET /models - List available models (without v1 prefix)

Anthropic Compatible

• POST /v1/messages - Messages API (Anthropic format)

Dashboard & Monitoring

• GET / - Web dashboard with statistics
• GET /requests - Request browser page
• GET /api/runtime-config - Read in-memory runtime config
• POST /api/runtime-config - Update in-memory runtime config (no file write)
• GET /api/stats - JSON statistics endpoint
• GET /api/requests - Paginated list of requests
• GET /api/requests/search - Full-text search in request/response bodies
• GET /api/requests/export - Export all requests as JSON Lines file
• POST /api/requests/import - Import requests from JSON Lines file
• GET /api/request/<id> - Individual request details
• GET /api/request/<id>/request-body - Request body only
• GET /api/request/<id>/response-body - Response body only
• GET /api/config-manager/status - Config manager status and diff info
• POST /api/config-manager/install-tools - Install Codex/Claude/Copilot CLI
• POST /api/config-manager/sync-to-onedrive - Sync local config to OneDrive
• POST /api/config-manager/sync-from-onedrive - Copy OneDrive config to local machine with backups
• GET /api/config-manager/token-usage?range=all|day|week|month - Cross-machine token usage overview
• GET /api/config-manager/config-hashes - Config hash overview for shared OneDrive and each machine (with create time)

Code Agent (ACP)

• GET /agent - Code agent interaction page
• POST /api/agent/sessions - Create a new agent session
• GET /api/agent/sessions - List sessions (paginated, filterable by machine)
• GET /api/agent/sessions/<id> - Get session detail with message history
• POST /api/agent/sessions/<id>/prompt - Send a prompt (returns SSE stream)
• POST /api/agent/sessions/<id>/cancel - Cancel the current prompt
• DELETE /api/agent/sessions/<id> - Terminate a session
• GET /api/agent/machines - List available machine names
• GET /api/agent/workdirs - List recent working directories

Example Usage

With OpenAI Python SDK

from openai import OpenAI

client = OpenAI(
    base_url="http://localhost:8313/v1",
    api_key="not-needed"  # Token is managed by the proxy
)

response = client.chat.completions.create(
    model="gpt-4o",
    messages=[{"role": "user", "content": "Hello!"}]
)
print(response.choices[0].message.content)

With Anthropic Python SDK

import anthropic

client = anthropic.Anthropic(
    base_url="http://localhost:8313",
    api_key="not-needed"  # Token is managed by the proxy
)

message = client.messages.create(
    model="claude-sonnet-4",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello!"}]
)
print(message.content[0].text)

With cURL

# Chat completions
curl http://localhost:8313/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-4o",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

# List models
curl http://localhost:8313/v1/models

Dashboard

Access the web dashboard at http://localhost:8313/ to:

• View overall statistics (total requests, data transfer)
• See per-model usage statistics
• See per-endpoint analytics
• Browse recent requests
• View detailed request/response bodies
• Use Code Agent Manager to:
  • Install code-agent CLIs
  • Sync config files to/from OneDrive
  • See config mismatch alerts
  • View token usage overview by machine/model with time-range and machine filters
  • View config hash overview by machine and shared OneDrive hash with create times
• Use Code Agent page (/agent) to:
  • Create interactive sessions with Claude Code, Codex, or Copilot CLI
  • Send prompts and receive real-time streaming responses (text, tool calls, thinking)
  • Toggle verbose mode for detailed tool inputs/outputs, stdout/stderr, and token usage
  • Browse sessions across machines via OneDrive
  • Resume viewing past session history

Architecture

• Modular Design: Organized into separate modules for maintainability
  • main.py - Entry point and configuration loading
  • app.py - Flask application factory
  • config.py - Configuration constants and model mappings
  • cache.py - Request caching and statistics
  • translator.py - OpenAI/Anthropic format translation
  • streaming.py - Streaming response handling
  • token_manager.py - GitHub token management
  • routes/ - API endpoint handlers (openai, anthropic, dashboard, agent)
  • acp/ - Agent Client Protocol implementation (JSON-RPC 2.0 over subprocess stdio)
• Thread-Safe Caching: Uses threading locks for concurrent access
• Memory-Based Storage: No external database dependencies
• RESTful API Design: Follows REST conventions

License

MIT License