@ai-sensei/claude-code-augmentor



> This project is sponsored by Z.ai, supporting us with their GLM CODING PLAN.
> GLM CODING PLAN is a subscription service designed for AI coding, starting at just $3/month. It provides access to their flagship GLM-4.7 model across 10+ popular AI coding tools (Claude Code, Cline, Roo Code, etc.), offering developers top-tier, fast, and stable coding experiences.
> Get 10% OFF GLM CODING PLAN：https://z.ai/subscribe?ic=8JVLJQFSKB

> A powerful tool to route Claude Code requests to different models and customize any request.


✨ Features

- Model Routing: Route requests to different models based on your needs (e.g., background tasks, thinking, long context).
- Multi-Provider Support: Supports various model providers like OpenRouter, DeepSeek, Ollama, Gemini, Volcengine, and SiliconFlow.
- Request/Response Transformation: Customize requests and responses for different providers using transformers.
- Dynamic Model Switching: Switch models on-the-fly within Claude Code using the /model command.
- CLI Model Management: Manage models and providers directly from the terminal with ccr model.
- GitHub Actions Integration: Trigger Claude Code tasks in your GitHub workflows.
- Plugin System: Extend functionality with custom transformers.
- Request Augmentation: Intercept Claude Code requests and augment them with custom system prompts, instructions, and context before forwarding to OpenRouter.

🚀 Getting Started

$3

First, ensure you have Claude Code installed:

``shell
npm install -g @anthropic-ai/claude-code
`

Then, install Claude Code Router:

`shell
npm install -g @musistudio/claude-code-router
`

$3

Create and configure your ~/.claude-code-router/config.json file. For more details, you can refer to config.example.json.

The config.json file has several key sections:

- PROXY_URL (optional): You can set a proxy for API requests, for example: "PROXY_URL": "http://127.0.0.1:7890".
- LOG (optional): You can enable logging by setting it to true. When set to false, no log files will be created. Default is true.
- LOG_LEVEL (optional): Set the logging level. Available options are: "fatal", "error", "warn", "info", "debug", "trace". Default is "debug".
- Logging Systems: The Claude Code Router uses two separate logging systems:
- Server-level logs: HTTP requests, API calls, and server events are logged using pino in the ~/.claude-code-router/logs/ directory with filenames like ccr-*.log
- Application-level logs: Routing decisions and business logic events are logged in ~/.claude-code-router/claude-code-router.log
- APIKEY (optional): You can set a secret key to authenticate requests. When set, clients must provide this key in the Authorization header (e.g., Bearer your-secret-key) or the x-api-key header. Example: "APIKEY": "your-secret-key".
- HOST (optional): You can set the host address for the server. If APIKEY is not set, the host will be forced to 127.0.0.1 for security reasons to prevent unauthorized access. Example: "HOST": "0.0.0.0".
- NON_INTERACTIVE_MODE (optional): When set to true, enables compatibility with non-interactive environments like GitHub Actions, Docker containers, or other CI/CD systems. This sets appropriate environment variables (CI=true, FORCE_COLOR=0, etc.) and configures stdin handling to prevent the process from hanging in automated environments. Example: "NON_INTERACTIVE_MODE": true.

- Providers: Used to configure different model providers.
- Router: Used to set up routing rules. default specifies the default model, which will be used for all requests if no other route is configured.
- API_TIMEOUT_MS: Specifies the timeout for API calls in milliseconds.

#### Environment Variable Interpolation

Claude Code Router supports environment variable interpolation for secure API key management. You can reference environment variables in your config.json using either $VAR_NAME or ${VAR_NAME} syntax:

`json
{
"OPENAI_API_KEY": "$OPENAI_API_KEY",
"GEMINI_API_KEY": "${GEMINI_API_KEY}",
"Providers": [
{
"name": "openai",
"api_base_url": "https://api.openai.com/v1/chat/completions",
"api_key": "$OPENAI_API_KEY",
"models": ["gpt-5", "gpt-5-mini"]
}
]
}
`

This allows you to keep sensitive API keys in environment variables instead of hardcoding them in configuration files. The interpolation works recursively through nested objects and arrays.

Here is a comprehensive example:

`json
{
"APIKEY": "your-secret-key",
"PROXY_URL": "http://127.0.0.1:7890",
"LOG": true,
"API_TIMEOUT_MS": 600000,
"NON_INTERACTIVE_MODE": false,
"Providers": [
{
"name": "openrouter",
"api_base_url": "https://openrouter.ai/api/v1/chat/completions",
"api_key": "sk-xxx",
"models": [
"google/gemini-2.5-pro-preview",
"anthropic/claude-sonnet-4",
"anthropic/claude-3.5-sonnet",
"anthropic/claude-3.7-sonnet:thinking"
],
"transformer": {
"use": ["openrouter"]
}
},
{
"name": "deepseek",
"api_base_url": "https://api.deepseek.com/chat/completions",
"api_key": "sk-xxx",
"models": ["deepseek-chat", "deepseek-reasoner"],
"transformer": {
"use": ["deepseek"],
"deepseek-chat": {
"use": ["tooluse"]
}
}
},
{
"name": "ollama",
"api_base_url": "http://localhost:11434/v1/chat/completions",
"api_key": "ollama",
"models": ["qwen2.5-coder:latest"]
},
{
"name": "gemini",
"api_base_url": "https://generativelanguage.googleapis.com/v1beta/models/",
"api_key": "sk-xxx",
"models": ["gemini-2.5-flash", "gemini-2.5-pro"],
"transformer": {
"use": ["gemini"]
}
},
{
"name": "volcengine",
"api_base_url": "https://ark.cn-beijing.volces.com/api/v3/chat/completions",
"api_key": "sk-xxx",
"models": ["deepseek-v3-250324", "deepseek-r1-250528"],
"transformer": {
"use": ["deepseek"]
}
},
{
"name": "modelscope",
"api_base_url": "https://api-inference.modelscope.cn/v1/chat/completions",
"api_key": "",
"models": ["Qwen/Qwen3-Coder-480B-A35B-Instruct", "Qwen/Qwen3-235B-A22B-Thinking-2507"],
"transformer": {
"use": [
[
"maxtoken",
{
"max_tokens": 65536
}
],
"enhancetool"
],
"Qwen/Qwen3-235B-A22B-Thinking-2507": {
"use": ["reasoning"]
}
}
},
{
"name": "dashscope",
"api_base_url": "https://dashscope.aliyuncs.com/compatible-mode/v1/chat/completions",
"api_key": "",
"models": ["qwen3-coder-plus"],
"transformer": {
"use": [
[
"maxtoken",
{
"max_tokens": 65536
}
],
"enhancetool"
]
}
},
{
"name": "aihubmix",
"api_base_url": "https://aihubmix.com/v1/chat/completions",
"api_key": "sk-",
"models": [
"Z/glm-4.5",
"claude-opus-4-20250514",
"gemini-2.5-pro"
]
}
],
"Router": {
"default": "deepseek,deepseek-chat",
"background": "ollama,qwen2.5-coder:latest",
"think": "deepseek,deepseek-reasoner",
"longContext": "openrouter,google/gemini-2.5-pro-preview",
"longContextThreshold": 60000,
"webSearch": "gemini,gemini-2.5-flash"
}
}
`

$3

Start Claude Code using the router:

`shell
ccr code
`

> Note: After modifying the configuration file, you need to restart the service for the changes to take effect:
>
> `shell
> ccr restart
> `

$3

For a more intuitive experience, you can use the UI mode to manage your configuration:

`shell
ccr ui
`

This will open a web-based interface where you can easily view and edit your config.json file.

!UI

$3

For users who prefer terminal-based workflows, you can use the interactive CLI model selector:

`shell
ccr model
`
![](blog/images/models.gif)

This command provides an interactive interface to:

- View current configuration:
- See all configured models (default, background, think, longContext, webSearch, image)
- Switch models: Quickly change which model is used for each router type
- Add new models: Add models to existing providers
- Create new providers: Set up complete provider configurations including:
- Provider name and API endpoint
- API key
- Available models
- Transformer configuration with support for:
- Multiple transformers (openrouter, deepseek, gemini, etc.)
- Transformer options (e.g., maxtoken with custom limits)
- Provider-specific routing (e.g., OpenRouter provider preferences)

The CLI tool validates all inputs and provides helpful prompts to guide you through the configuration process, making it easy to manage complex setups without editing JSON files manually.

$3

The activate command allows you to set up environment variables globally in your shell, enabling you to use the claude command directly or integrate Claude Code Router with applications built using the Agent SDK.

To activate the environment variables, run:

`shell
eval "$(ccr activate)"
`

This command outputs the necessary environment variables in shell-friendly format, which are then set in your current shell session. After activation, you can:

- Use claude command directly: Run claude commands without needing to use ccr code. The claude command will automatically route requests through Claude Code Router.
- Integrate with Agent SDK applications: Applications built with the Anthropic Agent SDK will automatically use the configured router and models.

The activate command sets the following environment variables:

- ANTHROPIC_AUTH_TOKEN: API key from your configuration
- ANTHROPIC_BASE_URL: The local router endpoint (default: http://127.0.0.1:3456)
- NO_PROXY: Set to 127.0.0.1 to prevent proxy interference
- DISABLE_TELEMETRY: Disables telemetry
- DISABLE_COST_WARNINGS: Disables cost warnings
- API_TIMEOUT_MS: API timeout from your configuration

> Note: Make sure the Claude Code Router service is running (ccr start) before using the activated environment variables. The environment variables are only valid for the current shell session. To make them persistent, you can add eval "$(ccr activate)" to your shell configuration file (e.g., ~/.zshrc or ~/.bashrc).

#### Providers

The Providers array is where you define the different model providers you want to use. Each provider object requires:

- name: A unique name for the provider.
- api_base_url: The full API endpoint for chat completions.
- api_key: Your API key for the provider.
- models: A list of model names available from this provider.
- transformer (optional): Specifies transformers to process requests and responses.

#### Transformers

Transformers allow you to modify the request and response payloads to ensure compatibility with different provider APIs.

- Global Transformer: Apply a transformer to all models from a provider. In this example, the openrouter transformer is applied to all models under the openrouter provider.
`json
{
"name": "openrouter",
"api_base_url": "https://openrouter.ai/api/v1/chat/completions",
"api_key": "sk-xxx",
"models": [
"google/gemini-2.5-pro-preview",
"anthropic/claude-sonnet-4",
"anthropic/claude-3.5-sonnet"
],
"transformer": { "use": ["openrouter"] }
}
`
- Model-Specific Transformer: Apply a transformer to a specific model. In this example, the deepseek transformer is applied to all models, and an additional tooluse transformer is applied only to the deepseek-chat model.

`json
{
"name": "deepseek",
"api_base_url": "https://api.deepseek.com/chat/completions",
"api_key": "sk-xxx",
"models": ["deepseek-chat", "deepseek-reasoner"],
"transformer": {
"use": ["deepseek"],
"deepseek-chat": { "use": ["tooluse"] }
}
}
`

- Passing Options to a Transformer: Some transformers, like maxtoken, accept options. To pass options, use a nested array where the first element is the transformer name and the second is an options object.
`json
{
"name": "siliconflow",
"api_base_url": "https://api.siliconflow.cn/v1/chat/completions",
"api_key": "sk-xxx",
"models": ["moonshotai/Kimi-K2-Instruct"],
"transformer": {
"use": [
[
"maxtoken",
{
"max_tokens": 16384
}
]
]
}
}
`

Available Built-in Transformers:

- Anthropic:If you use only the Anthropic transformer, it will preserve the original request and response parameters(you can use it to connect directly to an Anthropic endpoint).
- deepseek: Adapts requests/responses for DeepSeek API.
- gemini: Adapts requests/responses for Gemini API.
- openrouter: Adapts requests/responses for OpenRouter API. It can also accept a provider routing parameter to specify which underlying providers OpenRouter should use. For more details, refer to the OpenRouter documentation. See an example below:
`json
"transformer": {
"use": ["openrouter"],
"moonshotai/kimi-k2": {
"use": [
[
"openrouter",
{
"provider": {
"only": ["moonshotai/fp8"]
}
}
]
]
}
}
`
- groq: Adapts requests/responses for groq API.
- maxtoken: Sets a specific max_tokens value.
- tooluse: Optimizes tool usage for certain models via tool_choice.
- gemini-cli (experimental): Unofficial support for Gemini via Gemini CLI gemini-cli.js.
- reasoning: Used to process the reasoning_content field.
- sampling: Used to process sampling information fields such as temperature, top_p, top_k, and repetition_penalty.
- enhancetool: Adds a layer of error tolerance to the tool call parameters returned by the LLM (this will cause the tool call information to no longer be streamed).
- cleancache: Clears the cache_control field from requests.
- vertex-gemini: Handles the Gemini API using Vertex authentication.
- chutes-glm Unofficial support for GLM 4.5 model via Chutes chutes-glm-transformer.js.
- qwen-cli (experimental): Unofficial support for qwen3-coder-plus model via Qwen CLI qwen-cli.js.
- rovo-cli (experimental): Unofficial support for gpt-5 via Atlassian Rovo Dev CLI rovo-cli.js.

Custom Transformers:

You can also create your own transformers and load them via the transformers field in config.json.

`json
{
"transformers": [
{
"path": "/User/xxx/.claude-code-router/plugins/gemini-cli.js",
"options": {
"project": "xxx"
}
}
]
}
`

#### Router

The Router object defines which model to use for different scenarios:

- default: The default model for general tasks.
- background: A model for background tasks. This can be a smaller, local model to save costs.
- think: A model for reasoning-heavy tasks, like Plan Mode.
- longContext: A model for handling long contexts (e.g., > 60K tokens).
- longContextThreshold (optional): The token count threshold for triggering the long context model. Defaults to 60000 if not specified.
- webSearch: Used for handling web search tasks and this requires the model itself to support the feature. If you're using openrouter, you need to add the :online suffix after the model name.
- image (beta): Used for handling image-related tasks (supported by CCR’s built-in agent). If the model does not support tool calling, you need to set the config.forceUseImageAgent property to true.

- You can also switch models dynamically in Claude Code with the /model command:
/model provider_name,model_name
Example: /model openrouter,anthropic/claude-3.5-sonnet

#### Custom Router

For more advanced routing logic, you can specify a custom router script via the CUSTOM_ROUTER_PATH in your config.json. This allows you to implement complex routing rules beyond the default scenarios.

In your config.json:

`json
{
"CUSTOM_ROUTER_PATH": "/User/xxx/.claude-code-router/custom-router.js"
}
`

The custom router file must be a JavaScript module that exports an async function. This function receives the request object and the config object as arguments and should return the provider and model name as a string (e.g., "provider_name,model_name"), or null to fall back to the default router.

Here is an example of a custom-router.js based on custom-router.example.js:

`javascript
// /User/xxx/.claude-code-router/custom-router.js

/**
* A custom router function to determine which model to use based on the request.
*
* @param {object} req - The request object from Claude Code, containing the request body.
* @param {object} config - The application's config object.
* @returns {Promise} - A promise that resolves to the "provider,model_name" string, or null to use the default router.
*/
module.exports = async function router(req, config) {
const userMessage = req.body.messages.find((m) => m.role === "user")?.content;

if (userMessage && userMessage.includes("explain this code")) {
// Use a powerful model for code explanation
return "openrouter,anthropic/claude-3.5-sonnet";
}

// Fallback to the default router configuration
return null;
};
`

##### Subagent Routing

For routing within subagents, you must specify a particular provider and model by including provider,model at the beginning of the subagent's prompt. This allows you to direct specific subagent tasks to designated models.

Example:

`
openrouter,anthropic/claude-3.5-sonnet
Please help me analyze this code snippet for potential optimizations...
`

🔧 Request Augmentation

Claude Code Router includes a powerful request augmentation feature that allows you to intercept Claude Code requests, modify system prompts, add custom instructions, and inject contextual data before forwarding to OpenRouter.

$3

Add the Augment section to your config.json:

`json
{
"Augment": {
"enabled": true,
"modified_system_prompt": "You are an enhanced AI coding assistant with expertise in TypeScript and React.",
"additional_instructions": [
"Always include comprehensive error handling.",
"Prefer functional programming patterns.",
"Write tests for new functionality."
],
"extra_context": {
"project": {
"name": "my-web-app",
"framework": "next.js",
"language": "typescript"
}
},
"openrouter_endpoint": "https://openrouter.ai/api/v1/chat/completions",
"openrouter_auth": "$OPENROUTER_API_KEY",
"detection": {
"header_field": "x-agent",
"header_value": "claude-code"
}
}
}
`

$3

- System Prompt Modification: Replace the default Claude Code system prompt with your customized version
- Additional Instructions: Insert ordered instruction messages after the system prompt
- Extra Context: Attach structured JSON context (wrapped in tags)
- Request Detection: Identify Claude Code requests via HTTP headers or request metadata
- Message Preservation: Original user/assistant messages are never modified

$3

The augmentation activates when a request matches either:

1. Header Detection: X-Agent: claude-code
2. Metadata Detection: Request body contains {"metadata": {"agent": "claude-code"}}

$3

| Code | Condition | Description |
|------|-----------|-------------|
| 400 | Missing/invalid params | Invalid augmentation configuration |
| 502 | Network error | Failed to reach OpenRouter |
| 4xx/5xx | OpenRouter error | Propagated from upstream |

For complete documentation, see docs/AUGMENT.md.

Status Line (Beta)

Integrate Claude Code Router into your CI/CD pipeline. After setting up Claude Code Actions, modify your .github/workflows/claude.yaml to use the router:

`yaml
name: Claude Code

on:
issue_comment:
types: [created]
# ... other triggers

jobs:
claude:
if: |
(github.event_name == 'issue_comment' && contains(github.event.comment.body, '@claude')) ||
# ... other conditions
runs-on: ubuntu-latest
permissions:
contents: read
pull-requests: read
issues: read
id-token: write
steps:
- name: Checkout repository
uses: actions/checkout@v4
with:
fetch-depth: 1

- name: Prepare Environment
run: |
curl -fsSL https://bun.sh/install | bash
mkdir -p $HOME/.claude-code-router
cat << 'EOF' > $HOME/.claude-code-router/config.json
{
"log": true,
"NON_INTERACTIVE_MODE": true,
"OPENAI_API_KEY": "${{ secrets.OPENAI_API_KEY }}",
"OPENAI_BASE_URL": "https://api.deepseek.com",
"OPENAI_MODEL": "deepseek-chat"
}
EOF
shell: bash

- name: Start Claude Code Router
run: |
nohup ~/.bun/bin/bunx @musistudio/claude-code-router@1.0.8 start &
shell: bash

- name: Run Claude Code
id: claude
uses: anthropics/claude-code-action@beta
env:
ANTHROPIC_BASE_URL: http://localhost:3456
with:
anthropic_api_key: "any-string-is-ok"
`

> Note: When running in GitHub Actions or other automation environments, make sure to set "NON_INTERACTIVE_MODE": true` in your configuration to prevent the process from hanging due to stdin handling issues.

This setup allows for interesting automations, like running tasks during off-peak hours to reduce API costs.

📝 Further Reading

- Project Motivation and How It Works
- Maybe We Can Do More with the Router
- GLM-4.6 Supports Reasoning and Interleaved Thinking

❤️ Support & Sponsoring

If you find this project helpful, please consider sponsoring its development. Your support is greatly appreciated!


Paypal

$3

A huge thank you to all our sponsors for their generous support!

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