Lambda API Keys

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Selected key: API key On WSL, Codex stores settings in ~/.codex/config.toml inside the Linux home directory.

Use your Lambda API key as a Bearer token when calling the MCP endpoint https://api.lambda.dev/mcp/codex. The endpoint exposes your shared context files through the Model Context Protocol, so Codex (or any MCP client) can list those resources on demand. Update ~/.codex/config.toml (macOS/Linux/WSL) or %APPDATA%\Codex\config.toml (Windows) with the configuration below, then add the environment variable to your shell.

Create or locate the API key you want Codex to use. Keys are only shown once at creation time.

Set an environment variable before launching Codex:

echo 'export LAMBDA_MCP_API_KEY="<your-api-key>"' >> ~/.bashrc
source ~/.bashrc

Add the MCP server to your Codex configuration:

[mcp_servers.lambda-context]
url = "https://api.lambda.dev/mcp/codex"
bearer_token_env_var = "LAMBDA_MCP_API_KEY"
startup_timeout_sec = 30
tool_timeout_sec = 60

[features]
rmcp_client = true

You can verify the connection with a quick JSON-RPC call:

curl -X POST https://api.lambda.dev/mcp/codex \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $LAMBDA_MCP_API_KEY" \
  -d '{"jsonrpc":"2.0","id":1,"method":"resources/list","params":{}}'

Every listed resource includes metadata (session ID, path, chunk indexes, etc.) so that you can filter or group files inside Codex.

Selected key: API key

Use your Lambda API key to connect Claude Code to your shared context files and app storage through the Model Context Protocol.

Create or locate the API key you want Claude Code to use. Keys are only shown once at creation time.

Set an environment variable before launching Claude Code:

echo 'export LAMBDA_MCP_API_KEY="<your-api-key>"' >> ~/.bashrc
source ~/.bashrc

Add the MCP server to Claude Code:

claude mcp add-json lambda-context --scope user '{
  "type": "http",
  "url": "https://api.lambda.dev/mcp/claude",
  "headers": {
    "Authorization": "Bearer ${LAMBDA_MCP_API_KEY}"
  }
}'

Restart Claude Code. The Lambda MCP tools will be available:
- list_context_files - List shared context files
- read_context_file - Read a context file by ID
- search_context_files - Search files by content
- list_app_storage - List app storage entries
- read_app_storage - Read app storage by key

You can verify the connection with a quick test:

curl -X POST https://api.lambda.dev/mcp/claude \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $LAMBDA_MCP_API_KEY" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}'

Lambda API Keys

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API Keys

Desktop Automation Clients

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API Keys

Desktop Automation Clients

How it works

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Create New API Key

API Key Created Successfully

Connect This Key to Codex (MCP)

Register Desktop Automation Client

Client Registered Successfully

Next Steps:

Connect This Key to Claude Code (MCP)