chuk-mcp-runtime
Officialby IBM
Server Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| HUB_ID | No | Hub instance identifier for distributed deployments | |
| POD_IP | No | Pod IP for service discovery | |
| HUB_URL | No | Hub registration endpoint URL | |
| HUB_ADDR | No | Hub communication address | |
| POD_NAME | No | Kubernetes pod name (auto-detected) | |
| HUB_TOKEN | No | Hub authentication token | |
| REDIS_URL | No | Redis connection URL (standalone or cluster with comma-separated nodes) | redis://localhost:6379 |
| AWS_REGION | No | AWS region for S3 storage | us-east-1 |
| JWT_LEEWAY | No | Clock drift tolerance in seconds for JWT validation | 0 |
| SANDBOX_ID | No | Another alternative sandbox ID | |
| ENVIRONMENT | No | Environment name for namespace isolation | dev |
| TOOL_TIMEOUT | No | Alternative tool timeout variable | |
| DEPLOYMENT_ID | No | Deployment identifier for namespace isolation | default |
| JWT_ALGORITHM | No | JWT signing algorithm | HS256 |
| SBX_TRANSPORT | No | Sandbox transport protocol (http, grpc) | |
| IBM_COS_APIKEY | No | IBM COS API key (IAM authentication) | |
| JWT_SECRET_KEY | No | JWT signing secret (required if auth is enabled) | |
| MCP_SANDBOX_ID | No | Sandbox identifier | |
| ARTIFACT_BUCKET | No | Bucket name for artifact storage | local-artifacts |
| CHUK_SANDBOX_ID | No | Alternative sandbox ID | |
| S3_ENDPOINT_URL | No | S3-compatible endpoint URL (for MinIO, Tigris, etc.) | |
| ARTIFACT_FS_ROOT | No | Base path for filesystem artifact storage | ./artifacts |
| IBM_COS_ENDPOINT | No | IBM Cloud Object Storage endpoint URL | |
| MCP_TOOL_TIMEOUT | No | Default tool timeout in seconds | 60 |
| AWS_ACCESS_KEY_ID | No | AWS access key ID for S3 storage | |
| CHUK_MCP_LOG_LEVEL | No | Global log level (DEBUG, INFO, WARNING, ERROR) | INFO |
| REDIS_TLS_INSECURE | No | Disable SSL certificate verification for Redis (0 or 1) | 0 |
| CHUK_MCP_CONFIG_PATH | No | Path to YAML config file | |
| IBM_COS_INSTANCE_CRN | No | IBM COS instance CRN | |
| SANDBOX_REGISTRY_TTL | No | Sandbox registry entry TTL in seconds | 86400 |
| AWS_SECRET_ACCESS_KEY | No | AWS secret access key for S3 storage | |
| JWT_ALLOWED_ALGORITHMS | No | Accepted JWT algorithms (comma-separated) | |
| ARTIFACT_SESSION_PROVIDER | No | Session provider for artifacts (memory, redis) | memory |
| ARTIFACT_STORAGE_PROVIDER | No | Artifact storage provider (memory, filesystem, s3, ibm_cos) | memory |
Capabilities
Features and capabilities supported by this server
| Capability | Details |
|---|---|
| tools | {
"listChanged": false
} |
| resources | {
"subscribe": false,
"listChanged": false
} |
| experimental | {} |
Tools
Functions exposed to the LLM to take actions
| Name | Description |
|---|---|
No tools | |
Prompts
Interactive templates invoked by user choice
| Name | Description |
|---|---|
No prompts | |
Resources
Contextual data attached and managed by the client
| Name | Description |
|---|---|
No resources | |
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