OpenRouter Fusion MCP Server
Server Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| OPENROUTER_API_KEY | Yes | Your OpenRouter API key (inference key) with credit. | |
| OPENROUTER_FUSION_PRESETS | No | Legacy: a JSON map of preset names to config objects. | |
| OPENROUTER_FUSION_PERSO_CONFIG | No | Legacy: a single custom config object for 'perso' preset. | |
| OPENROUTER_FUSION_DEFAULT_REASONING | No | Default reasoning effort for fusion configs (e.g., high, medium). |
Capabilities
Features and capabilities supported by this server
| Capability | Details |
|---|---|
| tools | {
"listChanged": true
} |
Tools
Functions exposed to the LLM to take actions
| Name | Description |
|---|---|
| fusion_listA | List the available Fusion configurations — name, label, panel (analysis_models), judge (orchestrator/'Fuse with'), reasoning_effort, temperature, description. Call this FIRST when the user asks to 'use Fusion' without naming a config: show the list, let them choose (quality, budget, or a custom one), then run fusion_start with preset:''. |
| fusion_startA | Start an OpenRouter Fusion deliberation in the BACKGROUND and return a job_id immediately (never times out), then call fusion_result with the job_id. Pick a config with preset:'' — call fusion_list to see them (quality, budget, + custom configs). Default: quality. reasoning_effort and temperature default to the config's; override per call if needed. |
| fusion_resultA | Fetch the result of a fusion_start job. Long-polls up to ~45s: returns the synthesized answer when ready, or {status:'running'} (call again with the same job_id). Fast per call, so it never hits the client timeout. |
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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