FusionServerToolConfig Type | OpenRouter Go SDK | OpenRouter

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Configuration for the openrouter:fusion server tool.

Fields

Field	Type	Required	Description	Example
`AnalysisModels`	[]`string`	➖	Slugs of models to run in parallel as the analysis panel. Each model receives the user prompt with openrouter:web_search and openrouter:web_fetch enabled, then a judge model summarizes the collective output into structured analysis JSON. Capped at 8 models to bound cost amplification. Defaults to the Quality preset from /labs/fusion.	[ “~anthropic/claude-opus-latest”, “~openai/gpt-latest”, “~google/gemini-pro-latest” ]
`MaxCompletionTokens`	`*int64`	➖	Maximum number of output tokens (including reasoning tokens) each panelist and the judge model may produce per inner call. Controls the total output budget so reasoning-heavy models like GPT-5.5 do not exhaust their token allowance before producing visible text. When omitted, the provider’s default applies.	16384
`MaxToolCalls`	`*int64`	➖	Maximum number of tool-calling steps each panelist (analysis model) and the judge model may take during their agentic web-research loop. Models with web_search/web_fetch enabled iterate until they produce a text response or hit this ceiling. Defaults to 8. Capped at 16.	12
`Model`	`*string`	➖	Slug of the judge model that produces the structured analysis JSON. Defaults to the model used in the outer API request.	~anthropic/claude-opus-latest
`Reasoning`	*components.FusionServerToolConfigReasoning	➖	Reasoning configuration forwarded to panelist and judge inner calls. Use this to control reasoning effort and token budget for models that support extended thinking.
`Temperature`	`*float64`	➖	Sampling temperature forwarded to panelist and judge inner calls. When omitted, the provider’s default applies.	0.7
`Tools`	[]components.FusionServerToolConfigTool	➖	Server tools available to panelist and judge inner calls. Each entry uses the same `{ type, parameters? }` shorthand as the outer Chat Completions request. When omitted, defaults to `[`{ type: “openrouter:web_search” }`,` { type: “openrouter:web_fetch” }`]`. Pass an empty array to disable tools entirely (panelists answer from parametric knowledge only).	[ `{"parameters": {"excluded_domains": ["example.com"]}`, “type”: “openrouter:web_search” }, `{"type": "openrouter:web_fetch"}` ]