---
title: "OutputFusionServerToolItem"
---
An openrouter:fusion server tool output item
## Fields
| Field | Type | Required | Description | Example |
| -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `analysis` | [Optional[components.FusionAnalysisResult]](../components/fusionanalysisresult.mdx) | :heavy_minus_sign: | Structured analysis produced by the fusion judge model. | \{
"blind_spots": [
"No model considered the impact on existing API consumers."
],
"consensus": [
"All panel models agree the request is asking for a concise summary."
],
"contradictions": [
\{
"stances": [
\{
"model": "openai/gpt-5",
"stance": "Favors an incremental rollout."
},
\{
"model": "anthropic/claude-sonnet-4.5",
"stance": "Favors a single coordinated migration."
}
],
"topic": "Recommended approach"
}
],
"partial_coverage": [
\{
"models": [
"openai/gpt-5"
],
"point": "Only one model addressed the rollback strategy."
}
],
"unique_insights": [
\{
"insight": "Highlighted a backwards-compatibility risk the other models missed.",
"model": "anthropic/claude-sonnet-4.5"
}
]
} |
| `error` | *Optional[str]* | :heavy_minus_sign: | Error message when the fusion run did not produce an analysis result. | |
| `failed_models` | List[[components.FailedModel](../components/failedmodel.mdx)] | :heavy_minus_sign: | Models that were requested as part of the analysis panel but did not produce a response. Present when at least one requested analysis model failed. The fusion result is still usable but was produced from a degraded panel. | |
| `failure_reason` | *Optional[str]* | :heavy_minus_sign: | Typed failure reason when the fusion run failed. Possible values include: all_panels_failed, insufficient_credits, rate_limited, judge_not_valid_json, judge_schema_mismatch, judge_upstream_error, judge_empty_completion. | |
| `id` | *Optional[str]* | :heavy_minus_sign: | N/A | |
| `responses` | List[[components.Response](../components/response.mdx)] | :heavy_minus_sign: | Analysis models that produced a response in this fusion run, with each model's full panel content. | |
| `sources` | List[[components.FusionSource](../components/fusionsource.mdx)] | :heavy_minus_sign: | Web pages the analysis panels and judge retrieved via web search during this fusion run, deduplicated by URL across the whole run. Present when at least one model cited a source. | |
| `status` | [components.ToolCallStatus](../components/toolcallstatus.mdx) | :heavy_check_mark: | N/A | completed |
| `type` | [components.OutputFusionServerToolItemType](../components/outputfusionservertoolitemtype.mdx) | :heavy_check_mark: | N/A | |