---
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.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | \{<br/>"blind_spots": [<br/>"No model considered the impact on existing API consumers."<br/>],<br/>"consensus": [<br/>"All panel models agree the request is asking for a concise summary."<br/>],<br/>"contradictions": [<br/>\{<br/>"stances": [<br/>\{<br/>"model": "openai/gpt-5",<br/>"stance": "Favors an incremental rollout."<br/>},<br/>\{<br/>"model": "anthropic/claude-sonnet-4.5",<br/>"stance": "Favors a single coordinated migration."<br/>}<br/>],<br/>"topic": "Recommended approach"<br/>}<br/>],<br/>"partial_coverage": [<br/>\{<br/>"models": [<br/>"openai/gpt-5"<br/>],<br/>"point": "Only one model addressed the rollback strategy."<br/>}<br/>],<br/>"unique_insights": [<br/>\{<br/>"insight": "Highlighted a backwards-compatibility risk the other models missed.",<br/>"model": "anthropic/claude-sonnet-4.5"<br/>}<br/>]<br/>} |
| `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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |