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58 lines
2 KiB
Text
58 lines
2 KiB
Text
---
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title: prefab_synthesis
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sidebarTitle: prefab_synthesis
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---
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# `fastmcp.server.providers.prefab_synthesis`
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On-demand Prefab renderer resource synthesis.
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Tools marked as Prefab (via ``app=True``, ``PrefabAppConfig``, etc.) carry
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a placeholder ``meta.ui.resourceUri`` and optionally a hash in
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``meta.fastmcp._tool_hash``. This module synthesizes per-tool renderer
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resources on demand at ``list_resources`` and ``read_resource`` time
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without storing or materializing anything.
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Each tool's resource URI is ``ui://prefab/tool/<hash>/renderer.html``
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where the hash comes from the tool's own meta (set at registration from
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the app name + tool name). CSP on the resource is the tool's
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``meta.ui.csp`` merged with the renderer defaults across all four
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``*_domains`` fields.
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## Functions
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### `synthesize_prefab_resources` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/providers/prefab_synthesis.py#L200" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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synthesize_prefab_resources(server: FastMCP) -> list[Resource]
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```
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Return fresh synthetic Prefab resources for all prefab tools. Pure.
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### `synthesize_prefab_resource_by_uri` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/providers/prefab_synthesis.py#L215" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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synthesize_prefab_resource_by_uri(server: FastMCP, uri: str) -> Resource | None
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```
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Intercept a Prefab renderer URI and synthesize on demand.
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### `rewrite_tool_meta_for_wire` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/providers/prefab_synthesis.py#L228" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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rewrite_tool_meta_for_wire(tool: Tool) -> Tool
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```
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Return a model_copy with the per-tool URI and CSP stripped.
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Reads the hash from the tool's own meta. If no hash is found,
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returns the tool unchanged. Produces a fresh copy — the original
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Tool object is untouched.
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