helper to specifially rewrite proxied tool answer

src/wf_mcp/proxy_results/__init__.py

@@ -0,0 +1,11 @@
+from .resource_links import (
+    ResourceUriRewriter,
+    rewrite_call_tool_result_resource_links,
+    rewrite_resource_link_content,
+)
+
+__all__ = [
+    "ResourceUriRewriter",
+    "rewrite_call_tool_result_resource_links",
+    "rewrite_resource_link_content",
+]

src/wf_mcp/proxy_results/resource_links.py

@@ -0,0 +1,37 @@
+from __future__ import annotations
+
+from collections.abc import Callable
+
+import mcp.types as mcp_types
+
+ResourceUriRewriter = Callable[[str], str]
+
+
+def rewrite_resource_link_content(
+    content: mcp_types.ContentBlock,
+    rewrite_uri: ResourceUriRewriter,
+) -> mcp_types.ContentBlock:
+    """Return content with ResourceLink URI rewritten through a proxy mapper.
+
+    FastMCP's Namespace transform rewrites listed resource URIs, but tool-call
+    results can also contain typed ResourceLink content. This helper is pure and
+    uses the official MCP models so it can be reused by a future proxy hook.
+    """
+    if not isinstance(content, mcp_types.ResourceLink):
+        return content
+    return content.model_copy(update={"uri": rewrite_uri(str(content.uri))})
+
+
+def rewrite_call_tool_result_resource_links(
+    result: mcp_types.CallToolResult,
+    rewrite_uri: ResourceUriRewriter,
+) -> mcp_types.CallToolResult:
+    """Return a copy of a tool result with ResourceLink content URIs rewritten."""
+    return result.model_copy(
+        update={
+            "content": [
+                rewrite_resource_link_content(content, rewrite_uri)
+                for content in result.content
+            ]
+        }
+    )

src/wf_mcp/transparent_proxy/admin.py

@@ -145,4 +145,3 @@ async def _send_reload_notifications(ctx: Context, result: ProxyReloadResult) ->
     sink = FastMcpContextNotificationSink(ctx)
     for event in reload_change_events(result):
         await sink.send_event(event)
-