diff --git a/crates/goose/src/agents/extension_manager.rs b/crates/goose/src/agents/extension_manager.rs
index c49049942b..0b51988720 100644
--- a/crates/goose/src/agents/extension_manager.rs
+++ b/crates/goose/src/agents/extension_manager.rs
@@ -1304,76 +1304,19 @@ impl ExtensionManager {
         cancellation_token: CancellationToken,
     ) -> Result<Vec<Content>, ErrorData> {
         let uri = require_str_parameter(&params, "uri")?;
+        let extension_name = require_str_parameter(&params, "extension_name")?;
 
-        let extension_name = params.get("extension_name").and_then(|v| v.as_str());
+        let read_result = self
+            .read_resource(session_id, uri, extension_name, cancellation_token)
+            .await?;
 
-        // If extension name is provided, we can just look it up
-        if let Some(ext_name) = extension_name {
-            let read_result = self
-                .read_resource(session_id, uri, ext_name, cancellation_token.clone())
-                .await?;
-
-            let mut result = Vec::new();
-            for content in read_result.contents {
-                if let ResourceContents::TextResourceContents { text, .. } = content {
-                    let content_str = format!("{}\n\n{}", uri, text);
-                    result.push(Content::text(content_str));
-                }
-            }
-            return Ok(result);
-        }
-
-        // If extension name is not provided, we need to search for the resource across all extensions
-        // Loop through each extension and try to read the resource, don't raise an error if the resource is not found
-        // TODO: do we want to find if a provided uri is in multiple extensions?
-        // currently it will return the first match and skip any others
-        let extension_names: Vec<String> = self
-            .extensions
-            .lock()
-            .await
-            .iter()
-            .filter(|(_name, ext)| ext.supports_resources())
-            .map(|(name, _)| name.clone())
-            .collect();
-
-        for extension_name in extension_names {
-            let read_result = self
-                .read_resource(session_id, uri, &extension_name, cancellation_token.clone())
-                .await;
-            match read_result {
-                Ok(read_result) => {
-                    let mut result = Vec::new();
-                    for content in read_result.contents {
-                        if let ResourceContents::TextResourceContents { text, .. } = content {
-                            let content_str = format!("{}\n\n{}", uri, text);
-                            result.push(Content::text(content_str));
-                        }
-                    }
-                    return Ok(result);
-                }
-                Err(_) => continue,
+        let mut result = Vec::new();
+        for content in read_result.contents {
+            if let ResourceContents::TextResourceContents { text, .. } = content {
+                result.push(Content::text(format!("{}\n\n{}", uri, text)));
             }
         }
-
-        // None of the extensions had the resource so we raise an error
-        let available_extensions = self
-            .extensions
-            .lock()
-            .await
-            .keys()
-            .map(|s| s.as_str())
-            .collect::<Vec<&str>>()
-            .join(", ");
-        let error_msg = format!(
-            "Resource with uri '{}' not found. Here are the available extensions: {}",
-            uri, available_extensions
-        );
-
-        Err(ErrorData::new(
-            ErrorCode::RESOURCE_NOT_FOUND,
-            error_msg,
-            None,
-        ))
+        Ok(result)
     }
 
     pub async fn read_resource(
@@ -1493,7 +1436,7 @@ impl ExtensionManager {
         params: Value,
         cancellation_token: CancellationToken,
     ) -> Result<Vec<Content>, ErrorData> {
-        let extension = params.get("extension").and_then(|v| v.as_str());
+        let extension = params.get("extension_name").and_then(|v| v.as_str());
 
         match extension {
             Some(extension_name) => {
diff --git a/crates/goose/src/agents/platform_extensions/ext_manager.rs b/crates/goose/src/agents/platform_extensions/ext_manager.rs
index 58221b690e..b54aae58f6 100644
--- a/crates/goose/src/agents/platform_extensions/ext_manager.rs
+++ b/crates/goose/src/agents/platform_extensions/ext_manager.rs
@@ -53,8 +53,7 @@ pub struct ManageExtensionsParams {
 #[derive(Debug, Clone, Serialize, Deserialize, JsonSchema)]
 pub struct ReadResourceParams {
     pub uri: String,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub extension_name: Option<String>,
+    pub extension_name: String,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, JsonSchema)]
@@ -325,15 +324,17 @@ impl ExtensionManagerClient {
             files, database schemas, or application-specific information. This tool lists resources
             in the provided extension, and returns a list for the user to browse. If no extension
             is provided, the tool will search all extensions for the resource.
-        "#}.to_string(),
+        "#}
+                            .to_string(),
                             Arc::new(
                                 serde_json::to_value(schema_for!(ListResourcesParams))
                                     .expect("Failed to serialize schema")
                                     .as_object()
                                     .expect("Schema must be an object")
-                                    .clone()
+                                    .clone(),
                             ),
-                        ).annotate(ToolAnnotations::from_raw(
+                        )
+                        .annotate(ToolAnnotations::from_raw(
                             Some("List resources".to_string()),
                             Some(true),
                             Some(false),
@@ -343,21 +344,24 @@ impl ExtensionManagerClient {
                         Tool::new(
                             READ_RESOURCE_TOOL_NAME.to_string(),
                             indoc! {r#"
-            Read a resource from an extension.
+            Read a resource from a specific extension.
 
             Resources allow extensions to share data that provide context to LLMs, such as
-            files, database schemas, or application-specific information. This tool searches for the
-            resource URI in the provided extension, and reads in the resource content. If no extension
-            is provided, the tool will search all extensions for the resource.
-        "#}.to_string(),
+            files, database schemas, or application-specific information. You must pass the
+            owning extension as `extension_name`; if you don't know which extension owns a
+            URI, call `list_resources` first — its output labels each resource with its
+            extension.
+        "#}
+                            .to_string(),
                             Arc::new(
                                 serde_json::to_value(schema_for!(ReadResourceParams))
                                     .expect("Failed to serialize schema")
                                     .as_object()
                                     .expect("Schema must be an object")
-                                    .clone()
+                                    .clone(),
                             ),
-                        ).annotate(ToolAnnotations::from_raw(
+                        )
+                        .annotate(ToolAnnotations::from_raw(
                             Some("Read a resource".to_string()),
                             Some(true),
                             Some(false),