diff --git a/client/extension-api/package.json b/client/extension-api/package.json
index c4c938b8a08..79ab9498a1c 100644
--- a/client/extension-api/package.json
+++ b/client/extension-api/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sourcegraph",
-  "version": "25.1.0",
+  "version": "25.2.0",
   "license": "Apache-2.0",
   "description": "Sourcegraph extension API: build extensions that enhance reading and reviewing code in your existing tools",
   "author": "Sourcegraph",
diff --git a/client/extension-api/src/sourcegraph.d.ts b/client/extension-api/src/sourcegraph.d.ts
index 2ead7840cc9..d1c7a79926c 100644
--- a/client/extension-api/src/sourcegraph.d.ts
+++ b/client/extension-api/src/sourcegraph.d.ts
@@ -1236,6 +1236,21 @@ declare module 'sourcegraph' {
          * An event that is fired when a workspace's version context changes.
          */
         export const versionContextChanges: Subscribable<string | undefined>
+
+        /**
+         * The current search context of the workspace, if any.
+         *
+         * A search context is a set of repositories and revisions on a Sourcegraph instance.
+         * When set, extensions use it to scope search queries, code intelligence actions, etc.
+         *
+         * See more information at https://docs.sourcegraph.com/code_search/explanations/features#search-contexts-experimental.
+         */
+        export const searchContext: string | undefined
+
+        /**
+         * An event that is fired when a workspace's search context changes.
+         */
+        export const searchContextChanges: Subscribable<string | undefined>
     }
 
     /**
diff --git a/client/shared/src/api/contract.ts b/client/shared/src/api/contract.ts
index d41437dd147..de000f305fd 100644
--- a/client/shared/src/api/contract.ts
+++ b/client/shared/src/api/contract.ts
@@ -45,6 +45,7 @@ export interface FlatExtensionHostAPI {
     removeWorkspaceRoot: (uri: string) => void
 
     setVersionContext: (versionContext: string | undefined) => void
+    setSearchContext: (searchContext: string | undefined) => void
 
     // Search
     transformSearchQuery: (query: string) => ProxySubscribable<string>
diff --git a/client/shared/src/api/extension/extensionApi.ts b/client/shared/src/api/extension/extensionApi.ts
index a0cfc24a9c0..ad06fc2ae46 100644
--- a/client/shared/src/api/extension/extensionApi.ts
+++ b/client/shared/src/api/extension/extensionApi.ts
@@ -56,11 +56,15 @@ export function createExtensionAPI(state: ExtensionHostState, mainAPI: Remote<Ma
         get versionContext() {
             return state.versionContext
         },
+        get searchContext() {
+            return state.searchContext
+        },
         onDidOpenTextDocument: state.openedTextDocuments.asObservable(),
         openedTextDocuments: state.openedTextDocuments.asObservable(),
         onDidChangeRoots: state.roots.pipe(mapTo(undefined)),
         rootChanges: state.rootChanges.asObservable(),
         versionContextChanges: state.versionContextChanges.asObservable(),
+        searchContextChanges: state.searchContextChanges.asObservable(),
     }
 
     const createProgressReporter = async (
diff --git a/client/shared/src/api/extension/extensionHostApi.ts b/client/shared/src/api/extension/extensionHostApi.ts
index 20a7030da17..ee922d659b5 100644
--- a/client/shared/src/api/extension/extensionHostApi.ts
+++ b/client/shared/src/api/extension/extensionHostApi.ts
@@ -107,6 +107,10 @@ export function createExtensionHostAPI(state: ExtensionHostState): FlatExtension
             state.versionContext = context
             state.versionContextChanges.next(context)
         },
+        setSearchContext: context => {
+            state.searchContext = context
+            state.searchContextChanges.next(context)
+        },
 
         // Search
         transformSearchQuery: query =>
diff --git a/client/shared/src/api/extension/extensionHostState.ts b/client/shared/src/api/extension/extensionHostState.ts
index 1b66b4894cf..7704098fe59 100644
--- a/client/shared/src/api/extension/extensionHostState.ts
+++ b/client/shared/src/api/extension/extensionHostState.ts
@@ -36,6 +36,8 @@ export function createExtensionHostState(
         rootChanges: new Subject<void>(),
         versionContextChanges: new Subject<string | undefined>(),
         versionContext: undefined,
+        searchContextChanges: new Subject<string | undefined>(),
+        searchContext: undefined,
 
         // Most extensions never call `configuration.get()` synchronously in `activate()` to get
         // the initial settings data, and instead only subscribe to configuration changes.
@@ -110,6 +112,8 @@ export interface ExtensionHostState {
     rootChanges: Subject<void>
     versionContextChanges: Subject<string | undefined>
     versionContext: string | undefined
+    searchContextChanges: Subject<string | undefined>
+    searchContext: string | undefined
 
     // Search
     queryTransformers: BehaviorSubject<readonly sourcegraph.QueryTransformer[]>
diff --git a/client/web/src/SourcegraphWebApp.tsx b/client/web/src/SourcegraphWebApp.tsx
index 48ecb5857ca..857b90a6f72 100644
--- a/client/web/src/SourcegraphWebApp.tsx
+++ b/client/web/src/SourcegraphWebApp.tsx
@@ -386,6 +386,10 @@ class ColdSourcegraphWebApp extends React.Component<SourcegraphWebAppProps, Sour
             console.error('Error sending initial version context to extensions', error)
         })
 
+        this.setWorkspaceSearchContext(this.state.selectedSearchContextSpec).catch(error => {
+            console.error('Error sending search context to extensions', error)
+        })
+
         this.userRepositoriesUpdates.next()
     }
 
@@ -566,10 +570,19 @@ class ColdSourcegraphWebApp extends React.Component<SourcegraphWebAppProps, Sour
                 availableSearchContextSpecOrDefault => {
                     this.setState({ selectedSearchContextSpec: availableSearchContextSpecOrDefault })
                     localStorage.setItem(LAST_SEARCH_CONTEXT_KEY, availableSearchContextSpecOrDefault)
+
+                    this.setWorkspaceSearchContext(availableSearchContextSpecOrDefault).catch(error => {
+                        console.error('Error sending search context to extensions', error)
+                    })
                 }
             )
         )
     }
+
+    private async setWorkspaceSearchContext(spec: string | undefined): Promise<void> {
+        const extensionHostAPI = await this.extensionsController.extHostAPI
+        await extensionHostAPI.setSearchContext(spec)
+    }
 }
 
 export const SourcegraphWebApp = hot(ColdSourcegraphWebApp)