Add evaluator to MCP tools list, document missing endpoint (#1769)

Author: janhartman

docs/api/mcp/index.mdx

@@ -37,10 +37,11 @@ This works similarly for other MCP-compatible agents. See [Client Integrations](
 
 The MCP server provides different tool suites for various use cases:
 
-| Endpoint               | Description                     |
-| ---------------------- | ------------------------------- |
-| `/.api/mcp`            | Full suite of Sourcegraph tools |
-| `/.api/mcp/deepsearch` | Deep Search agent               |
+| Endpoint               | Description                         |
+| ---------------------- | ----------------------------------- |
+| `/.api/mcp`            | Core Sourcegraph search tools       |
+| `/.api/mcp/all`        | Full suite of Sourcegraph tools     |
+| `/.api/mcp/deepsearch` | Deep Search agent                   |
 
 Example URL:
 
@@ -264,6 +265,17 @@ Semantic search with flexible linguistic matching.
 
 **Features:** Flexible linguistic matching, stemming, broader results than keyword search
 
+#### `evaluator`
+
+Run sandboxed Lua scripts for aggregation, cross-referencing, and computation over search results.
+
+**Parameters:**
+
+- `script` - Lua script to execute against Sourcegraph search results (required)
+
+**Use cases:** Counting or aggregating many search matches, cross-referencing multiple searches, transforming or combining search output with custom logic
+
+
 ### Code Navigation
 
 #### `go_to_definition`