fix: capitalize dashboard tool labels (#1761)

* fix: capitalize tool labels in dashboard

Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>

* fix: sentence-case dashboard tool labels

Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>

---------

Co-authored-by: Ramon Nogueira <270434257+ramon-langchain@users.noreply.github.com>
Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>
(cherry picked from commit dd5b7becb4dc9c633730fb4092a3cbd0c50dae9d)

Co-authored-by: Ramon Nogueira <ramon.nogueira@langchain.dev>

ui/src/features/agents/components/chat/ToolExecution.test.ts

@@ -36,4 +36,14 @@ describe("formatToolDisplay", () => {
   it("normalizes write_todos", () => {
     expect(formatToolDisplay("write todos", "other", {}, projectPath)).toBe("Update todos");
   });
+
+  it("sentence-cases raw tool names", () => {
+    expect(formatToolDisplay("enter_plan_mode", "other", {}, projectPath)).toBe(
+      "Enter plan mode",
+    );
+    expect(formatToolDisplay("save_plan", "other", {}, projectPath)).toBe("Save plan");
+    expect(formatToolDisplay("slack_thread_reply", "other", {}, projectPath)).toBe(
+      "Slack thread reply",
+    );
+  });
 });

ui/src/features/agents/components/chat/toolExecutionDisplay.ts

@@ -1,3 +1,4 @@
+import { humanizeToolName } from "@/features/agents/lib/toolNames";
 import type { AcpToolKind } from "@/features/agents/lib/types";
 
 function stripProjectPath(path: string, projectPath?: string): string {
@@ -27,7 +28,15 @@ function normalizedToolName(title: string): string {
 }
 
 function humanizeToolTitle(title: string): string {
-  return title.replace(/_/g, " ").trim() || "Tool";
+  const trimmed = title.trim();
+  if (!trimmed) return "Tool";
+
+  const [name, ...rest] = trimmed.split(/\s+/);
+  const suffix = rest.join(" ");
+  if (name && suffix && /^(?:[./~]|[a-z]+:\/\/)/i.test(suffix)) {
+    return `${humanizeToolName(name)} ${suffix}`;
+  }
+  return humanizeToolName(trimmed);
 }
 
 export function formatToolDisplay(

ui/src/features/agents/components/subagents/SubagentActivity.tsx

@@ -1,9 +1,7 @@
 import { useStreamContext as useAgentThreadStream, useToolCalls } from "@langchain/react"
 import { Check, Loader2, X } from "lucide-react"
 
-function humanizeToolName(name: string): string {
+import { humanizeToolName } from "@/features/agents/lib/toolNames"
-  return name.replace(/_/g, " ").trim() || "tool"
-}
 
 /**
  * Live status for a single subagent, read straight from the SDK's scoped

ui/src/features/agents/lib/streamMessagesToUi.ts

@@ -1,5 +1,6 @@
 import { AIMessage, HumanMessage, ToolMessage } from "@langchain/core/messages";
 import { messageArrivalTimestamp } from "./messageTimestamps";
+import { humanizeToolName } from "./toolNames";
 import type { BaseMessage, ContentBlock } from "@langchain/core/messages";
 import type { AssembledToolCall, SubagentDiscoverySnapshot } from "@langchain/react";
 
@@ -39,7 +40,7 @@ function toolTitle(name: string, args: Record<string, unknown>): string {
   if (typeof command === "string" && command.trim()) {
     return command.trim().split("\n")[0]?.slice(0, 120) ?? "";
   }
-  return name.replace(/_/g, " ").trim() || "Tool";
+  return humanizeToolName(name);
 }
 
 function parseToolArgs(raw: unknown): Record<string, unknown> {

ui/src/features/agents/lib/toolNames.ts

@@ -0,0 +1,10 @@
+export function humanizeToolName(name: string, fallback = "Tool"): string {
+  const normalized = name
+    .replace(/[_-]+/g, " ")
+    .trim()
+    .replace(/\s+/g, " ")
+    .toLowerCase()
+
+  if (!normalized) return fallback
+  return `${normalized.charAt(0).toUpperCase()}${normalized.slice(1)}`
+}