fix(coding-agent): honor custom renderers for built-in tool overrides closes #2595

packages/coding-agent/CHANGELOG.md

@@ -5,6 +5,7 @@
 ### Fixed
 
 - Fixed auto-compaction overflow recovery for Ollama models when the backend returns explicit `prompt too long; exceeded max context length ...` errors instead of silently truncating input ([#2626](https://github.com/badlogic/pi-mono/issues/2626))
+- Fixed built-in tool overrides that reuse built-in parameter schemas to still honor custom `renderCall` and `renderResult` renderers in the interactive TUI, restoring the `minimal-mode` example ([#2595](https://github.com/badlogic/pi-mono/issues/2595))
 
 ## [0.63.0] - 2026-03-27
 

packages/coding-agent/src/modes/interactive/components/tool-execution.ts

@@ -72,19 +72,11 @@ export class ToolExecutionComponent extends Container {
 		this.updateDisplay();
 	}
 
-	private isBuiltInDefinition(definition: ToolDefinition<any, any> | undefined): boolean {
-		return (
-			definition !== undefined &&
-			this.builtInToolDefinition !== undefined &&
-			definition.parameters === this.builtInToolDefinition.parameters
-		);
-	}
-
 	private getCallRenderer(): ToolDefinition<any, any>["renderCall"] | undefined {
 		if (!this.builtInToolDefinition) {
 			return this.toolDefinition?.renderCall;
 		}
-		if (!this.toolDefinition || this.isBuiltInDefinition(this.toolDefinition)) {
+		if (!this.toolDefinition) {
 			return this.builtInToolDefinition.renderCall;
 		}
 		return this.toolDefinition.renderCall ?? this.builtInToolDefinition.renderCall;
@@ -94,7 +86,7 @@ export class ToolExecutionComponent extends Container {
 		if (!this.builtInToolDefinition) {
 			return this.toolDefinition?.renderResult;
 		}
-		if (!this.toolDefinition || this.isBuiltInDefinition(this.toolDefinition)) {
+		if (!this.toolDefinition) {
 			return this.builtInToolDefinition.renderResult;
 		}
 		return this.toolDefinition.renderResult ?? this.builtInToolDefinition.renderResult;

packages/coding-agent/test/tool-execution-component.test.ts

@@ -4,7 +4,7 @@ import stripAnsi from "strip-ansi";
 import { beforeAll, describe, expect, test } from "vitest";
 import type { ToolDefinition } from "../src/core/extensions/types.js";
 import { type BashOperations, createBashToolDefinition } from "../src/core/tools/bash.js";
-import { createReadToolDefinition } from "../src/core/tools/read.js";
+import { createReadTool, createReadToolDefinition } from "../src/core/tools/read.js";
 import { createWriteToolDefinition } from "../src/core/tools/write.js";
 import { ToolExecutionComponent } from "../src/modes/interactive/components/tool-execution.js";
 import { initTheme } from "../src/modes/interactive/theme/theme.js";
@@ -166,6 +166,48 @@ describe("ToolExecutionComponent parity", () => {
 		expect(rendered).toContain("override result");
 	});
 
+	test("uses custom renderers for built-in overrides that reuse built-in definition parameters", () => {
+		const builtInDefinition = createReadToolDefinition(process.cwd());
+		const component = new ToolExecutionComponent(
+			"read",
+			"tool-4d",
+			{ path: "README.md" },
+			{},
+			{
+				...builtInDefinition,
+				renderCall: () => new Text("override call", 0, 0),
+				renderResult: () => new Text("override result", 0, 0),
+			},
+			createFakeTui(),
+		);
+		component.updateResult({ content: [{ type: "text", text: "hello" }], details: undefined, isError: false }, false);
+		const rendered = stripAnsi(component.render(120).join("\n"));
+		expect(rendered).toContain("override call");
+		expect(rendered).toContain("override result");
+		expect(rendered).not.toContain("read README.md");
+	});
+
+	test("uses custom renderers for built-in overrides that reuse wrapped built-in tool parameters", () => {
+		const builtInTool = createReadTool(process.cwd());
+		const component = new ToolExecutionComponent(
+			"read",
+			"tool-4e",
+			{ path: "README.md" },
+			{},
+			{
+				...createBaseToolDefinition("read"),
+				parameters: builtInTool.parameters,
+				renderCall: () => new Text("wrapped override call", 0, 0),
+				renderResult: () => new Text("wrapped override result", 0, 0),
+			},
+			createFakeTui(),
+		);
+		component.updateResult({ content: [{ type: "text", text: "hello" }], details: undefined, isError: false }, false);
+		const rendered = stripAnsi(component.render(120).join("\n"));
+		expect(rendered).toContain("wrapped override call");
+		expect(rendered).toContain("wrapped override result");
+	});
+
 	test("shares renderer state across custom call and result slots", () => {
 		type RenderState = { token?: string };
 		const toolDefinition: ToolDefinition<any, unknown, RenderState> = {