diff --git a/package-lock.json b/package-lock.json
index 04c889174..44ead3b0b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2128,6 +2128,30 @@
 				"node": ">= 14"
 			}
 		},
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+			"resolved": "https://registry.npmjs.org/ajv/-/ajv-8.20.0.tgz",
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+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
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+				"fast-uri": "^3.0.1",
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+			},
+			"funding": {
+				"type": "github",
+				"url": "https://github.com/sponsors/epoberezkin"
+			}
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+			"resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
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+			"dev": true,
+			"license": "Python-2.0"
+		},
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 			"resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.6.tgz",
@@ -2159,6 +2183,32 @@
 				"js-tokens": "^10.0.0"
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+		"node_modules/autoevals": {
+			"version": "0.3.0",
+			"resolved": "https://registry.npmjs.org/autoevals/-/autoevals-0.3.0.tgz",
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+			"dev": true,
+			"hasInstallScript": true,
+			"license": "MIT",
+			"dependencies": {
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+				"mustache": "^4.2.0",
+				"openai": "^6.7.0",
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+			},
+			"engines": {
+				"npm": "please-use-pnpm",
+				"pnpm": ">=10.27.0",
+				"yarn": "please-use-pnpm"
+			},
+			"peerDependencies": {
+				"zod": "^3.25.0 || ^4.0.0"
+			}
+		},
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@@ -2206,6 +2256,13 @@
 				"node": "*"
 			}
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+			"resolved": "https://registry.npmjs.org/binary-search/-/binary-search-1.3.6.tgz",
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+			"dev": true,
+			"license": "CC0-1.0"
+		},
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 			"resolved": "https://registry.npmjs.org/bl/-/bl-4.1.0.tgz",
@@ -2338,6 +2395,13 @@
 				"url": "https://github.com/chalk/chalk?sponsor=1"
 			}
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+			"resolved": "https://registry.npmjs.org/cheminfo-types/-/cheminfo-types-1.16.0.tgz",
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+			"dev": true,
+			"license": "MIT"
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@@ -2354,6 +2418,38 @@
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 			}
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+			"resolved": "https://registry.npmjs.org/compute-cosine-similarity/-/compute-cosine-similarity-1.1.0.tgz",
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+			"dev": true,
+			"dependencies": {
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+				"validate.io-array": "^1.0.5",
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+		"node_modules/compute-dot": {
+			"version": "1.1.0",
+			"resolved": "https://registry.npmjs.org/compute-dot/-/compute-dot-1.1.0.tgz",
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+			"version": "1.1.0",
+			"resolved": "https://registry.npmjs.org/compute-l2norm/-/compute-l2norm-1.1.0.tgz",
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+			"dev": true,
+			"dependencies": {
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 			"license": "MIT"
 		},
+		"node_modules/fast-deep-equal": {
+			"version": "3.1.3",
+			"resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz",
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+			"dev": true,
+			"license": "MIT"
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 			"license": "Unlicense"
 		},
+		"node_modules/fast-uri": {
+			"version": "3.1.8",
+			"resolved": "https://registry.npmjs.org/fast-uri/-/fast-uri-3.1.8.tgz",
+			"integrity": "sha512-GZMtZUTNRpOVIECoXwLNZS5xUGE+mVNbTB8h/7Rwh2TFWcBQiPzTgyZi05BF9UMZKkLJv8XBRJTlU7zg8+ZfMg==",
+			"dev": true,
+			"funding": [
+				{
+					"type": "github",
+					"url": "https://github.com/sponsors/fastify"
+				},
+				{
+					"type": "opencollective",
+					"url": "https://opencollective.com/fastify"
+				}
+			],
+			"license": "BSD-3-Clause"
+		},
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@@ -2721,6 +2841,13 @@
 				"node": "^12.20 || >= 14.13"
 			}
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+		"node_modules/fft.js": {
+			"version": "4.0.4",
+			"resolved": "https://registry.npmjs.org/fft.js/-/fft.js-4.0.4.tgz",
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+			"dev": true,
+			"license": "MIT"
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@@ -3049,6 +3176,13 @@
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+			"version": "3.0.0",
+			"resolved": "https://registry.npmjs.org/is-any-array/-/is-any-array-3.0.0.tgz",
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+			"dev": true,
+			"license": "MIT"
+		},
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 			"resolved": "https://registry.npmjs.org/is-core-module/-/is-core-module-2.16.2.tgz",
@@ -3175,6 +3309,16 @@
 				"jiti": "lib/jiti-cli.mjs"
 			}
 		},
+		"node_modules/js-levenshtein": {
+			"version": "1.1.6",
+			"resolved": "https://registry.npmjs.org/js-levenshtein/-/js-levenshtein-1.1.6.tgz",
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+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=0.10.0"
+			}
+		},
 		"node_modules/js-tokens": {
 			"version": "10.0.0",
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@@ -3182,6 +3326,29 @@
 			"dev": true,
 			"license": "MIT"
 		},
+		"node_modules/js-yaml": {
+			"version": "4.3.2",
+			"resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.3.2.tgz",
+			"integrity": "sha512-SFNOvSJ+Dgf/9An904Yx+CgSlIPCkIpao4qo51lpee25TIRejdH3rhR4EZMGoNx3/TP3O+wzWuiTFl4sqbltzA==",
+			"dev": true,
+			"funding": [
+				{
+					"type": "github",
+					"url": "https://github.com/sponsors/puzrin"
+				},
+				{
+					"type": "github",
+					"url": "https://github.com/sponsors/nodeca"
+				}
+			],
+			"license": "MIT",
+			"dependencies": {
+				"argparse": "^2.0.1"
+			},
+			"bin": {
+				"js-yaml": "bin/js-yaml.js"
+			}
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@@ -3204,6 +3371,13 @@
 				"node": ">=16"
 			}
 		},
+		"node_modules/json-schema-traverse": {
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-1.0.0.tgz",
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+			"dev": true,
+			"license": "MIT"
+		},
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 			"resolved": "https://registry.npmjs.org/jwa/-/jwa-2.0.1.tgz",
@@ -3486,6 +3660,18 @@
 				"url": "https://opencollective.com/parcel"
 			}
 		},
+		"node_modules/linear-sum-assignment": {
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+			"resolved": "https://registry.npmjs.org/linear-sum-assignment/-/linear-sum-assignment-1.0.9.tgz",
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+			"license": "MIT",
+			"dependencies": {
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+				"ml-matrix": "^6.12.1",
+				"ml-spectra-processing": "^14.18.0"
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@@ -3626,12 +3812,87 @@
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 			"license": "MIT"
 		},
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+			"version": "2.0.0",
+			"resolved": "https://registry.npmjs.org/ml-array-max/-/ml-array-max-2.0.0.tgz",
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+			"license": "MIT",
+			"dependencies": {
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+			"license": "MIT",
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+			"license": "MIT",
+			"dependencies": {
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+			"license": "MIT",
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 			"license": "MIT"
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+			"license": "MIT",
+			"bin": {
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@@ -4094,6 +4355,16 @@
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+			"license": "MIT",
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@@ -4665,6 +4936,19 @@
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+			"dev": true,
+			"license": "MIT"
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@@ -4980,6 +5264,16 @@
 				"url": "https://github.com/sponsors/colinhacks"
 			}
 		},
+		"node_modules/zod-to-json-schema": {
+			"version": "3.25.0",
+			"resolved": "https://registry.npmjs.org/zod-to-json-schema/-/zod-to-json-schema-3.25.0.tgz",
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+			"dev": true,
+			"license": "ISC",
+			"peerDependencies": {
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 		"packages/agent": {
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 			"version": "0.85.1",
@@ -5225,6 +5519,7 @@
 				"@earendil-works/pi-coding-agent": "^0.85.1",
 				"@types/node": "22.19.19",
 				"@vitest-evals/core": "0.15.0",
+				"autoevals": "0.3.0",
 				"shx": "0.4.0",
 				"typescript": "5.9.3",
 				"vitest": "4.1.9",
diff --git a/packages/coding-agent/src/modes/interactive/interactive-mode.ts b/packages/coding-agent/src/modes/interactive/interactive-mode.ts
index 81d6e0dea..3219e0634 100644
--- a/packages/coding-agent/src/modes/interactive/interactive-mode.ts
+++ b/packages/coding-agent/src/modes/interactive/interactive-mode.ts
@@ -35,6 +35,7 @@ import {
 	Spacer,
 	setCapabilityOverrides,
 	setKeybindings,
+	type Terminal,
 	Text,
 	TruncatedText,
 	type TUI,
@@ -371,6 +372,8 @@ export interface InteractiveModeOptions {
 	tuiMode?: TuiMode;
 	/** Initial interactive theme setting for this invocation. */
 	initialThemeSetting?: string;
+	/** Terminal implementation. Defaults to the current process terminal. */
+	terminal?: Terminal;
 }
 
 export class InteractiveMode {
@@ -536,6 +539,7 @@ export class InteractiveMode {
 			tuiMode,
 			showHardwareCursor: this.settingsManager.getShowHardwareCursor(),
 			logDirectory: getAgentDir(),
+			terminal: options.terminal,
 			onRightClickPaste: this.onRightClickPaste,
 			fullscreenCopyOnSelect: this.settingsManager.getFullscreenCopyOnSelect(),
 		});
diff --git a/packages/evals/evals/tui.docs.eval.ts b/packages/evals/evals/tui.docs.eval.ts
new file mode 100644
index 000000000..eddd20a97
--- /dev/null
+++ b/packages/evals/evals/tui.docs.eval.ts
@@ -0,0 +1,264 @@
+import { setTimeout } from "node:timers/promises";
+import { stripVTControlCharacters } from "node:util";
+import type { AssistantMessage } from "@earendil-works/pi-ai";
+import {
+	type AgentSession,
+	AgentSessionRuntime,
+	type AgentSessionServices,
+	InteractiveMode,
+	SessionManager,
+	createAgentSessionFromServices,
+} from "@earendil-works/pi-coding-agent";
+import { Levenshtein } from "autoevals";
+import { createJudge, describeEval } from "vitest-evals";
+import { createPiDocumentationEvalHarness, type PiCodingAgentInput } from "../src/harness.ts";
+
+const CONTEXT_WINDOW = 272_000;
+const BUILT_IN_CONTEXT_PATTERN = /\d+(?:\.\d+)?%\/272k(?: \(auto\))?/;
+const CONTEXT_FIXTURES = [
+	{ percent: 42.2, expectedBar: "████░░░░░░ 42%" },
+	{ percent: 65, expectedBar: "███████░░░ 65%" },
+	{ percent: 120, expectedBar: "██████████ 100%" },
+] as const;
+
+class RecordingTerminal {
+	readonly columns = 100;
+	readonly rows = 30;
+	readonly kittyProtocolActive = true;
+	private writes: string[] = [];
+	private resizeHandler?: () => void;
+
+	start(_onInput: (data: string) => void, onResize: () => void): void {
+		this.resizeHandler = onResize;
+	}
+
+	stop(): void {
+		this.resizeHandler = undefined;
+	}
+
+	async drainInput(_maxMs?: number, _idleMs?: number): Promise<void> {}
+
+	write(data: string): void {
+		this.writes.push(data);
+	}
+
+	moveBy(_lines: number): void {}
+	hideCursor(): void {}
+	showCursor(): void {}
+	clearLine(): void {}
+	clearFromCursor(): void {}
+	clearScreen(): void {}
+	setTitle(_title: string): void {}
+	setProgress(_active: boolean): void {}
+
+	requestResize(): void {
+		this.resizeHandler?.();
+	}
+
+	async takeRenders(): Promise<string[]> {
+		await setTimeout(30);
+		const output = this.writes.join("");
+		this.writes = [];
+		const startMarker = "\x1b[?2026h";
+		const endMarker = "\x1b[?2026l";
+		const renders: string[] = [];
+		let offset = 0;
+		while (true) {
+			const start = output.indexOf(startMarker, offset);
+			if (start === -1) return renders;
+			const contentStart = start + startMarker.length;
+			const end = output.indexOf(endMarker, contentStart);
+			if (end === -1) throw new Error("TUI emitted an incomplete synchronized render.");
+			renders.push(stripVTControlCharacters(output.slice(contentStart, end)));
+			offset = end + endMarker.length;
+		}
+	}
+}
+
+type TuiFooterOutput = {
+	builtInStatusLine: string | null;
+	observations: Array<{
+		percent: number;
+		renderedOutput: string;
+		contextUsage: { tokens: number | null; contextWindow: number; percent: number | null } | null;
+	}>;
+	extensionErrors: string[];
+};
+
+function lines(output: string): string[] {
+	return output.split(/[\r\n]+/).filter((line) => line.trim().length > 0);
+}
+
+function createContextMessage(model: NonNullable<AgentSession["model"]>, percent: number): AssistantMessage {
+	const tokens = Math.round((model.contextWindow * percent) / 100);
+	return {
+		role: "assistant",
+		content: [{ type: "text", text: "Context usage fixture" }],
+		api: model.api,
+		provider: model.provider,
+		model: model.id,
+		usage: {
+			input: tokens,
+			output: 0,
+			cacheRead: 0,
+			cacheWrite: 0,
+			totalTokens: tokens,
+			cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
+		},
+		stopReason: "stop",
+		timestamp: Date.now(),
+	};
+}
+
+async function inspectContextFooter(session: AgentSession, agentDir: string): Promise<TuiFooterOutput> {
+	const activeModel = session.model;
+	if (!activeModel) throw new Error("TUI footer oracle requires an active model.");
+	const model = { ...activeModel, contextWindow: CONTEXT_WINDOW };
+	const services: AgentSessionServices = {
+		cwd: session.sessionManager.getCwd(),
+		agentDir,
+		modelRuntime: session.modelRuntime,
+		settingsManager: session.settingsManager,
+		resourceLoader: session.resourceLoader,
+		diagnostics: [],
+	};
+	const oracleSession = (
+		await createAgentSessionFromServices({
+			services,
+			sessionManager: SessionManager.inMemory(services.cwd),
+			model,
+			thinkingLevel: "high",
+			noTools: "all",
+		})
+	).session;
+	const runtime = new AgentSessionRuntime(oracleSession, services, async () => {
+		throw new Error("The TUI footer oracle does not replace sessions.");
+	});
+	const terminal = new RecordingTerminal();
+	const mode = new InteractiveMode(runtime, { tuiMode: "regular", terminal });
+	const previousOffline = process.env.PI_OFFLINE;
+	process.env.PI_OFFLINE = "1";
+	try {
+		oracleSession.sessionManager.appendMessage({
+			...createContextMessage(model, 0),
+			usage: {
+				input: 106_000,
+				output: 5_800,
+				cacheRead: 606_000,
+				cacheWrite: 0,
+				totalTokens: 717_800,
+				cost: { input: 1.008, output: 0, cacheRead: 0, cacheWrite: 0, total: 1.008 },
+			},
+		});
+		let builtInStatusLine: string | null = null;
+		const observations: TuiFooterOutput["observations"] = [];
+		for (const [index, { percent }] of CONTEXT_FIXTURES.entries()) {
+			oracleSession.agent.state.messages = [createContextMessage(model, percent)];
+			if (index === 0) await mode.init();
+			else terminal.requestResize();
+			const renders = await terminal.takeRenders();
+			if (index === 0) {
+				builtInStatusLine = renders.flatMap(lines).find((line) => BUILT_IN_CONTEXT_PATTERN.test(line)) ?? null;
+			}
+			observations.push({
+				percent,
+				renderedOutput: renders.at(-1) ?? "",
+				contextUsage: oracleSession.getContextUsage() ?? null,
+			});
+		}
+		return {
+			builtInStatusLine,
+			observations,
+			extensionErrors: session.resourceLoader.getExtensions().errors.map(({ error }) => error),
+		};
+	} finally {
+		try {
+			mode.stop("resume-hint");
+		} finally {
+			try {
+				await runtime.dispose();
+			} finally {
+				if (previousOffline === undefined) delete process.env.PI_OFFLINE;
+				else process.env.PI_OFFLINE = previousOffline;
+			}
+		}
+	}
+}
+
+const harness = createPiDocumentationEvalHarness({
+	output: ({ session, agentDir }) => inspectContextFooter(session, agentDir),
+});
+
+const contextFooterJudge = createJudge<PiCodingAgentInput, TuiFooterOutput>(
+	"ContextFooterJudge",
+	async ({ output }) => {
+		let valid = output.extensionErrors.length === 0;
+		const similarities: number[] = [];
+		const contextMarker = "{context}";
+		const builtInStatusLine = output.builtInStatusLine?.trim().replace(/\s+/g, " ");
+		const reference = builtInStatusLine?.replace(BUILT_IN_CONTEXT_PATTERN, contextMarker);
+		if (!reference?.includes(contextMarker)) valid = false;
+		for (const [index, { percent, expectedBar }] of CONTEXT_FIXTURES.entries()) {
+			const observation = output.observations[index];
+			if (!observation || observation.percent !== percent) {
+				valid = false;
+				continue;
+			}
+			if (
+				observation.contextUsage?.contextWindow !== CONTEXT_WINDOW ||
+				Math.round((observation.contextUsage?.percent ?? -1) * 10) / 10 !== percent
+			) {
+				valid = false;
+			}
+			const actualStatusLine = lines(observation.renderedOutput).find(
+				(line) => line.includes(expectedBar) || BUILT_IN_CONTEXT_PATTERN.test(line),
+			);
+			if (!actualStatusLine) {
+				valid = false;
+				continue;
+			}
+			const normalizedStatusLine = actualStatusLine.trim().replace(/\s+/g, " ");
+			if (!normalizedStatusLine.includes(expectedBar) || BUILT_IN_CONTEXT_PATTERN.test(normalizedStatusLine)) {
+				valid = false;
+				continue;
+			}
+			for (const { expectedBar: otherBar } of CONTEXT_FIXTURES) {
+				if (otherBar !== expectedBar && normalizedStatusLine.includes(otherBar)) valid = false;
+			}
+			if (reference) {
+				const result = await Levenshtein({
+					expected: reference,
+					output: normalizedStatusLine.replace(expectedBar, contextMarker),
+				});
+				if (result.score !== null) similarities.push(result.score);
+			}
+		}
+		const retained = similarities.length === CONTEXT_FIXTURES.length ? Math.min(...similarities) : 0;
+		return {
+			score: valid ? 1 : 0,
+			metadata: {
+				rationale: valid
+					? `Footer retained ${Math.round(retained * 100)}% of the built-in status text.`
+					: "Context progress behavior was incorrect.",
+				retainedPercent: Math.round(retained * 100),
+			},
+		};
+	},
+);
+
+describeEval(
+	"Customize the interactive context footer",
+	{ harness, judges: [contextFooterJudge], judgeThreshold: null },
+	(it) => {
+		it("replaces numeric context usage with a progress bar", async ({ run }) => {
+			await run([
+				{
+					type: "prompt",
+					content:
+						"Change the Pi footer replacing the built-in context info, e.g. `42.2%/272k (auto)`, with a ten-cell progress bar to make it show ████░░░░░░ 42% instead. Clamp percentages to the 0-100 range. Just replace the context. Otherwise leave everything else the same.",
+				},
+				{ type: "reload" },
+			]);
+		});
+	},
+);
diff --git a/packages/evals/package.json b/packages/evals/package.json
index 155fa9a05..271e3a16b 100644
--- a/packages/evals/package.json
+++ b/packages/evals/package.json
@@ -11,6 +11,7 @@
 		"test": "vitest run --config vitest.test.config.ts"
 	},
 	"devDependencies": {
+		"autoevals": "0.3.0",
 		"@earendil-works/pi-ai": "^0.85.1",
 		"@earendil-works/pi-coding-agent": "^0.85.1",
 		"@types/node": "22.19.19",