Give Agents access to Terminal output

.gitignore

@@ -17,3 +17,4 @@ release/
 apps/web/.playwright
 apps/web/playwright-report
 apps/web/src/components/__screenshots__
+.vitest-*

apps/web/src/components/ChatView.browser.tsx

@@ -21,6 +21,10 @@ import { afterAll, afterEach, beforeAll, beforeEach, describe, expect, it, vi }
 import { render } from "vitest-browser-react";
 
 import { useComposerDraftStore } from "../composerDraftStore";
+import {
+  INLINE_TERMINAL_CONTEXT_PLACEHOLDER,
+  type TerminalContextDraft,
+} from "../lib/terminalContext";
 import { isMacPlatform } from "../lib/utils";
 import { getRouter } from "../router";
 import { useStore } from "../store";
@@ -150,6 +154,25 @@ function createAssistantMessage(options: { id: MessageId; text: string; offsetSe
   };
 }
 
+function createTerminalContext(input: {
+  id: string;
+  terminalLabel: string;
+  lineStart: number;
+  lineEnd: number;
+  text: string;
+}): TerminalContextDraft {
+  return {
+    id: input.id,
+    threadId: THREAD_ID,
+    terminalId: `terminal-${input.id}`,
+    terminalLabel: input.terminalLabel,
+    lineStart: input.lineStart,
+    lineEnd: input.lineEnd,
+    text: input.text,
+    createdAt: NOW_ISO,
+  };
+}
+
 function createSnapshotForTargetUser(options: {
   targetMessageId: MessageId;
   targetText: string;
@@ -531,6 +554,13 @@ async function waitForComposerEditor(): Promise<HTMLElement> {
   );
 }
 
+async function waitForSendButton(): Promise<HTMLButtonElement> {
+  return waitForElement(
+    () => document.querySelector<HTMLButtonElement>('button[aria-label="Send message"]'),
+    "Unable to find send button.",
+  );
+}
+
 async function waitForInteractionModeButton(
   expectedLabel: "Chat" | "Plan",
 ): Promise<HTMLButtonElement> {
@@ -1011,6 +1041,166 @@ describe("ChatView timeline estimator parity (full app)", () => {
     }
   });
 
+  it("keeps backspaced terminal context pills removed when a new one is added", async () => {
+    const removedLabel = "Terminal 1 lines 1-2";
+    const addedLabel = "Terminal 2 lines 9-10";
+    useComposerDraftStore.getState().addTerminalContext(
+      THREAD_ID,
+      createTerminalContext({
+        id: "ctx-removed",
+        terminalLabel: "Terminal 1",
+        lineStart: 1,
+        lineEnd: 2,
+        text: "bun i\nno changes",
+      }),
+    );
+
+    const mounted = await mountChatView({
+      viewport: DEFAULT_VIEWPORT,
+      snapshot: createSnapshotForTargetUser({
+        targetMessageId: "msg-user-terminal-pill-backspace" as MessageId,
+        targetText: "terminal pill backspace target",
+      }),
+    });
+
+    try {
+      await vi.waitFor(
+        () => {
+          expect(document.body.textContent).toContain(removedLabel);
+        },
+        { timeout: 8_000, interval: 16 },
+      );
+
+      const composerEditor = await waitForComposerEditor();
+      composerEditor.focus();
+      composerEditor.dispatchEvent(
+        new KeyboardEvent("keydown", {
+          key: "Backspace",
+          bubbles: true,
+          cancelable: true,
+        }),
+      );
+
+      await vi.waitFor(
+        () => {
+          expect(useComposerDraftStore.getState().draftsByThreadId[THREAD_ID]).toBeUndefined();
+          expect(document.body.textContent).not.toContain(removedLabel);
+        },
+        { timeout: 8_000, interval: 16 },
+      );
+
+      useComposerDraftStore.getState().addTerminalContext(
+        THREAD_ID,
+        createTerminalContext({
+          id: "ctx-added",
+          terminalLabel: "Terminal 2",
+          lineStart: 9,
+          lineEnd: 10,
+          text: "git status\nOn branch main",
+        }),
+      );
+
+      await vi.waitFor(
+        () => {
+          const draft = useComposerDraftStore.getState().draftsByThreadId[THREAD_ID];
+          expect(draft?.terminalContexts.map((context) => context.id)).toEqual(["ctx-added"]);
+          expect(document.body.textContent).toContain(addedLabel);
+          expect(document.body.textContent).not.toContain(removedLabel);
+        },
+        { timeout: 8_000, interval: 16 },
+      );
+    } finally {
+      await mounted.cleanup();
+    }
+  });
+
+  it("disables send when the composer only contains an expired terminal pill", async () => {
+    const expiredLabel = "Terminal 1 line 4";
+    useComposerDraftStore.getState().addTerminalContext(
+      THREAD_ID,
+      createTerminalContext({
+        id: "ctx-expired-only",
+        terminalLabel: "Terminal 1",
+        lineStart: 4,
+        lineEnd: 4,
+        text: "",
+      }),
+    );
+
+    const mounted = await mountChatView({
+      viewport: DEFAULT_VIEWPORT,
+      snapshot: createSnapshotForTargetUser({
+        targetMessageId: "msg-user-expired-pill-disabled" as MessageId,
+        targetText: "expired pill disabled target",
+      }),
+    });
+
+    try {
+      await vi.waitFor(
+        () => {
+          expect(document.body.textContent).toContain(expiredLabel);
+        },
+        { timeout: 8_000, interval: 16 },
+      );
+
+      const sendButton = await waitForSendButton();
+      expect(sendButton.disabled).toBe(true);
+    } finally {
+      await mounted.cleanup();
+    }
+  });
+
+  it("warns when sending text while omitting expired terminal pills", async () => {
+    const expiredLabel = "Terminal 1 line 4";
+    useComposerDraftStore.getState().addTerminalContext(
+      THREAD_ID,
+      createTerminalContext({
+        id: "ctx-expired-send-warning",
+        terminalLabel: "Terminal 1",
+        lineStart: 4,
+        lineEnd: 4,
+        text: "",
+      }),
+    );
+    useComposerDraftStore
+      .getState()
+      .setPrompt(THREAD_ID, `yoo${INLINE_TERMINAL_CONTEXT_PLACEHOLDER}waddup`);
+
+    const mounted = await mountChatView({
+      viewport: DEFAULT_VIEWPORT,
+      snapshot: createSnapshotForTargetUser({
+        targetMessageId: "msg-user-expired-pill-warning" as MessageId,
+        targetText: "expired pill warning target",
+      }),
+    });
+
+    try {
+      await vi.waitFor(
+        () => {
+          expect(document.body.textContent).toContain(expiredLabel);
+        },
+        { timeout: 8_000, interval: 16 },
+      );
+
+      const sendButton = await waitForSendButton();
+      expect(sendButton.disabled).toBe(false);
+      sendButton.click();
+
+      await vi.waitFor(
+        () => {
+          expect(document.body.textContent).toContain(
+            "Expired terminal context omitted from message",
+          );
+          expect(document.body.textContent).not.toContain(expiredLabel);
+          expect(document.body.textContent).toContain("yoowaddup");
+        },
+        { timeout: 8_000, interval: 16 },
+      );
+    } finally {
+      await mounted.cleanup();
+    }
+  });
+
   it("shows a pointer cursor for the running stop button", async () => {
     const mounted = await mountChatView({
       viewport: DEFAULT_VIEWPORT,

apps/web/src/components/ChatView.logic.test.ts

@@ -0,0 +1,69 @@
+import { ThreadId } from "@t3tools/contracts";
+import { describe, expect, it } from "vitest";
+
+import { buildExpiredTerminalContextToastCopy, deriveComposerSendState } from "./ChatView.logic";
+
+describe("deriveComposerSendState", () => {
+  it("treats expired terminal pills as non-sendable content", () => {
+    const state = deriveComposerSendState({
+      prompt: "\uFFFC",
+      imageCount: 0,
+      terminalContexts: [
+        {
+          id: "ctx-expired",
+          threadId: ThreadId.makeUnsafe("thread-1"),
+          terminalId: "default",
+          terminalLabel: "Terminal 1",
+          lineStart: 4,
+          lineEnd: 4,
+          text: "",
+          createdAt: "2026-03-17T12:52:29.000Z",
+        },
+      ],
+    });
+
+    expect(state.trimmedPrompt).toBe("");
+    expect(state.sendableTerminalContexts).toEqual([]);
+    expect(state.expiredTerminalContextCount).toBe(1);
+    expect(state.hasSendableContent).toBe(false);
+  });
+
+  it("keeps text sendable while excluding expired terminal pills", () => {
+    const state = deriveComposerSendState({
+      prompt: `yoo \uFFFC waddup`,
+      imageCount: 0,
+      terminalContexts: [
+        {
+          id: "ctx-expired",
+          threadId: ThreadId.makeUnsafe("thread-1"),
+          terminalId: "default",
+          terminalLabel: "Terminal 1",
+          lineStart: 4,
+          lineEnd: 4,
+          text: "",
+          createdAt: "2026-03-17T12:52:29.000Z",
+        },
+      ],
+    });
+
+    expect(state.trimmedPrompt).toBe("yoo  waddup");
+    expect(state.expiredTerminalContextCount).toBe(1);
+    expect(state.hasSendableContent).toBe(true);
+  });
+});
+
+describe("buildExpiredTerminalContextToastCopy", () => {
+  it("formats clear empty-state guidance", () => {
+    expect(buildExpiredTerminalContextToastCopy(1, "empty")).toEqual({
+      title: "Expired terminal context won't be sent",
+      description: "Remove it or re-add it to include terminal output.",
+    });
+  });
+
+  it("formats omission guidance for sent messages", () => {
+    expect(buildExpiredTerminalContextToastCopy(2, "omitted")).toEqual({
+      title: "Expired terminal contexts omitted from message",
+      description: "Re-add it if you want that terminal output included.",
+    });
+  });
+});

apps/web/src/components/ChatView.logic.ts

@@ -4,6 +4,11 @@ import { randomUUID } from "~/lib/utils";
 import { getAppModelOptions } from "../appSettings";
 import { type ComposerImageAttachment, type DraftThreadState } from "../composerDraftStore";
 import { Schema } from "effect";
+import {
+  filterTerminalContextsWithText,
+  stripInlineTerminalContextPlaceholders,
+  type TerminalContextDraft,
+} from "../lib/terminalContext";
 
 export const LAST_INVOKED_SCRIPT_BY_PROJECT_KEY = "t3code:last-invoked-script-by-project";
 const WORKTREE_BRANCH_PREFIX = "t3code";
@@ -123,3 +128,44 @@ export function getCustomModelOptionsByProvider(settings: {
     codex: getAppModelOptions("codex", settings.customCodexModels),
   };
 }
+
+export function deriveComposerSendState(options: {
+  prompt: string;
+  imageCount: number;
+  terminalContexts: ReadonlyArray<TerminalContextDraft>;
+}): {
+  trimmedPrompt: string;
+  sendableTerminalContexts: TerminalContextDraft[];
+  expiredTerminalContextCount: number;
+  hasSendableContent: boolean;
+} {
+  const trimmedPrompt = stripInlineTerminalContextPlaceholders(options.prompt).trim();
+  const sendableTerminalContexts = filterTerminalContextsWithText(options.terminalContexts);
+  const expiredTerminalContextCount =
+    options.terminalContexts.length - sendableTerminalContexts.length;
+  return {
+    trimmedPrompt,
+    sendableTerminalContexts,
+    expiredTerminalContextCount,
+    hasSendableContent:
+      trimmedPrompt.length > 0 || options.imageCount > 0 || sendableTerminalContexts.length > 0,
+  };
+}
+
+export function buildExpiredTerminalContextToastCopy(
+  expiredTerminalContextCount: number,
+  variant: "omitted" | "empty",
+): { title: string; description: string } {
+  const count = Math.max(1, Math.floor(expiredTerminalContextCount));
+  const noun = count === 1 ? "Expired terminal context" : "Expired terminal contexts";
+  if (variant === "empty") {
+    return {
+      title: `${noun} won't be sent`,
+      description: "Remove it or re-add it to include terminal output.",
+    };
+  }
+  return {
+    title: `${noun} omitted from message`,
+    description: "Re-add it if you want that terminal output included.",
+  };
+}