Render Agent request failures in the TUI

[moirahuang]

Description

Surface Agent Mode request failures in the headless TUI using presentation logic shared with the GUI. Out-of-credits failures match the supplied TUI design with exact copy, semantic styling, and clickable plan/BYOK actions inside the transcript while keeping the persistent footer metadata-only.

Implementation plan: https://staging.warp.dev/drive/notebook/Q4amHEjF0oDbPPvwB5t9Y2

Shared GUI/TUI surfaces

flowchart LR
    Error["RenderableAIError"] --> Presentation["Shared presentation layer<br/>failed_output_presentation<br/>FailedOutputPresentation"]
    Policy["Shared policy and state<br/>UserWorkspaces<br/>AIRequestUsageModel"] --> Presentation
    Usage["Shared usage-notice predicate<br/>should_show_failed_output_usage_notice"] --> GUI
    Usage --> TUI
    Presentation --> GUI["GUI renderer<br/>render_failed_output"]
    Presentation --> TUI["TUI renderer<br/>TuiAIBlock::sections"]
    GUI --> GUIControls["GUI-specific controls<br/>upgrade and settings actions"]
    TUI --> TUIRows["TUI-specific composition<br/>cell rows and TuiHoverable links"]

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Linked Issue

N/A

• The linked issue is labeled ready-to-spec or ready-to-implement.
• Where appropriate, screenshots or a short video of the implementation are included below (especially for user-visible or UI changes).

Testing

• cargo nextest run -p warp_tui (429 passed)
• cargo check -p warp -p warp_tui --lib
• cargo clippy -p warp -p warp_tui --all-targets -- -D warnings
• ./script/format
• git diff --check
• Row-exact cell-buffer tests cover Figma copy, spacing, semantic styles, underlines, both link targets, conditional BYOK rendering, partial output ordering, and footer absence.
• I have manually tested my changes locally with ./script/run

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

CHANGELOG-IMPROVEMENT: Show actionable Agent Mode request failures in the headless TUI.

Co-Authored-By: Oz oz-agent@warp.dev

[oz-for-oss]

@moirahuang

I'm starting a first review of this pull request.

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[moirahuang]

• Render Agent request failures in the TUI #14044 👈 (View in Graphite)
• master

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[oz-for-oss]

Overview

This PR factors failed Agent Mode request presentation into a shared helper and adds TUI rendering for failed agent requests, including quota, invalid API key, context-window, AWS Bedrock credential, and usage-notice states. No approved spec context was provided, and I did not find security issues in the changed code paths.

Concerns

• This is user-facing TUI behavior, but the PR description does not include the required TUI visual evidence. Please attach a terminal transcript, render_to_lines / TuiBuffer::to_lines snapshot output, or a ./script/run-tui capture demonstrating the failure states end to end.

Verdict

Found: 0 critical, 1 important, 0 suggestions

Request changes

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[harryalbert]

nice

[harryalbert]

seeing the TUI ui framework come together such that we can add this without new elements is very satisfying

[moirahuang]

for sure, this PR stands on the shoulder of giants