feat(cli): add experimental agents TUI by ibetitsmike · Pull Request #24150 · coder/coder

ibetitsmike · 2026-04-08T14:48:34Z

This PR was authored by Mux on behalf of Mike.

Adds coder exp agents, an interactive terminal UI for managing Coder AI agent chats. Built with bubbletea/lipgloss/glamour, the TUI provides parity with the web dashboard for chat management, model selection, and real-time tool execution visibility.

What it does

Chat list view: tree-based navigation with nested subagent expansion, search filtering, windowed scrolling, and pagination.
Active chat view: viewport-based transcript with markdown rendering, WebSocket streaming, and a text input composer for sending messages.
Model picker overlay: cached model catalog with fuzzy selection.
Diff drawer overlay: git changes inspection with unified diff rendering.
Tool call rendering: humanized argument summaries, consecutive duplicate collapsing, and status indicators.

Key implementation details

Session lifecycle uses a monotonic chatGeneration counter so async responses from stale sessions are dropped on chat switch.
Draft mode guards prevent duplicate chat creation on double-Enter.
Error and loading states render inline without collapsing the TUI chrome.
Glamour renderer access is mutex-protected (not thread-safe).
Intentional WebSocket close is distinguished from dropped connections to prevent spurious reconnects.

Testing

~220 unit tests covering rendering, state transitions, keyboard dispatch, and edge cases. 4-scenario PTY-based E2E suite covers boot, navigation, search, and direct chat open.

14 new files, ~7,400 lines added.

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cli/exp_agents.go

cli/exp_agents_model.go

ibetitsmike · 2026-04-08T16:15:15Z

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cli/exp_agents_chat.go

ibetitsmike · 2026-04-08T16:47:49Z

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cli/exp_agents_chat.go

cli/exp_agents_render.go

ibetitsmike · 2026-04-08T17:23:19Z

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cli/exp_agents_chat.go

ibetitsmike · 2026-04-08T17:41:21Z

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cli/exp_agents_chat.go

cli/exp_agents_model.go

ibetitsmike · 2026-04-08T18:12:30Z

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cli/exp_agents_chat.go

ibetitsmike · 2026-04-08T18:28:59Z

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cli/exp_agents_chat.go

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ibetitsmike · 2026-04-08T18:57:26Z

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cli/exp_agents_render.go

cli/exp_agents_chat.go

ibetitsmike · 2026-04-08T19:34:39Z

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cli/exp_agents_chat.go

ibetitsmike · 2026-04-08T19:53:44Z

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cli/exp_agents_render.go

cli/exp_agents_model.go

ibetitsmike · 2026-04-08T20:15:34Z

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ibetitsmike added 30 commits April 8, 2026 14:46

feat(cli): scaffold exp chats command group with stubs

d20eab3

feat(cli): implement exp chats subcommands

a16fd2b

feat(cli): implement exp chats streaming commands

c234351

feat(cli): implement exp chats interrupt and diff

883d3eb

feat(cli): implement exp chats transcript

1efe526

fix(cli): fix exp chats test assertions

abe00a6

fix(cli): stabilize exp chats tests

29c6060

refactor(cli): migrate exp chats to ExperimentalClient

d887994

feat(cli): add chats tui foundation

f7d3a09

feat(cli): wire chat tui foundation state

013ecba

feat(cli): implement chat tui chat reducer

7a21e8a

feat(cli): implement chat TUI renderers

a60ad40

test(cli): add exp chats tui render coverage

ba2293a

test(cli): add chat tui reducer coverage

5cbe107

fix(cli): fix TUI keyboard input bugs

4dd40ac

fix(cli): handle Ctrl shortcuts before composer input

45f1544

fix(cli): use alt screen and fix help bar truncation in TUI

0a60348

refactor(cli): rename exp chats tui to exp agents

d13e3ec

fix(cli): prevent OSC background color query in agents TUI

aa2d82c

fix(cli): cache exp agents tui rendering

22227b9

test(cli): cover exp agents caching

eeca70a

test(cli): fix SelectionStylingDoesNotPoisonCache assertion

828ad21

fix(cli): tidy exp agents tool rendering

63bfaef

fix(cli): merge tool call results in agents tui

eac1a5f

fix(cli): keep selected chat visible

bf6912a

test(cli): cover workspace render summaries

510b7f8

fix(cli): restore exp agents chat viewport follow

966b89c

fix(cli): nest subagent chats in exp agents list

2fabaf0

fix(cli): merge tool-call blocks with empty toolID

9b7be24

fix(cli): improve exp agents chat scrolling

3855255

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fix(cli): accept string chat model overrides

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fix(cli): start stream on empty chat history

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fix(cli): preserve model overrides and adjacent tool merges

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fix(cli): clear stream accumulator before reconnect

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fix(cli): prioritize interrupt over tab and guard diff drawer

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fix(cli): clear error banner on successful message send

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fix(cli): reconnect waiting chats and window model picker

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fix(cli): sanitize chat rendering and restore tab focus

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fix(cli): restart stream after send when disconnected

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fix(cli): sanitize diff content and resolve draft sessions

f55238a

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ibetitsmike commented Apr 8, 2026

What it does

Key implementation details

Testing

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