feat(cli): add agent kill in agent console

docs/ai/design/2026-06-01-feature-agent-console-kill.md

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+---
+phase: design
+title: Agent Console Kill Design
+description: Technical design for confirmed kill support in agent console
+---
+
+# System Design & Architecture
+
+## Architecture Overview
+
+```mermaid
+graph TD
+    User["User presses K"] --> ConsoleApp["ConsoleAppShell"]
+    ConsoleApp --> Confirm["Kill confirmation overlay"]
+    Confirm -->|Esc/n| Cancel["Close overlay"]
+    Confirm -->|Enter/y| RunAction["runAction({ type: kill })"]
+    RunAction --> KillCmd["agent kill <name>"]
+    KillCmd --> AgentManager["AgentManager.listAgents/resolveAgent"]
+    KillCmd --> ProcessKill["process.kill(pid, SIGTERM)"]
+    KillCmd --> Registry["AgentRegistry.lookup(name)"]
+    Registry --> TmuxSession{"tmuxSession?"}
+    TmuxSession -->|yes| TmuxManager["TmuxManager.killSession"]
+    TmuxSession -->|no| Done["Success"]
+```
+
+Kill support follows the existing console action pattern: the TUI handles key input and presentation, while the destructive operation runs through a CLI subprocess. The CLI receives the agent name, resolves it against the current live agent list, sends `SIGTERM` to the PID, and cleans up the registry-backed tmux session when available.
+
+## Data Models
+
+- `ConsoleAction`
+  - Add `{ type: 'kill'; agentName: string }`.
+- `AgentInfo`
+  - Existing selected agent data supplies `name`, `pid`, and optionally `tmuxSession`.
+- `RegistryEntry`
+  - `AgentRegistry.lookup(name)` supplies a preserved `tmuxSession` when the live adapter did not populate it.
+
+## API Design
+
+- Add CLI command: `ai-devkit agent kill <name>`
+  - Resolves `<name>` like `open`/`send`.
+  - Rejects no-match and ambiguous matches with existing agent-list messaging patterns.
+  - Calls a reusable service function for process/tmux cleanup.
+- Add service function: `killAgent(agent, deps)`
+  - Inputs: selected `AgentInfo`, `AgentRegistry`, `TmuxManager`, optional signal.
+  - Behavior: `process.kill(agent.pid, 'SIGTERM')`, then `tmux.killSession(session)` when a session name exists.
+
+## Component Breakdown
+
+| Component | Change |
+|-----------|--------|
+| `ConsoleAppShell` | Track pending kill confirmation and handle `K`, `y`, `Enter`, `n`, `Esc` |
+| New `KillConfirmDialog` | Render centered absolute-positioned confirmation overlay |
+| `StatusFooter` | Include `K kill` in key hints |
+| `runAction` | Add `kill` action that spawns `agent kill <name>` |
+| `agent.service.ts` | Add kill service with tmux cleanup |
+| `commands/agent.ts` | Add `agent kill` command |
+
+## Design Decisions
+
+- Keep lowercase `k` as up navigation and use uppercase `K` for kill.
+- Require confirmation before invoking the subprocess.
+- Render the confirmation as an absolute-positioned overlay so the list, preview, input, and footer keep their existing dimensions.
+- Use subprocess actions consistently with existing console `open` and `send`.
+- Resolve tmux session from the registry as a fallback because `AgentInfo` may be adapter-derived and not always contain registry metadata.
+- Treat missing/already-ended process as non-fatal enough to continue tmux cleanup; the user action intent is to ensure the selected agent is stopped.
+
+## Non-Functional Requirements
+
+- The confirmation overlay must be keyboard-only, absolute-positioned, and not resize the main console panes.
+- TUI errors should appear as transient messages.
+- Kill must not take over stdin/stdout from Ink.
+- Tests should cover both process-only and tmux-backed agents.

docs/ai/implementation/2026-06-01-feature-agent-console-kill.md

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+---
+phase: implementation
+title: Agent Console Kill Implementation
+description: Implementation notes for confirmed kill support in agent console
+---
+
+# Implementation Guide
+
+## Development Setup
+
+- Feature worktree: `.worktrees/feature-agent-console-kill`
+- Branch: `feature-agent-console-kill`
+- Dependency bootstrap: `npm ci` completed. Husky prepare could not lock the main repo git config from the sandbox, but dependency install exited successfully.
+
+## Code Structure
+
+- `packages/cli/src/services/agent/agent.service.ts`
+  - Added `killAgent()` service.
+- `packages/cli/src/commands/agent.ts`
+  - Added `agent kill <name>`.
+- `packages/cli/src/tui/console/actions/types.ts`
+  - Added `kill` console action.
+- `packages/cli/src/tui/console/actions/runAction.ts`
+  - Dispatches kill through a CLI subprocess.
+- `packages/cli/src/tui/console/ConsoleApp.tsx`
+  - Handles uppercase `K`, confirmation state, and kill result messages.
+- `packages/cli/src/tui/console/KillConfirmDialog.tsx`
+  - New Ink confirmation dialog.
+- `packages/cli/src/tui/console/StatusFooter.tsx`
+  - Documents `K kill`.
+
+## Implementation Notes
+
+### Core Features
+
+- `killAgent()` sends `SIGTERM` to the selected agent PID.
+- `killAgent()` looks up the registry entry by agent name and kills the stored `tmuxSession` when present.
+- `ESRCH` process-kill errors are treated as already stopped so tmux cleanup still runs.
+- `agent kill <name>` uses existing list/resolve behavior and reuses the no-match/ambiguous-match messaging style from existing commands.
+- `agent console` keeps lowercase `k` navigation and uses uppercase `K` to open a confirmation dialog.
+- Confirming with `Enter` or `y` dispatches `agent kill <name>` through `runAction`; cancelling with `Esc` or `n` closes the dialog without side effects.
+- `KillConfirmDialog` is rendered inside an absolute-positioned `Box` centered from terminal dimensions, so opening it does not shrink the agent list, preview pane, input box, or footer.
+
+### Patterns & Best Practices
+
+- Console actions remain subprocess-based so the Ink TUI keeps terminal control.
+- Tmux cleanup is centralized in the service layer, not the TUI.
+- Process killing is dependency-injected in tests via `killProcess`.
+
+## Error Handling
+
+- CLI command resolution failures return visible `ui.error`/`ui.info` messages and do not call `killAgent`.
+- Non-`ESRCH` process kill errors propagate through the existing `withErrorHandler` path.
+- TUI action failures are shown as transient footer errors.
+
+## Verification Evidence
+
+- `npx ai-devkit@latest lint --feature agent-console-kill` exited 0.
+- `npm run build` in `packages/agent-manager` exited 0.
+- `npm run build` in `packages/cli` exited 0.
+- `npm run lint` in `packages/cli` exited 0.
+- `npx vitest run src/__tests__/services/agent/agent.service.test.ts src/__tests__/commands/agent.test.ts src/__tests__/tui/console/actions/runAction.test.ts src/__tests__/tui/console/computeLayout.test.ts` exited 0 with 90 passing tests.
+
+## Phase 6 Implementation Check
+
+### Alignment Status
+
+- Requirements alignment: pass.
+  - Uppercase `K` opens kill confirmation.
+  - Lowercase `k` navigation remains unchanged.
+  - Confirmed kill dispatches through `agent kill <name>`.
+  - The kill service sends `SIGTERM` and kills registry-backed `tmuxSession` when present.
+  - Console errors are surfaced as transient messages.
+- Design alignment: pass.
+  - `ConsoleAction` includes `kill`.
+  - `runAction` spawns `agent kill <name>` with piped stdio.
+  - `agent kill` resolves agents through `AgentManager.listAgents()` and `resolveAgent()`.
+  - `killAgent()` centralizes process and tmux cleanup.
+  - `KillConfirmDialog` is absolute-positioned so it does not resize the main UI panes.
+
+### File-by-File Notes
+
+- `packages/cli/src/services/agent/agent.service.ts`: matches design. `ESRCH` is handled as already stopped, while unexpected process errors still propagate.
+- `packages/cli/src/commands/agent.ts`: matches existing command resolution patterns for no agents, no match, ambiguous match, and success.
+- `packages/cli/src/tui/console/ConsoleApp.tsx`: matches the keyboard flow. Confirmation handling has priority over normal shortcuts while pending.
+- `packages/cli/src/tui/console/KillConfirmDialog.tsx`: matches the overlay design and does not own kill behavior.
+- `packages/cli/src/tui/console/actions/*`: matches existing subprocess action pattern.
+- `packages/cli/src/tui/console/StatusFooter.tsx`: documents `K kill`.
+
+### Deviations and Follow-Ups
+
+- No blocking deviations found.
+- Follow-up for Phase 7: add or manually execute coverage for live Ink key handling (`k`, `K`, `n`/`Esc`, `Enter`/`y`) and the managed tmux smoke test.

docs/ai/planning/2026-06-01-feature-agent-console-kill.md

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+---
+phase: planning
+title: Agent Console Kill Plan
+description: Task breakdown for confirmed kill support in agent console
+---
+
+# Project Planning & Task Breakdown
+
+## Milestones
+
+- [x] Milestone 1: CLI kill service and command implemented.
+- [x] Milestone 2: Console confirmation UI and `K` keybinding implemented.
+- [x] Milestone 3: Tests, docs, and verification complete.
+
+## Task Breakdown
+
+### Phase 1: CLI Kill Path
+- [x] Task 1.1: Add `killAgent` service that sends `SIGTERM` and kills tmux session when available.
+- [x] Task 1.2: Add `agent kill <name>` command with no-match and ambiguous-match handling.
+- [x] Task 1.3: Add command/service tests for process kill and tmux cleanup.
+
+### Phase 2: Console Integration
+- [x] Task 2.1: Extend console action types and `runAction` with `kill`.
+- [x] Task 2.2: Add confirmation overlay component.
+- [x] Task 2.3: Wire uppercase `K` to open confirmation while preserving lowercase `k` navigation.
+- [x] Task 2.4: Show kill result/error through transient footer messages.
+
+### Phase 3: Verification
+- [x] Task 3.1: Update footer/docs hints.
+- [x] Task 3.2: Run focused tests.
+- [x] Task 3.3: Run build/typecheck for touched packages.
+
+## Dependencies
+
+- Existing `AgentManager.resolveAgent` behavior for name resolution.
+- Existing `TmuxManager.killSession` behavior for tmux cleanup.
+- Existing console subprocess action pattern.
+
+## Timeline & Estimates
+
+- CLI kill path: 30-45 minutes.
+- Console integration: 45-60 minutes.
+- Tests and verification: 30-45 minutes.
+
+## Risks & Mitigation
+
+- Risk: agent process exits before kill is invoked.
+  - Mitigation: tolerate `ESRCH`/already-gone process errors and still attempt tmux cleanup.
+- Risk: adapter-derived agent lacks `tmuxSession`.
+  - Mitigation: fallback to registry lookup by agent name.
+- Risk: confirmation input conflicts with chat input.
+  - Mitigation: ignore `K` while input focus is active and give dialog input handling priority.
+
+## Resources Needed
+
+- Existing CLI and Ink test patterns.
+- `TmuxManager` and `AgentRegistry` utilities from `@ai-devkit/agent-manager`.

docs/ai/requirements/2026-06-01-feature-agent-console-kill.md

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+---
+phase: requirements
+title: Agent Console Kill
+description: Add confirmed kill support to the interactive agent console
+---
+
+# Requirements & Problem Understanding
+
+## Problem Statement
+
+Developers can monitor, open, and message agents from `ai-devkit agent console`, but cannot stop a selected agent from the same interface. Stopping a managed agent currently requires leaving the console and using external process or tmux commands. This is slower and risks leaving the managed tmux session behind.
+
+## Goals & Objectives
+
+- Add a keyboard-driven kill action to `agent console`.
+- Use uppercase `K` for kill so lowercase `k` remains upward navigation.
+- Show a confirmation pop-up before killing the selected agent.
+- Stop the selected agent process.
+- If the selected agent has a non-empty `tmuxSession`, kill that tmux session as part of the same action.
+- Refresh console state after a successful kill so the stopped agent disappears once discovery/registry pruning observes it.
+
+## Non-Goals
+
+- Do not change lowercase `j/k` navigation.
+- Do not add bulk kill support.
+- Do not add force/timeout tuning in this feature.
+- Do not expose kill for historical sessions.
+
+## User Stories & Use Cases
+
+- As a developer using `agent console`, I want to press `K` on the selected agent and confirm the action so I can stop the agent without leaving the console.
+- As a developer using managed tmux agents, I want the tmux session cleaned up when the agent is killed so that no detached tmux session remains.
+- As a developer, I want accidental `K` presses to be reversible at the confirmation prompt.
+
+## Success Criteria
+
+- Pressing lowercase `k` still moves the selection up.
+- Pressing uppercase `K` with a selected agent opens a confirmation pop-up.
+- Confirming the pop-up invokes a kill action for the selected agent.
+- Cancelling the pop-up leaves the agent and tmux session untouched.
+- The kill action sends a termination signal to the agent PID.
+- The kill action kills `tmuxSession` when the selected agent has one.
+- The console footer documents `K kill`.
+- Errors are shown as transient console errors rather than crashing the TUI.
+
+## Constraints & Assumptions
+
+- The console is an Ink TUI; the confirmation should be implemented with existing Ink components, not an external terminal prompt.
+- Existing console actions are subprocess-based through `runAction`; kill should follow the same pattern so the TUI keeps control of the terminal.
+- `tmuxSession` is available from `AgentInfo` for registry-backed managed agents.
+- A regular `SIGTERM` is the default process stop signal for this feature.
+- Memory search was unavailable due to a local `better-sqlite3` Node ABI mismatch, so this scope is based on existing repo docs/code and user clarification.
+
+## Questions & Open Items
+
+- Resolved: shortcut is uppercase `K`, not lowercase `k`.

docs/ai/testing/2026-06-01-feature-agent-console-kill.md

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+---
+phase: testing
+title: Agent Console Kill Testing
+description: Test plan for confirmed kill support in agent console
+---
+
+# Testing Strategy
+
+## Test Coverage Goals
+
+- Unit coverage for new kill service branches.
+- Command coverage for `agent kill` resolution behavior.
+- Console/action coverage for kill action dispatch and confirmation keyboard behavior where practical.
+- Manual TUI smoke test for the confirmation overlay.
+
+## Unit Tests
+
+### Agent Kill Service
+- [x] Kills the selected agent PID with `SIGTERM`.
+- [x] Kills the registry `tmuxSession` when present.
+- [x] Falls back to `AgentRegistry.lookup(name).tmuxSession`.
+- [x] Continues tmux cleanup when the process is already gone.
+- [x] Does not call tmux when no tmux session exists.
+
+### Console Actions
+- [x] `runAction({ type: 'kill' })` spawns `agent kill <name>`.
+- [x] Existing open/send action behavior is unchanged.
+
+### Console UI
+- [ ] Pressing lowercase `k` navigates up.
+- [ ] Pressing uppercase `K` opens confirmation for the selected agent.
+- [x] Confirmation renders as an overlay without changing computed pane dimensions.
+- [x] `Esc`/`n` maps to cancel while kill confirmation is pending.
+- [x] `Enter`/`y` maps to confirm while kill confirmation is pending.
+- [ ] Full live Ink key handling (`k`, `K`, cancel, confirm) is manually smoke-tested in a TTY.
+
+## Integration Tests
+
+- [x] `agent kill <name>` resolves an exact or unique partial agent and calls the kill service.
+- [x] `agent kill <name>` reports no-match and ambiguous-match cases without killing anything.
+- [x] `agent console` footer includes `K kill`.
+
+## Manual Testing
+
+- [ ] Start a managed tmux agent with `ai-devkit agent start`.
+- [ ] Open `ai-devkit agent console`.
+- [ ] Select the agent and press lowercase `k`; verify selection moves up.
+- [ ] Press uppercase `K`; verify confirmation appears.
+- [ ] Press `n`; verify the agent remains.
+- [ ] Press uppercase `K` again, then `Enter`; verify the agent process exits and the tmux session is gone.
+
+## Test Reporting & Coverage
+
+- Run focused package tests for CLI and agent-manager changes.
+- Run build or typecheck for touched packages before completion.
+
+## Verification Results
+
+- `npx vitest run src/__tests__/tui/console/hooks/useKillAgentAction.test.ts src/__tests__/tui/console/actions/runAction.test.ts src/__tests__/tui/console/computeLayout.test.ts src/__tests__/commands/agent.test.ts src/__tests__/services/agent/agent.service.test.ts`: exit 0, 97 tests passed.
+- `npx vitest run src/__tests__/tui/console/hooks/useKillAgentAction.test.ts src/__tests__/tui/console/actions/runAction.test.ts src/__tests__/services/agent/agent.service.test.ts --coverage --coverage.include=src/tui/console/hooks/useKillAgentAction.ts --coverage.include=src/tui/console/actions/runAction.ts --coverage.include=src/services/agent/agent.service.ts`: exit 0, 36 tests passed, touched-module coverage 84.58% statements / 94.73% branches / 92.85% functions / 84.58% lines.
+- `npm run build` in `packages/agent-manager`: exit 0.
+- `npm run build` in `packages/cli`: exit 0.
+- `npm run lint` in `packages/cli`: exit 0.
+
+## Coverage Notes
+
+- Full CLI coverage with a focused test subset exits non-zero because Vitest includes the entire CLI source tree and enforces global 60% thresholds against unrelated unexecuted modules.
+- Scoped coverage for touched kill/action/service modules exits zero.
+- The package does not currently include an Ink or React hook test renderer; full keypress behavior remains covered by manual TTY smoke testing.