Create Vibe Feature

Use this skill when implementing Vibe feature work. Keep changes scoped, architecture-aware, and consistent with nearby code.

App Areas

Area	Role	Path
Core engine	Agent loop, domain events, tools, LLM backends, config, sessions, skills, hooks, telemetry types, shared models	`vibe/core/`
App server	Session, turn, config and persistence, tools, and callback ownership; typed JSON-RPC methods and notifications consumed by the TUI and ACP	`vibe/app_server/`
Terminal UI	Ratatui TUI, thin client over `vibe-app-server`: interactive terminal UX, widgets, slash commands, manual shell commands, voice UI, local user affordances	`vibe/cli-rust/`
Launcher and audio	The `vibe` console script that execs the TUI; voice, narrator and audio helpers used by ACP	`vibe/cli/`
ACP bridge	Agent Client Protocol session, tool, terminal, title, and content translation	`vibe/acp/`
Setup	Auth and the Textual onboarding wizard behind `vibe-acp --setup`	`vibe/setup/`
Tests	Python unit, integration and e2e tests, stubs and fixtures; the TUI's tests live in `vibe/cli-rust/tests/` and `client-e2e/`	`tests/`

Architecture Routing

Before implementation, read the matching ADRs:

Architecture principles, module boundaries, startup/runtime speed, simple changes: docs/adr/0001-architecture-principles.md
Core engine vs delivery surfaces: docs/adr/0002-core-engine-and-delivery-surfaces.md
Agent loop orchestration, streaming, events, cancellation, responsiveness: docs/adr/0003-event-driven-agent-loop.md
Tool contracts, permissions, output, UI metadata, adapters: docs/adr/0004-typed-permissioned-tools.md
Config models, layering, defaults, migrations, reloads: docs/adr/0005-layered-configuration.md
Session logging, resume, rewind, transcript metadata, migrations: docs/adr/0006-local-sessions.md
Skills, agents, subagents, hooks, MCP, connectors, custom tools, discovery: docs/adr/0007-extension-mechanisms.md
Feature work, telemetry events, analytics properties, instrumentation verification: docs/adr/0008-feature-instrumentation.md
App-server RPCs, notifications, and delivery adapters: docs/adr/0009-app-server-boundary.md
Rust CLI thin-client boundary, unidirectional state, bounded resources: docs/adr/0016-rust-cli-delivery-surface.md

If a change fits the current code but conflicts with ADR direction, flag it to the user before implementing.

Workflow

Read README.md, AGENTS.md, and the nearest relevant source files before editing.
Identify the owning area. Keep UI behavior in vibe/cli-rust, ACP translation in vibe/acp, setup flow in vibe/setup, server-owned behavior behind an app-server method or notification in vibe/app_server (per ADR 0009), and reusable engine behavior in vibe/core. For terminal UI changes, see "Terminal UI changes" in the Vibe project AGENTS.md (next to pyproject.toml).
Study one or two existing features with the same shape before adding new files. Match naming, model placement, port/adapters, tests, and error patterns.
Prefer a small change in the owning module. Add a port or abstraction only when it protects a meaningful boundary or makes replacement/testing easier.
For feature work, plan telemetry with instrument-feature-analytics before writing tracking code.
Keep startup and interactive latency in mind. Avoid eager imports, broad scans, and network or subprocess work unless the configured feature needs them.
Update docs or built-in skill guidance when the feature changes user-visible CLI behavior, config, commands, agents, persistence, or discovery.

Tools

When adding or modifying a tool:

Subclass BaseTool from vibe/core/tools/base.py with a Pydantic args model and a BaseToolConfig generic parameter.
Implement async def run(args, ctx: InvokeContext) and yield events progressively.
Raise ToolError for user-facing failures; raise ToolPermissionError for authorization failures.
Declare permission with ToolPermission (ALWAYS / ASK / NEVER); honor it consistently.

Consistency Checks

Core code should not import Textual, ACP schemas, setup UI, or other delivery-surface details.
Surface code should adapt core events/models instead of reaching into private core state.
External data should enter through Pydantic validation, typed events, tool args/results, config models, or explicit ports.
Tools should follow BaseTool with typed args, result, config, state, and permission behavior.
Tests should mirror the source layout and use existing fixtures or tests/stubs/Fake* doubles.

Verification

After Python changes, run:

uv run ruff format .
uv run ruff check --fix .

For behavior changes, run the narrowest relevant tests first, then broader checks if the change touches shared contracts:

uv run pytest <path-or-test>
uv run pyright

For terminal UI changes, run the Rust gates from vibe/cli-rust/AGENTS.md (make test_rust QUIET=1, then the affected goldens or make test QUIET=1).