a3s

The umbrella CLI for the A3S platform.

a3s <tool> [args...] runs the matching A3S tool. a3s box ... proxies to a3s-box ... and bootstraps the Box runtime automatically if it is missing:

a3s code            # launch the A3S Code TUI
a3s code serve      # start the local A3S Code API + Shu Xiao'an web UI
a3s box ps          # → a3s-box ps (auto-installs a3s-box if needed)
a3s <tool> --help   # a tool's own help
a3s list            # list installed a3s-* tools
a3s --version

Install

# from crates.io
cargo install a3s

# or from source
cargo install --git https://github.com/A3S-Lab/Cli

# or Homebrew
brew install A3S-Lab/tap/a3s

Then run the tools you need. a3s box ... installs a3s-box on first use. The Homebrew a3s formula installs the native RemoteUI helper a3s-webview automatically on macOS; if a source/cargo install is missing it, a3s code falls back immediately to printing the browser URL.

A3S Code TUI

a3s code launches the interactive A3S Code terminal UI in the current workspace. On first launch it creates ~/.a3s/config.acl; use /config to edit models, provider credentials, and optional paths such as flow_dir, agent_dir, mcp_dir, skill_dir, and memory/session storage.

A3S Code is a complete agentic workspace. It combines a coding-agent chat loop, workspace editor, durable context, local asset development, OS asset publishing, Runtime fan-out, RemoteUI views, and engineered automation loops in one terminal surface.

Use this README as the TUI capability guide:

• A3S Code CLI Command Examples shows copyable non-interactive command forms and how they map to TUI workflows.
• Capability Overview maps the major product surfaces.
• Everyday Capability Paths explains how those surfaces fit together during real work.
• Inside The TUI explains the interactive transcript, input modes, panels, and keyboard model.
• Startup, Sessions, And Safety covers launch, resume, confirmation, and smoke validation.
• Effort Profiles explains how /effort changes reasoning, tool rounds, continuations, and ultracode.
• Dynamic Workflows separates DynamicWorkflowRuntime from /flow OS Workflow as a Service.
• OS, Runtime, and RemoteUI shows what /login unlocks, including the login-gated runtime tool.
• Core Command Reference lists the everyday TUI commands that are not tied to an asset family.
• Agents, Research, and Loops lists the detailed command forms for assets, DeepResearch, and engineered loops.

A3S Code CLI Command Examples

a3s code is both the interactive TUI entry point and a small non-interactive CLI for the same asset, model, knowledge, RemoteUI, and OS surfaces. The CLI forms are useful in scripts, release checks, terminals without a full-screen UI, and docs that need reproducible examples. Commands that read or mutate OS resources require a3s code login; local discovery, config, memory, KB, review prompts, and view URL opening keep working without an OS session.

Start, resume, and update the TUI:

a3s code                         # launch the TUI in the current workspace
a3s code serve                   # start local API and Shu Xiao'an web UI
a3s code resume                  # resume the newest saved TUI session here
a3s code resume 018f-session-id  # resume a specific saved session
a3s code update                  # upgrade the CLI and restart into this session

Start the local Web API and bundled 书小安 frontend:

a3s code serve
a3s code serve --workspace /path/to/project
a3s code serve --host 127.0.0.1 --port 29653
a3s code serve --api-only

The API is built with a3s-boot and reuses the same config.acl discovery as the TUI. By default it serves the Rsbuild output from apps/web/dist/workspace; pass --web-dir to serve a different frontend build.

Inspect and create config.acl:

a3s code config path                 # print the discovered config path
a3s code config init                 # create the preferred default config
a3s code config init .a3s/config.acl # create a project-local config
a3s code config cat                  # print the active config
a3s code config check                # summarize providers, models, and OS config
a3s code config edit                 # open VISUAL/EDITOR, or print the path
a3s code config dirs                 # print config, asset, memory, KB, and OKF dirs
a3s code dirs                        # shorthand for the same directory summary

Sign in to A3S OS and check account state:

a3s code login                 # open the configured OS OAuth login flow
a3s code login "$A3S_OS_TOKEN" # store an existing OS bearer token
a3s code auth status           # show OS endpoint, account, and expiry
a3s code auth login            # alias for interactive login
a3s code auth logout           # alias for logout
a3s code logout                # remove the stored OS session

List runtime-callable models:

a3s code models
a3s code model
a3s code model list

The model commands list config.acl models, local Claude/Codex account models, and signed-in OS gateway models from the unified gateway. They are not the same thing as digital asset repository entries whose category happens to be model.

Find local asset sources, clone repositories, and inspect OS assets:

a3s code agent local
a3s code agent local reviewer
a3s code agent clone https://github.com/acme/reviewer-agent.git
a3s code agent list reviewer
a3s code agent activity failed

a3s code mcp local weather
a3s code mcp clone https://github.com/acme/weather-mcp.git
a3s code mcp list weather
a3s code mcp activity running

a3s code skill local summarize
a3s code flow local release
a3s code okf local security

local, clone, and review are local developer conveniences. list, activity, and every publish/deploy/open/log/status operation call OS APIs and therefore need a configured os = "https://..." plus a valid login.

Run agent lifecycle commands:

a3s code agent review agents/reviewer
a3s code agent publish agentic agents/reviewer
a3s code agent publish application agents/portal
a3s code agent publish tool agents/sql-checker
a3s code agent run agents/reviewer
a3s code agent deploy agents/portal
a3s code agent open agentic agents/reviewer
a3s code agent logs tool agents/sql-checker
a3s code agent status application agents/portal

An Agent asset is a package directory. agent.md, agent.yaml, or agent.yml is only the package entrypoint; passing the entry file still works for compatibility, but publish/deploy uploads the whole package.

Run MCP lifecycle commands:

a3s code mcp review mcps/weather
a3s code mcp publish mcps/weather
a3s code mcp debug mcps/weather
a3s code mcp test mcps/weather
a3s code mcp deploy mcps/weather
a3s code mcp open mcps/weather
a3s code mcp logs mcps/weather
a3s code mcp status mcps/weather

Run skill, workflow, and OKF lifecycle commands:

a3s code skill review skills/summarize/SKILL.md
a3s code skill publish skills/summarize/SKILL.md
a3s code skill deploy skills/summarize/SKILL.md
a3s code skill open skills/summarize/SKILL.md
a3s code skill status skills/summarize/SKILL.md

a3s code flow review flows/release-gate.json
a3s code flow publish flows/release-gate.json
a3s code flow run flows/release-gate.json
a3s code flow deploy flows/release-gate.json
a3s code flow open flows/release-gate.json
a3s code flow logs flows/release-gate.json
a3s code flow status flows/release-gate.json

a3s code okf review .a3s/okf/security-playbook
a3s code okf publish .a3s/okf/security-playbook
a3s code okf deploy .a3s/okf/security-playbook
a3s code okf status .a3s/okf/security-playbook

Manage local knowledge, context history, and memory:

a3s code kb stats
a3s code kb add "Release notes should mention the gateway model split."
a3s code kb import docs/
a3s code kb search "gateway model split"
a3s code kb vault

a3s code ctx search "RemoteUI view link"
a3s code ctx show 01HVEXAMPLEEVENT --window 8
a3s code ctx session 018f-session-id

a3s code memory list
a3s code memory list "database migration"
a3s code memory stats
a3s code memory dir
a3s code mem list "preference" # alias for memory

/ctx <n> attachment and /ctx save <n> memory promotion are interactive TUI state, so the CLI exposes the durable search, show, and session forms instead of pretending to attach context to a running transcript.

Inspect local process activity and open explicit RemoteUI URLs:

a3s code top
a3s code top --json
a3s code view "https://os.example.com/admin/assets/abc"
a3s code view "https://os.example.com/admin/assets/abc" --width 1280 --height 820
a3s code view "https://os.example.com/admin/assets/abc" --size 1280x820

Inside the TUI, the same surfaces are available through slash commands and input prefixes:

/help
/model
/effort
/config
/ide
/output
/login
/view
/agent
/mcp
/skill
/flow
/okf
/loop init release-gate ci-sweeper
/loop run release-gate
? research how the OS gateway discovers runtime models
! cargo test --all-targets
@src/main.rs

Capability Overview

Area	What A3S Code TUI provides
Coding loop	Chat with the coding agent, stream tool calls, approve or deny tools, switch /auto, run direct shell turns with !, set a persistent /goal, ask background side-questions with /btw, and fork or clear sessions when needed.
Workspace UI	/ide opens a superfile-style file tree and editor, /config edits the config file in the same editor, /output shows every tool call with arguments/results, and file edits render bounded diffs through the shared DiffView component.
Models and effort	/model switches configured providers, OS gateway models, and signed-in account tabs. /effort scales thinking budget, tool-round budget, auto-continuation, and model-agnostic rigor guidance from low through max and ultracode.
Dynamic workflows	ultracode and ? DeepResearch can use DynamicWorkflowRuntime, a local A3S Flow-backed workflow runner. It records workflow/step history while PTC scripts perform ordinary tool work. This is separate from /flow, which is OS Workflow as a Service for persisted workflow assets.
Local and remote parallelism	Local subagent fan-out uses the host-side parallel_task tool. QuickJS/PTC scripts do not call parallel_task directly; dynamic workflows schedule a Flow step named parallel_task, and the host executes it natively. After /login, the signed-in runtime tool is available to workflow steps and model turns for OS Runtime batch execution.
Deep research	Prefix a prompt with ? to start DeepResearch. The TUI first gathers evidence through DynamicWorkflowRuntime; when signed in it tries OS runtime, falls back to local host-side parallel_task when needed, then asks the model to synthesize a cited report and RemoteUI/local artifacts.
Context and memory	The status bar tracks context fill and auto-compaction. /ctx searches past sessions, /ctx <n> attaches a previous transcript window, /ctx save <n> promotes it to memory, /sleep consolidates the day, and /memory browses durable memories as an event/entity graph with aliases, tiers, relations, conflicts, and forget candidates.
Knowledge	/kb manages a local personal knowledge vault for notes, imports, search, browsing, and shared-confirm deletion. /okf manages shareable OKF knowledge-package assets under .a3s/okf and publishes them to the OS Knowledge service when signed in.
Asset development	/agent, /mcp, /skill, and /okf enter local development modes with an active asset, review commands, clone/draft flows, and publish/deploy/status surfaces. /flow works differently: it selects or drafts workflow DAG assets and sends them to OS Workflow as a Service, without entering a persistent local dev mode.
Runtime activity	/top focuses local coding-agent process activity, including CPU/MEM trend sparklines in the shared process table. Asset-specific activity commands (/agent activity, /mcp activity, /flow activity, /skill activity, /okf activity) inspect OS Runtime jobs/runs for the selected asset.
Engineered loops	/loop init, /loop run, /loop audit, and /loop logs manage durable loops under .a3s/loops. Loops use maker/checker separation, reports, budgets, state files, and OS Runtime/RemoteUI evidence when enabled; inside /agent mode they stay local and target the active agent package.
OS and RemoteUI	/login enables OS capabilities. /view reopens the latest RemoteUI ViewLink captured from shaped OS progressive responses (.view or viewUrl), using the native a3s-webview helper when available and browser fallback otherwise.
Operations	/help shows the full command guide, /theme cycles syntax themes, /plugin and /reload manage skills/plugins, /update upgrades and restarts, /compact summarizes context, and /fork branches a new session from the current transcript.

Everyday Capability Paths

A3S Code TUI is designed around work paths rather than isolated commands. Most turns start as a normal chat prompt, then the TUI decides which context, permissions, tools, panels, and follow-up evidence are needed.

Work path	Typical flow	Useful surfaces
Repository orientation	Start with /init, ask for a map of the codebase, attach files with @, and open /ide when you need to browse or edit directly.	/init, /ide, @<path>, /ctx, /help
Focused coding	Ask for a change, review streamed reads/searches/diffs, approve gated writes, and let the agent run focused checks before summarizing what changed.	Tool cards, approval overlay, DiffView, /output, ! <command>
Debugging and verification	Let the model inspect logs, grep call sites, run shell or test commands, and keep the exact tool evidence visible in the transcript and output log.	grep, read, bash, git, /output, /top
Context carry-over	Search previous sessions, attach relevant transcript windows, save durable facts, and compact when the context meter gets high.	/ctx <query>, /ctx <n>, /ctx save <n>, /memory, /sleep, /compact
Deep work	Raise /effort, use ultracode for complex turns, and let the host decide whether planning, goal tracking, dynamic workflow execution, or parallel fan-out is justified.	/effort, /goal, dynamic_workflow, task, parallel_task
Research	Prefix with ? so the host gathers evidence first, then asks the model to synthesize a cited answer and report artifact.	? <question>, DynamicWorkflowRuntime, signed-in runtime, local parallel_task fallback
Local asset development	Enter an asset mode, iterate on the selected local definition, review it, then publish or deploy only when the OS side is available and appropriate.	/agent, /mcp, /skill, /okf, /flow, /loop
Operations and recovery	Resume saved sessions, reopen RemoteUI, inspect local or OS activity, hot-reload plugins, and update the CLI without losing the session.	a3s code resume, /view, /top, asset activity, /plugin, /reload, /update

The key boundary is that local automation stays useful without an OS account, while OS-backed actions become available only after /login. Local commands can draft assets, run tools, build memory, use MCP, delegate to child agents, and execute dynamic workflows. Signed-in commands add OS assets, Runtime batches, RemoteUI ViewLinks, service activity, and publishing or deployment.

The TUI keeps these paths observable. A long turn can show a plan row, reasoning deltas, live tool status, approval prompts, subagent progress, dynamic-workflow artifacts, memory events, RemoteUI actions, and final verification evidence in the same transcript instead of scattering state across separate logs.

Inside The TUI

The main screen is an event-driven transcript. User messages, model text, reasoning deltas, tool starts, streamed tool output, approvals, subagent progress, plans, memory events, and final summaries arrive as structured AgentEvent values from a3s-code-core and are rendered incrementally through a3s-tui.

Surface	What you see and control
Transcript	Assistant text, reasoning, tool cards, diff summaries, task updates, memory recall/store notices, compaction notices, and RemoteUI action links stay in one scrollable history. Drag-select copies transcript text on release.
Input line	Type a normal prompt, use Shift+Enter for multiline input, prefix ! for a direct shell turn, prefix ? for DeepResearch, use @<path> to attach a workspace file through the clickable picker, or paste an image with Ctrl+V.
Slash menu	Press / or type a slash command to open a wheel-browsable, clickable command palette backed by the same command registry used by /help. Commands are grouped into model/config, workspace, context, OS, asset, and operations surfaces.
Approvals	Mutating tools pause in a confirmation overlay with arguments and result context. Default mode prompts, plan mode auto-approves read-only discovery, and auto mode approves later tool calls in the session.
Footer	The footer shows model/provider, effort, mode, context fill, active asset, login/runtime state, and session hints. Context warnings re-arm after compaction, clear, or model switch.
Tool output	Live tool status appears inline while running; /output opens a retained tool-log panel with every tool name, argument summary, output tail, status, and captured workflow or task document where available.
Workspace editor	/ide opens a full-screen file browser/editor. /config reuses the editor for the active ACL config. Both surfaces keep edits inside the workspace backend and normal permission path.
Memory and knowledge	/memory opens the durable memory graph. /ctx searches past sessions and can attach or save hits. /kb opens the local personal knowledge vault. /okf manages shareable knowledge packages.
Asset panels	/agent, /mcp, /skill, and /okf keep an active local asset visible while you iterate. /flow selects or drafts workflow DAG assets for OS Workflow as a Service rather than entering a persistent local dev mode.
Operations panels	/model, /effort, /top, /loop, /plugin, /theme, /help, and asset activity commands open focused panels without losing the current conversation.

Key interactions:

Key or input	Behavior
Enter	Send the prompt; when a turn is busy, queue the next message.
Shift+Enter	Insert a newline in the input.
Shift+Tab	Cycle run mode: default, plan, auto.
Up / Down	Recall input history or move through menus/panels.
PgUp / PgDn	Scroll the transcript or the active full-screen panel.
Shift+End	Jump to the latest transcript output.
Esc	Interrupt the running turn or close the active panel.
Ctrl+C twice	Quit the TUI after session persistence runs.

Startup, Sessions, And Safety

Launch the TUI from the repository or workspace the agent should inspect:

a3s code
a3s code resume <session-id>
a3s code resume

Config discovery checks A3S_CONFIG_FILE, then .a3s/config.acl while walking upward from the current directory, then ~/.a3s/config.acl. If none exists, the first launch writes a starter ~/.a3s/config.acl and opens it in the built-in editor. Project-local config can set model/provider choices, OS endpoint, flow_dir, agent_dir, mcp_dir, skill_dir, storage, memory, delegation, and asset paths.

Sessions auto-save under <workspace>/.a3s/tui-sessions. Exiting prints the exact resume command; a3s code resume without an id resumes the newest saved session in that workspace. /fork copies the current transcript into a new session id while keeping the original, and /clear starts a fresh conversation.

The TUI owns HITL confirmation for gated tools. In default mode, mutating tools prompt through a wheel-browsable, clickable approval overlay; a or /auto approves later tool calls for the session, while Shift+Tab cycles default, plan, and auto modes. Plan mode auto-approves read-only discovery tools but still asks before writes. Tool timeouts and confirmation timeouts are tracked separately so a human approval pause does not consume the command runtime budget.

All local filesystem work stays under the active workspace services and A3S Code permission policy. OS operations require /login; before login the TUI can still author local assets, run local subagents, use local memory, and execute DynamicWorkflowRuntime, but the OS runtime tool, RemoteUI ViewLinks, asset publishing, and OS service activity panels are unavailable.

For CI or release probes, set A3S_CODE_TUI_SMOKE=1 to exercise the same AgentSession::stream() integration without taking over the terminal.

Tool Runtime And Safety

A3S Code TUI exposes tools through the session registry, not by letting the model run arbitrary host APIs. Each tool call carries a name, JSON arguments, streamed output, timeout policy, permission decision, and traceable event id. The TUI then turns those events into live status lines, retained output logs, approval prompts, and RemoteUI action links.

Tool family	TUI behavior
Workspace tools	read, write, edit, patch, ls, glob, grep, bash, git, web_fetch, and web_search run through workspace services, path boundaries, timeout handling, and confirmation policy.
Structured output	generate_object lets the model request schema-shaped JSON while keeping the result in the same tool event stream as normal tools.
MCP tools	Configured MCP servers are registered as mcp__<server>__<tool> names, appear in tool visibility, and use the same approval and output rendering path.
PTC scripts	The program tool runs sandboxed JavaScript-compatible scripts with a host-provided ctx object. It is useful for deterministic local glue, but recursive program, dynamic_workflow, and parallel_task calls are kept out of the default PTC allow-list.
Delegation	task launches one child agent. parallel_task launches multiple child agents on the native host runtime, preserves input order, emits subagent progress events, and respects max_parallel_tasks.
Dynamic workflow	dynamic_workflow is always registered in the TUI because ultracode and ? DeepResearch use it. It records A3S Flow history and can schedule host steps such as parallel_task.
OS runtime	The runtime tool is registered only after /login. Once present, normal model turns and dynamic workflow PTC steps can call it for OS Function as a Service batch execution.

Effort Profiles

/effort is not just a UI label. It rebuilds the active session with a larger reasoning budget, larger tool-round budget, longer auto-continuation allowance, and stronger model-agnostic rigor guidance. Anthropic models receive the thinking budget directly; GPT, GLM, OS Gateway, and account-backed models use the same profile through prompt guidance, tool-round limits, and continuation limits.

Level	Thinking budget	Tool rounds	Continuations	Intended behavior
low	1,024	120	2	Fast, minimal changes with narrow verification.
medium	4,096	200	3	Balanced default behavior without extra depth steering.
high	8,192	300	4	More deliberate planning, relevant tests, and self-review.
xhigh	16,384	400	6	Compare alternatives, probe edge cases, and verify thoroughly.
max	32,768	500	8	Maximum rigor for correctness, adversarial checks, and completeness.
ultracode	32,768	600	8	Message-gated dynamic workflow mode: trivial turns stay direct; complex turns may use dynamic_workflow, A3S Flow replay, host-side parallel_task, and signed-in runtime.

All effort levels keep local task and parallel_task available, with max_parallel_tasks set to 8 for the TUI session. ultracode adds PlanningMode::Auto, goal tracking, and dynamic-workflow guidance, but it still lets the pre-analysis gate decide whether a turn actually needs planning or fan-out.

Dynamic Workflows

There are two workflow concepts, intentionally kept separate:

Concept	Surface	Purpose
DynamicWorkflowRuntime	Model-visible dynamic_workflow tool, used by ultracode and ? DeepResearch	Per-turn dynamic orchestration. A sandboxed JavaScript PTC function returns A3S Flow commands such as complete, fail, schedule_step, or schedule_steps; A3S Flow records replayable workflow and step history.
OS Workflow as a Service	/flow, /flow publish, /flow run, /flow deploy, /flow open, /flow logs, /flow status	Durable workflow asset lifecycle. Local DAG JSON files are published as OS workflow assets with runtime-binding metadata and opened in the OS workflow designer/run surfaces.

Dynamic workflow PTC steps can call ordinary tools such as ctx.read, ctx.grep, or ctx.tool("runtime", ...) when runtime is registered after OS login. They cannot call parallel_task directly. To fan out local subagents, the workflow schedules a Flow step with step_name: "parallel_task"; the TUI host then runs the native parallel_task implementation outside QuickJS.

Minimal dynamic workflow scripts return Flow commands from a default exported function. If you author the script in TypeScript locally, transpile it first: the source passed to the TUI runtime must be JavaScript-compatible for the QuickJS PTC sandbox.

export default async function run(ctx, inputs) {
  if (inputs.kind === "workflow") {
    return {
      type: "schedule_steps",
      steps: [
        {
          step_id: "inspect",
          step_name: "inspect_workspace",
          input: { query: inputs.input.query }
        },
        {
          step_id: "fanout",
          step_name: "parallel_task",
          input: {
            tasks: [
              {
                task_id: "tests",
                agent: "explore",
                description: "Find test coverage",
                prompt: "Inspect relevant tests and coverage gaps."
              },
              {
                task_id: "risk",
                agent: "review",
                description: "Review risk",
                prompt: "Review the approach for regressions."
              }
            ]
          }
        }
      ]
    };
  }

  if (inputs.step_name === "inspect_workspace") {
    const hits = await ctx.grep(inputs.input.query, { glob: "*.rs" });
    return { hits };
  }

  return { ok: true };
}

Architecture

A3S Code is a TEA-style terminal application: terminal events and agent stream events become Msg values, Model.update mutates one session model, and view functions render the current state through a3s-tui. Runtime-heavy state is kept as a small ECS-style projection: tool runs, subagent runs, Runtime activity records, RemoteUI links, and retained tool logs are updated by stable event ids and queried by panels instead of coupling every panel to the streaming protocol.

The command palette, asset selectors, approval overlay, /model account picker, /plugin skill toggles, detail panels, tool status lines, transcript gutters and user bubbles, input prompt chrome, live reasoning, live and completed tool output, pinned plan rows, task summaries, file-edit diffs, SPF/IDE file metadata, /loop details, compaction progress, the live activity shimmer, effort overlay, /top header and process table, and footer status rows use shared a3s-tui components such as MenuPanel, ChoicePrompt, TabbedMenuPanel, DetailPanel, Timeline, ActivityBlock, SectionHeader, ToolStatusLine, GutterBlock, InlineAction, Alert, TextOverlay, Toast, InputBorder, PromptLine, OutputBlock, Badge, Checklist, CursorLine, DiffView, Divider, PanelFrame, Breadcrumb, Progress, Confirm, Paragraph, PreviewPanel, TreePicker, ShimmerText, LevelSlider, Scrollbar, Sparkline, KeyValue, DataTable, WrappedPrefixBlock, SessionStatus, ModeLine, and the Meter context fill rendered inside the footer status row. Reusable menu scrolling, selection, slash command wheel browsing and click-to-run, approval overlay wheel browsing and click-to-approve or deny, /model account tab mouse switching, /effort wheel/click adjustment, /theme wheel preview and click-to-apply, @ file picker wheel browsing and click-to-insert, /agent picker wheel browsing and click-to-develop, /mcp picker wheel browsing and click-to-develop, /skill picker wheel browsing and click-to-develop, /okf picker wheel browsing and click-to-develop, /flow picker wheel browsing and click-to-open, /plugin wheel browsing and click-to-toggle, /top process table wheel browsing and click row selection, approval choices, RemoteUI and jump-to-latest action links, tool status truncation, shared alert rows for OS login/configuration warnings, overlay composition for menus and prompts, IDE flash footer notifications, live tool activity/output tails, /top status header actions and CPU/MEM trend sparklines, /loop key-value summaries, /kb delete confirmations, transcript gutters and input bubbles, prompt continuation alignment, input border labels, shared display-width wrapping for live reasoning and detail text, completed output tail previews, pinned plan checklists, task status summaries, compaction progress bars, pinned memory importance bars, transcript scrollbars, IDE cursor rows, panel dividers, activity output tails, diff wrapping, framed panels, breadcrumbs, detail-row layout, activity shimmer, /model tab hit-testing, /effort slider hit-testing, slash command palette hit-testing, approval overlay hit-testing, /theme preview hit-testing, @ file picker hit-testing, /agent picker hit-testing, /mcp picker hit-testing, /skill picker hit-testing, /flow picker hit-testing, /plugin overlay hit-testing, /top process table hit-testing, and width-bounding fixes are exercised directly by a3s code.

flowchart TD
    user["Terminal user"] --> cli["a3s CLI<br/>a3s code"]
    cli --> app["TEA TUI App<br/>App state + Msg"]

    app --> core["a3s-code-core<br/>AgentSession"]
    core --> events["AgentEvent stream<br/>text, tools, planning, subagents"]
    events --> pump["event pump<br/>AgentEvent -> Msg::Agent"]
    pump --> app

    app --> update["Model.update<br/>commands, approvals, panels"]
    update --> render["view + layout<br/>a3s-tui"]
    render --> frame["terminal frame"]
    frame --> user

    events --> projection["RuntimeProjection<br/>local ECS-style projection"]
    projection --> toolrun["ToolRun entities<br/>live input/output/status"]
    projection --> subrun["SubagentRun entities<br/>tokens, timing, result"]
    projection --> toollog["ToolCallRecord log<br/>/output history"]

    app --> dynamic["DynamicWorkflowRuntime<br/>A3S Flow + PTC"]
    dynamic --> program["program tool<br/>QuickJS sandbox"]
    dynamic --> hostparallel["host parallel_task<br/>native local fan-out"]

    projection --> panels["TUI panels<br/>chat, plan, top, output"]
    app --> assets["Asset panels<br/>agent, MCP, flow, skill, OKF, KB"]
    panels --> render
    assets --> render

    core --> workspace["workspace services<br/>shell, files, MCP tools, permissions"]
    workspace --> project["current workspace<br/>source, config, .a3s assets"]
    assets --> project

    app --> os["A3S OS progressive APIs<br/>assets, runtime, functions, workflows, knowledge"]
    dynamic --> osruntime["login-gated runtime tool<br/>OS batch execution"]
    assets --> os
    core --> os
    os --> remote["RemoteUI ViewLink<br/>.view / viewUrl"]
    remote --> webview["a3s-webview<br/>browser fallback"]
    webview --> user

OS, Runtime, and RemoteUI

Add an OS endpoint to config.acl, then sign in:

os = "https://os.example.com"

a3s code
# then inside the TUI:
/login

After login, A3S Code can use OS capabilities directly from the TUI:

Command	What it does
/view	Reopen the latest OS RemoteUI view captured from a tool response.
/flow	Select a local workflow DAG JSON, publish it as an OS workflow asset, and open the OS workflow designer; /flow <description> drafts a new DAG first. /flow is OS Workflow as a Service, not the per-turn dynamic workflow runtime.
Asset activity subcommands	Browse asset-related Runtime activity through /agent activity, /mcp activity, /flow activity, /skill activity, or /okf activity; when a local asset is not active, A3S Code opens the matching selection panel first.
/mcp publish/debug/test	Publish the active local MCP asset as an OS mcp asset, then debug or batch-test it through OS Function as a Service.
runtime tool	Registered only after /login. It resolves a tool-kind worker asset by UUID or name, submits independent inputs to OS Function as a Service batch execution, streams progress, and returns aggregated results.

Signed-out behavior is intentionally useful but local: chat, file editing, tools, MCP, local asset drafting, memory, /ctx, /kb, task, parallel_task, dynamic_workflow, DeepResearch fallback, and local loops keep working. Signed-in behavior adds OS assets, Function as a Service, Workflow as a Service, Knowledge service deployment, RemoteUI ViewLinks, asset activity panels, and the runtime tool.

Capability	Signed out	Signed in after /login
Coding chat and workspace tools	Available with local permission checks and HITL approval.	Available with the same local safety path.
Context, memory, and local knowledge	/ctx, /memory, /sleep, and /kb use local stores.	Local stores remain available; OS-backed reports can also return RemoteUI views.
Dynamic workflows	DynamicWorkflowRuntime can run local Flow-backed orchestration and host-side parallel_task fallback.	Workflow PTC steps may also call the registered runtime tool for OS batch work.
Asset authoring	/agent, /mcp, /skill, /flow <description>, and /okf can draft and review local assets.	Publish, deploy, run, open, logs, status, list, and activity commands can use OS services.
RemoteUI	Unavailable except for existing browser URLs printed by local tools.	.view and viewUrl responses become Open view actions and /view history.
Runtime activity	/top observes local processes.	Asset activity commands inspect OS Runtime jobs, runs, invocations, indexing, and workflow activity.
Updates and recovery	/update, /fork, /clear, and a3s code resume remain local.	Same behavior; saved sessions keep OS login-derived capability state separate from secrets.

OS Service Mapping

OS mechanism	A3S Code TUI path
Agent as a Service	/agent publish agentic, /agent publish application, /agent run, and /agent deploy use OS agent assets with agentKind=agentic or agentKind=application. Publish commits the local package source, entrypoint, .a3s/agent.asset.json, .a3s/agent.config.json, and .a3s/agent.runtime-binding.json, then syncs OS agent-config and runtime-binding endpoints when available. Run/deploy first discover the current OS operation through progressive capabilities with shaped=true, then fall back to REST probes and the OS asset view. /agent open and /agent logs inspect existing assets and prefer progressive ViewLinks before static OS views.
Function as a Service	Tool-kind agents and MCP tool calls stay Runtime workers. /agent publish tool uses OS agent assets with agentKind=tool and a Function as a Service runtime binding; /mcp publish, /mcp deploy, /mcp debug, and /mcp test use OS mcp assets with runtimeBinding.kind=mcp, isolation=serving, and agentKind=tool; /skill publish and /skill deploy use OS skill assets with serving Function as a Service binding intent. MCP debug/test and skill deploy paths first try OS progressive capabilities with shaped=true so .view/viewUrl survives as a ViewLink, then fall back to Function invoke, batch, or asset views. The runtime tool sends parallel batches to /api/v1/functions/<worker>/batch with agentKind=tool.
Workflow as a Service	/flow, /flow publish, /flow run, and /flow deploy create or update OS workflow assets, commit .a3s/workflows/main.design.json, .a3s/workflow.asset.json, and .a3s/workflow.runtime-binding.json, then sync the runtime-binding endpoint when available. Run/deploy first try OS progressive capabilities with shaped=true for a workflow designer ViewLink and fall back to the standalone workflow designer for edit and run. /flow open, /flow logs, and /flow status inspect the asset, logs, and runtime binding without mutating it.
Knowledge service	/okf selects local OKF packages. /okf publish creates or updates an OS knowledge asset, uploads package sources plus .a3s/knowledge.asset.json and .a3s/knowledge.runtime-binding.json, and syncs the runtime-binding endpoint when available. /okf deploy publishes the package first, then tries OS progressive knowledge-service deployment with shaped=true; if no matching operation exists, the Knowledge service view opens. /okf status checks the OS asset and runtime binding without mutating it. /kb vault remains the local personal knowledge-base browser. Without OS, deploy stays local and reports the blocked knowledge-service inputs.

AI-Native Asset Lifecycle

A3S Code treats agents, MCP servers, skills, OKF knowledge packages, and workflow flows as team digital assets and shared context. Each asset family uses the same lifecycle vocabulary in the TUI and OS, while exposing only the commands backed by real local or OS surfaces:

Stage	TUI responsibility	OS responsibility
Create	Draft a local asset package or definition from natural language.	Create a private/team asset workspace with typed metadata.
Develop	Agents, MCP servers, skills, and OKF packages enter local multi-turn asset-development mode with a visible active asset and an exit path. Workflow flows use local DAG editing plus the OS workflow designer instead of a persistent local mode.	Keep asset source, metadata, secrets, and collaboration history as shared context.
Debug/test	Run local smoke checks first; expose direct debug/test commands only when the asset family has a real service surface.	MCP servers use Function as a Service debug/test calls. Agentic agents are exercised through /agent run, workflow flows through /flow run, application agents through /agent deploy, and tool agents, skills, and OKF packages do not expose direct TUI run/debug commands.
Publish	Commit source, manifest, config, runtime binding, examples, and tests.	Validate config/runtime binding, package the asset, record release gates, and expose team discovery.
Deploy	Trigger only the deployment shape that matches the asset type.	Launch long-running applications only when needed; prefer serving Function as a Service for stateless tools and MCP calls.
Inspect	Open read-only asset views, status, logs, or runtime-binding checks only when that asset family exposes the surface.	Provide asset metadata, binding validation, service views, package state, and RemoteUI evidence without mutating assets.
Activity	Browse asset-scoped Runtime activity instead of using a top-level process or run manager.	Provide function invocations, batches, workflow runs, indexing/evaluation jobs, and agent runs filtered to the selected asset.

RemoteUI views are captured from OS progressive responses (.view/viewUrl). The TUI remembers the latest view and surfaces ViewLinks returned by asset-scoped actions that return OS views. Report-oriented autonomous work such as DeepResearch and OS-enabled loops expects fan-out evidence (dynamic_workflow, runtime, or host-side parallel_task) plus a shaped .view/viewUrl report response; when either part is missing, autonomous runs spend the next loop turn on a targeted Runtime-evidence retry before accepting a final answer.

Core Command Reference

These commands are available outside the asset-specific flows:

Command	Capability
/help	Open the full command guide with slash commands, command forms, input modes, keys, panels, and resume help.
/model	Switch among configured ACL models, OS gateway models, and signed-in account-backed model tabs when available.
/effort	Change the active effort profile from low to ultracode, with keyboard, wheel, and click adjustment before confirmation rebuilds the session with matching budgets and prompt guidance.
/init	Analyze the workspace and generate an AGENTS.md instruction file.
/config	Edit the active ACL config in the built-in editor.
/theme	Cycle syntax highlighting themes.
/login / /logout	Sign in or out of the configured OS account; login registers OS capabilities and the runtime tool.
/view	Reopen the latest captured OS RemoteUI ViewLink.
/output	Inspect retained tool calls for the current session.
/top	Inspect local agent process activity with keyboard, wheel, or click row selection.
/ide	Open the workspace file browser and editor.
/memory	Browse durable memory as an event/entity graph with tiers, aliases, relations, conflicts, and forget candidates.
/ctx <query>	Search past ctx-indexed sessions.
/ctx <n>	Attach a previous search result to the next message.
/ctx save <n>	Promote a previous session hit into durable memory.
/sleep	Consolidate the day's work into memory, including experience, preferences, and knowledge.
/kb / /kb add / /kb import / /kb search / /kb vault	Manage the local personal knowledge base.
/btw <question>	Ask a background side-question outside the main chat path.
/goal <text>	Set a persistent goal for the current session or active asset mode.
/compact	Summarize and shrink the active conversation context.
/clear	Start a fresh conversation in the current session surface.
/fork	Branch the current transcript into a new session id.
/auto	Switch the session into auto-approve mode.
/plugin / /reload	Manage and hot-reload skills/plugins, including wheel browsing and click-to-toggle skill state in the TUI.
/update	Upgrade the CLI and restart back into the saved session.
/exit	Quit a3s code after session persistence runs.

Agents, Research, and Loops

Command	What it does
/agent	Select a local agent package from agent_dir with keyboard, wheel, or click, then enter local multi-turn agent-development mode. The TUI shows the active agent; press Esc or run /agent off to return to normal mode. While active, /goal becomes an agent-scoped development goal and /loop runs local agent-scoped loop engineering. No OS WebIDE or RemoteUI is opened for this local VibeCoding flow.
/agent <description>	Draft a package directory with a Markdown/YAML agent entrypoint under agent_dir, then use /agent to iterate on it.
/agent clone <git-url>	Clone an existing agent asset source into agent_dir, then use /agent to select it.
/agent list [query]	Browse OS agent assets through the asset-scoped list panel.
/agent activity [query]	Inspect Runtime activity, jobs, and runs for the selected local agent; when no agent is active, A3S Code opens the agent selection panel first.
/agent review	Review the active local agent. If no agent is active, A3S Code opens the agent selection panel first, enters agent-development mode, then reviews the selected agent.
/agent publish agentic	Publish the active local agent package as an OS agent asset with agentKind=agentic. The package source, entrypoint, manifest, runtime binding intent, and machine-readable agent config are saved with the asset source, then synced to OS agent-config and runtime-binding endpoints when available.
/agent publish application	Publish the active local agent package as an OS agent asset with agentKind=application, ready for OS-side application-agent deployment. The same manifest, runtime binding intent, agent-config sync, and runtime-binding sync are applied.
/agent publish tool	Publish the active local agent package as an OS agent asset with agentKind=tool and a Function as a Service runtime binding. The package source, entrypoint, config metadata, and runtime binding intent are committed; runtime-binding sync is attempted when available.
/agent run	Publish or update the active local agent as an agentic asset, then ask OS Agent as a Service to start a run through progressive capabilities. If the deployed OS does not expose a compatible operation yet, the TUI opens the OS asset view instead.
/agent deploy	Publish or update the active local agent as an application asset, sync agent config, read the latest asset source revision, trigger the OS application-agent build, and launch it into the selected/default Runtime namespace when package and namespace metadata are available. Otherwise the OS asset view opens for the missing input.
/agent open [agentic|application|tool] / /agent logs [agentic|application|tool]	Observe the existing OS asset or Runtime log view for the active local agent without creating or uploading it; progressive ViewLinks are preferred when available.
/agent status [agentic|application|tool]	Check whether the active local agent has a matching OS asset, valid config/runtime binding, and service-specific binding without creating, uploading, running, or deploying anything.
/mcp	Select a local MCP server asset from mcp_dir with keyboard, wheel, or click, then enter local MCP-development mode. The TUI shows the active MCP asset; press Esc or run /mcp off to return to normal mode.
/mcp <description>	Draft a local MCP server asset with metadata prepared for OS Function as a Service.
/mcp clone <git-url>	Clone an existing MCP asset source into mcp_dir, then use /mcp to select it.
/mcp list [query]	Browse OS MCP assets through the asset-scoped list panel.
/mcp activity [query]	Inspect Runtime activity, jobs, and tool invocations for the selected MCP asset; when no MCP is active, A3S Code opens the MCP selection panel first.
/mcp review	Review the active local MCP asset. If no MCP is active, A3S Code opens the MCP selector first, enters MCP-development mode, then reviews the selected MCP asset.
/mcp publish	Publish the active local MCP asset as an OS mcp asset, commit source plus .a3s/mcp.asset.json, .a3s/mcp.server.json, and .a3s/mcp.runtime-binding.json, then sync the OS runtime-binding endpoint when available.
/mcp deploy	Publish the active MCP asset and sync its serving Function as a Service runtime binding.
/mcp debug	Publish the active MCP asset, then invoke OS Function as a Service through progressive capabilities with shaped=true, falling back to /api/v1/functions/<mcp-asset>/invoke with agentKind=tool.
/mcp test	Publish the active MCP asset, then batch-test MCP tools through progressive capabilities with shaped=true, falling back to /api/v1/functions/<mcp-asset>/batch when needed.
/mcp open / /mcp logs / /mcp status	Inspect the OS MCP asset, logs, or runtime-binding status without mutating the asset; open/logs prefer progressive Function as a Service ViewLinks when available.
/flow	Select a local workflow DAG JSON from flow_dir with keyboard, wheel, or click, publish it as an OS workflow asset with a manifest and Workflow as a Service runtime binding, sync the runtime-binding endpoint when available, and open the workflow designer through a progressive ViewLink or standalone designer fallback.
/flow <description>	Draft a local workflow DAG JSON, then use /flow to publish and iterate through OS Workflow as a Service. This is an OS asset workflow, not DynamicWorkflowRuntime.
/flow clone <git-url>	Clone an existing workflow asset source into flow_dir; cloned OS designer documents under .a3s/workflows/main.design.json are discoverable by /flow.
/flow list [query]	Browse OS workflow assets through the asset-scoped list panel.
/flow activity [query]	Inspect Runtime activity and workflow runs for a selected workflow asset.
/flow review [file]	Review a local workflow DAG without publishing it.
/flow publish / /flow run / /flow deploy	Open the workflow selection panel, publish the selected DAG as an OS workflow asset, sync Workflow as a Service runtime-binding intent, then open the asset view or Workflow as a Service designer/run surface.
/flow open / /flow logs / /flow status	Open the existing OS workflow designer, Workflow as a Service logs, or runtime-binding status without mutating the selected workflow asset.
/skill	Select a local skill asset from skill_dir with keyboard, wheel, or click, then enter local multi-turn skill-development mode. The TUI shows the active skill; press Esc or run /skill off to return to normal mode.
/skill <description>	Draft a local skill asset prototype with SKILL.md, examples, tests, and Function as a Service binding intent.
/skill clone <git-url>	Clone an existing skill asset source into skill_dir, then use /skill to select it.
/skill list [query]	Browse OS skill assets through the asset-scoped list panel.
/skill activity [query]	Inspect related Function as a Service activity for the selected skill asset.
/skill review	Review the selected local skill asset. If no skill is active, A3S Code opens the skill selection panel first and enters skill-development mode.
/skill publish	Publish the selected skill as an OS skill asset backed by Function as a Service, committing source, .a3s/skill.asset.json, and .a3s/skill.runtime-binding.json.
/skill deploy	Publish the selected skill, sync its serving Function as a Service runtime binding, then prefer an OS progressive shaped deployment ViewLink before falling back to the asset view.
/skill open / /skill status	Inspect the OS skill asset or runtime-binding status without mutating the asset; open prefers progressive Function as a Service ViewLinks when available.
/kb	Open the local personal knowledge base for notes, imports, search, and vault browsing.
/kb add/import/search/vault	Capture a note, preview/import files or folders, search local knowledge sources, or browse the local .a3s/kb vault.
/okf	Select a local OKF knowledge package from .a3s/okf with keyboard, wheel, or click, then enter local package-development mode. The TUI shows the active package; press Esc or run /okf off to return to normal mode.
/okf <description>	Draft a local OKF package prototype with sources, wiki concepts, eval notes, and OS knowledge asset metadata.
/okf clone <git-url>	Clone an existing OKF package source into .a3s/okf, then use /okf to select it.
/okf list [query]	Browse OS knowledge package assets through the asset-scoped list panel.
/okf activity [query]	Inspect related Runtime indexing/evaluation activity for the selected knowledge package; when no package is active, A3S Code opens the OKF selection panel first.
/okf review	Review the selected local OKF package. If no package is active, A3S Code opens the OKF selection panel first and enters OKF-development mode.
/okf publish / /okf deploy	Publish the selected OKF package as an OS knowledge asset, sync Knowledge service runtime-binding intent, then deploy through progressive knowledge-service capabilities or open the Knowledge service view. Without OS, A3S Code performs local validation and reports blocked deployment inputs.
/okf status	Check the existing OS knowledge asset and runtime-binding status without mutating the selected package.
? <question>	Starts DeepResearch. The host first runs DynamicWorkflowRuntime to gather evidence. When OS is signed in, the workflow step may call runtime; if OS Runtime fails, it falls back to local host-side parallel_task. The synthesis turn then produces a cited answer plus RemoteUI or local Markdown/HTML report artifacts.
/loop	Opens the engineered-loop dashboard for persisted loops under .a3s/loops/.
/loop init [name] [pattern]	Creates a durable loop spec, STATE.md, RUN_LOG.md, budget file, skills, and reports folder. Built-in patterns include daily-triage, ci-sweeper, pr-babysitter, dependency-sweeper, changelog-drafter, and agent-dev.
/loop run <name>	Runs a loop with maker/checker separation. With OS signed in and os_runtime = true, normal workspace loops require Runtime/parallel fan-out, Markdown/HTML reports, RemoteUI report view data, and asset-scoped Runtime activity visibility. Inside /agent mode, the same command stays local and targets the active agent package.
/loop audit <name> / /loop logs <name>	Check loop readiness or open the append-only run log.
/loop <task>	Runs an autonomous quick loop until the task reports completion or you stop it.

Account Models

In a3s code, /model lists configured config.acl models plus signed-in account tabs. When Claude Code is logged in (claude /login), the Claude Code tab can switch the current session to Claude models using the local Claude Code OAuth credentials, including Claude Code's macOS Keychain entry. CLAUDE_CODE_OAUTH_TOKEN or ANTHROPIC_AUTH_TOKEN can also provide the account token for non-standard environments. If Anthropic rejects the raw OAuth Messages API bridge with a rate-limit or authentication error, a3s falls back to the installed claude CLI in safe streaming mode; Claude Code's own tools stay disabled while a3s host tools are requested through an adapter protocol and still execute inside a3s-code. The adapter accepts Claude Code-style <function_calls> output and tool names such as Read or Bash, normalizes common argument aliases like path to a3s's file_path, and feeds tool results back into the next Claude turn as structured history.

Testing

cargo test --all-targets
cargo test --test box_command_soak -- --ignored
cargo test --test ctx_compact_real_llm -- --ignored   # hits the configured LLM

The ignored soak test repeats a3s box after a fake first-use install and verifies later runs reuse the installed a3s-box. The ignored ctx_compact_real_llm test drives the configured model (~/.a3s/config.acl) until the context crosses the auto-compact threshold and asserts streaming usage is reported, compaction shrinks the history, and the next prompt drops — the machinery behind the TUI's ctx%, fill warnings, and auto-compaction.

Updating

In the TUI, /update upgrades to the latest release and restarts into your session. Homebrew installs refresh the A3S tap, upgrade or reinstall a3s-lab/tap/a3s, and verify both PATH and the Homebrew prefix binary. Standalone installs download the matching GitHub release archive, find the a3s binary inside it, swap the current binary, and verify the target version before treating the update as successful. If restart fails after a successful upgrade, the TUI prints the exact a3s code resume <id> command for the saved session.

If you're on an older build (≤ 0.5.4) whose /update was broken, it can't upgrade itself, and brew upgrade a3s alone won't see the new version (Homebrew doesn't re-sync a tap on upgrade). Bootstrap onto a current build once with:

brew update && brew upgrade a3s     # or: brew untap a3s-lab/tap && brew tap a3s-lab/tap && brew upgrade a3s
a3s --version

From 0.5.5 onward, /update handles the tap refresh itself, so this manual step isn't needed again.

License

MIT