aegis-harness 0.5.1

A multi-agent meta-harness for coding agents — drives Claude Code, Gemini CLI, and OpenCode in one calm full-screen TUI.

Aegis

The meta-harness. Drive Claude Code, Gemini CLI, and OpenCode side by side from one calm terminal — and make them collaborate.

┌ aegis · 3 agents · ~/code/aegis ─────────────────────────────────────┐
│ ● 1 lucid-knuth ·opus·   ● 2 wry-hopper ·gemini·   ● 3 brisk-curie * │
│                                                                       │
│ › explain the retry path in worker.py                                 │
│                                                                       │
│ ⠹ Thinking… (3.2s)                                                    │
│ ⏺ Read(worker.py)                                                     │
│   └ ok                                                                 │
│ The retry path lives in _run_turn at line 142 …                       │
│                                                                       │
│ ⏺ aegis_handoff(target=wry-hopper)                                    │
│   └ delivered to wry-hopper                                           │
│                                                                       │
│ queues: tests ●1/2 ○0 ✓3 ✗0    last: brisk-curie                      │
│ lucid-knuth ·opus· opus·full   ↑128k (94% cached) ↓1k                 │
│ ───────────────────────────────────────────────────────────────────── │
│ › ask something…                                                      │
└───────────────────────────────────────────────────────────────────────┘

Above the harness, not beside it

Most agentic frameworks (CrewAI, LangGraph, AutoGen, the whole long list) talk directly to LLM providers — they replace your coding agent and reimplement tool use, permissions, sandboxing, terminal integration. Aegis takes the opposite path:

• It sits above your existing coding agents and drives them over their structured protocols — stream-json for Claude Code, the Agent Client Protocol (ACP) for Gemini CLI and OpenCode, and a clean driver seam for whatever lands next.
• It doesn't reimplement the agent. Tool use, sandboxing, MCP hosting, model selection — that's the harness's job. Aegis's job is the layer above: tabs, routing, delegation, persistence, the things a single-conversation CLI was never built to do.
• It makes them collaborate. Five composable coordination primitives mean a Claude tab can hand off to a Gemini tab, dispatch an OpenCode worker, subscribe to a shared canvas, share a live terminal, or kick off a deterministic Python workflow that drives all three.

The harness wars are over. You probably already have your favorite (or two, or three). Aegis lets you keep them — and run them as a team.

Five primitives for agent coordination

Each primitive has one verb and lands the same way in the receiving agent's transcript: as a ✉ block with a sender tag, timestamp, and a short body preview. One delivery channel, five wake patterns.

→ Inbox — send context to a peer

Any agent can hand off to any other live agent. Fire-and-forget; the recipient gets a normal user-message turn tagged with the sender's handle. Use when you want a specific peer to pick up where you left off.

aegis_handoff(target_handle="reviewer", from_handle="impl",
              context="PR ready at branch feat/x — please review")
# → reviewer's transcript:
#   ✉ from agent:impl · 17:42:03Z
#     PR ready at branch feat/x — please review

⏳ Queue — spawn a worker on demand

Enqueue a task to a named queue and the substrate spawns a fresh agent of the queue's configured profile, runs the payload as its opening turn, and (with callback=true) delivers the worker's final result back to your inbox. Producer keeps working between enqueue and callback. Generalizes delegation: parallelism, max-in-flight caps, restart safety, all built in.

aegis_enqueue(queue="review", payload="…full self-contained prompt…",
              from_handle="impl", callback=True)
# → {task_id: 01HK…, queued_position: 1}
# …minutes later, in impl's transcript:
#   ✉ from queue:review · task#01HK… · ok · 17:46:11Z
#     PR looks clean. Two nits flagged in the diff comments…

▦ Canvas — collaborate on a shared document

Open a shared markdown file. Multiple agents read it, write sections of it, subscribe to it. Each write wakes every other subscriber with a diff-aware notification. The classical blackboard pattern — terminal- native, MCP-driven, file-backed (you can grep it, commit it, open it in your editor).

# PM
aegis_canvas_open(name="report-q3", file="vault/reports/q3.md",
                  from_handle="pm")
aegis_canvas_subscribe(name="report-q3", from_handle="pm")

# Researcher (in another tab, after a handoff)
aegis_canvas_write_section(name="report-q3", section="data",
                           content="Q3 numbers came in stronger…",
                           from_handle="researcher")
# → PM's transcript:
#   ✉ from canvas:report-q3 · 20:30:00Z
#     section "data" · written by agent:researcher (+18 / -3 lines)
#     ──
#     Q3 numbers came in stronger than projected…

▮ Terminal — share a live shell

Spawn a PTY-backed shell that any agent (or Alex) can run commands on, send raw keystrokes to, and subscribe to. Command boundaries are detected from OSC 133 shell-integration markers; every finalized command lands in an append-only JSONL ledger and wakes subscribers through the same ✉ channel.

# PM
aegis_term_spawn(name="build", from_handle="pm")
aegis_term_subscribe(name="build", from_handle="pm")

# builder (after a handoff)
rec = aegis_term_run(name="build", cmd="pytest -q",
                     from_handle="builder")
# → PM's transcript:
#   ✉ from term:build · 14:03:25Z
#     $ pytest -q  · run by agent:builder
#     exit 0 · 4.20s
#     ──
#     6 passed in 4.18s

⟳ Workflow — deterministic Python orchestration

When the dance has to be reliable — TDD loops, bug triage, multi-step plans, anything where retries with feedback matter — wrap it in a workflow. Plain Python at the top of the stack. Calls agents, runs bash predicates, retries with feedback, captures structured output.

@workflow("tdd-cycle")
async def tdd_cycle(engine, *, feature: str) -> str:
    impl = await engine.spawn("implementer")
    await engine.send(impl, f"Write a failing test for: {feature}")
    await engine.bash_predicate(
        f"pytest tests/ -k {feature} 2>&1 | grep -E 'FAIL|ERROR'",
        retry_with="The test should fail because the feature isn't built yet")
    await engine.send(impl, "Now implement it.")
    await engine.bash_predicate(
        f"pytest tests/ -k {feature}",
        retry_with="Tests are still failing. Output:\n{stdout}")
    reviewer = await engine.spawn("reviewer")
    return await engine.send(reviewer, "Final review of branch.")

Triggered by any agent: aegis_run_workflow(name="tdd-cycle", kwargs={"feature": "rate_limit"}). Workflows sit at the top of the stack — they span agents, they own the loop, they're the right tool when the spec is "follow this exact procedure" rather than "figure it out."

The aegis.workflows package ships four seed workflows registered on import: brainstorm_to_spec (Q/A → spec doc), execute_plan (parse plan → dispatch implementer per task with durable resume), review_branch (parallel reviewer fan-out → report), and tdd_cycle (predicate-driven TDD loop). See docs/workflows.md.

What else is in the box

• Multi-tab TUI. Generated alliterating handles (lucid-knuth, wry-hopper) for agents, purpose names (build, db) for terminals. State dots, sticky *, terminal bell when a backgrounded agent finishes. Click any block to copy it.
• Honest metrics. True input (incl. cache) with cached %, output, tool calls, per-turn and per-session wall-clock. Provisional while streaming, exact at turn end. No log scraping anywhere.
• Queue dashboard. Always-on one-line strip above the status bar shows live per-queue depth and the most recent in-flight worker. Ctrl+D expands into a full-screen modal with QUEUES / IN-FLIGHT / QUEUED / RECENT bands and a live assistant-text tail.
• Session persistence. aegis reopens the last workspace by default — agent tabs, terminal tabs, profiles, order, with each underlying session genuinely resumed (model memory intact). aegis --clean opts out.
• Workflow catalog. aegis.workflows ships four ready-to-use seeds (brainstorm_to_spec, execute_plan, review_branch, tdd_cycle); importing them registers. Engine offers ask_human, explicit checkpoint + durable resume, bash_predicate retry loops, and parallel fan-out.
• Headless + Telegram. aegis serve runs the SessionManager + MCP plane without a TUI. Add a Telegram token to drive the team from your phone.
• MCP plane. Every spawned agent is injected with the aegis MCP server: orientation (aegis_meta), session listing, handoff, queue dispatch, canvas ops, terminal ops, workflow invocation. One consistent surface across providers. With --strict-mcp-config, aegis is the only MCP server the spawned agent sees.

Install

pip install aegis-harness        # or: uv pip install aegis-harness

Requires Python 3.13+ and at least one of: claude, gemini, or opencode on your PATH, signed-in.

Quickstart

aegis init     # interactive wizard — detects installed CLIs, writes .aegis.py
aegis          # full-screen TUI

The wizard finds whichever agent CLIs you have installed and walks you through picking a model, permission mode, and optional queues. The generated .aegis.py is plain Python — edit it freely afterward.

Keys

Key	Action
Enter	Send
Ctrl+T / Ctrl+N	New tab (default agent) / new tab (pick agent)
Ctrl+E	New terminal tab (term:<name>)
Ctrl+W	Close tab (last → quit)
Ctrl+1..9 / Ctrl+Tab / Ctrl+←→	Switch tabs
Ctrl+K	Toggle terminal-tab input between run and raw mode
Ctrl+D	Open / close the queue dashboard
Escape	Interrupt the active turn (or dismiss a modal)
Click on a block	Copy that message / tool result to clipboard
Ctrl+Q	Quit

A backgrounded tab that finishes shows a * and rings the bell.

Configuration

.aegis.py is plain Python. The wizard writes one for you; here's the shape:

from aegis import Agent, ClaudeCode, GeminiCLI, OpenCode

agents = {
    "default":  Agent(provider=ClaudeCode(model="opus", effort="high",
                                           permission="auto")),
    "reviewer": Agent(provider=ClaudeCode(model="sonnet",
                                           permission="read")),
    "fast":     Agent(provider=GeminiCLI(model="gemini-3-flash-preview",
                                          permission="full")),
    "oss":      Agent(provider=OpenCode(model="opencode/kimi-k2.6",
                                         permission="full")),
}
default_agent = "default"

queues = {
    "review": {"agent": "reviewer", "max_parallel": 2},
    "fast":   {"agent": "fast",     "max_parallel": 4},
}

Full reference: Configuration.

Headless + Telegram

aegis serve runs the SessionManager and MCP plane without the TUI; add a Telegram token to drive it from your phone:

# .aegis.py
telegram_token = "…"        # or set AEGIS_TELEGRAM_TOKEN
telegram_chat_id = 123456   # the single allowed chat

Routing inside the chat:

• /new [agent] — spawn a new session
• /close [handle] — close a session
• /interrupt — interrupt the active turn
• /<handle> text… — one-shot to a specific session
• bare text — sent to the active session

A systemd unit template lives at scripts/aegis-serve.service.

Docs

Full documentation: https://apiad.github.io/aegis/

• Install
• Usage
• Configuration
• Drivers — Claude / Gemini / OpenCode
• Queues — inter-agent delegation
• Canvas — shared markdown blackboard
• Terminals — shared live PTY
• Workflows — Python orchestration + catalog
• MCP plane — the tool surface
• Architecture
• Roadmap
• API reference

Status

Beta. Personal-infrastructure-grade, evolves fast. Expect change before 1.0. See the roadmap for what's next.

License

MIT — see LICENSE.