agtop

A terminal monitor for AI coding agents.

top for the AI-coding era. Walks /proc, parses on-disk session transcripts from Claude Code, OpenAI Codex, Google Gemini, Block Goose, and Aider, and renders per-agent CPU, memory, status, current tool, in-flight subagents, token usage, and estimated cost in a project-grouped TUI.

and the agent detail popup — current tool, model, in-flight subagents, token usage, and a live transcript preview:

Install

The npm package is a thin Node shim that downloads the matching prebuilt from the GitHub Release for the host platform / arch. cargo install is the universal fallback.

Usage

agtop                       full TUI
agtop --once                one-shot snapshot, like `top -b -n 1`
agtop -1 --top 10           top 10 agents and exit
agtop --json                machine-readable JSON
agtop --watch               one summary line per tick (no TUI, pipes cleanly)
agtop --filter aider        only agents matching label / cmdline / cwd
agtop --sort tokens         sort by token consumption
agtop --prices prices.toml  override the bundled model price table
agtop -m "myagent=python.*my_agent\.py"   add a custom matcher

Run agtop --help for the full flag list.

What it does

• Walks /proc (sysinfo on macOS / Windows / *BSD) every tick and classifies each process against 20 built-in agent matchers — Claude Code, OpenAI Codex, Goose, Aider, Gemini, Cursor, Continue, Opencode, Copilot CLI, Cody, Amp, Crush, Mods, sgpt, llm, Ollama, Fabric, plus custom regex via -m label=regex.
• Reads on-disk session transcripts:
  • ~/.claude/projects/<encoded-cwd>/<session>.jsonl for Claude Code
  • ~/.codex/sessions/<YYYY>/<MM>/<DD>/<rollout>.jsonl for Codex
  • ~/.config/goose/sessions/ for Goose
  • <cwd>/.aider.chat.history.md for Aider
  • ~/.gemini/sessions/<id>.json for Gemini
• Extracts current tool, current task, model name, in-flight Task subagents, token usage (input + output + cache reads), and a recent-activity tail (assistant prose, tool calls, tool results).
• Estimates cost from a 1,800-model price table synced nightly from LiteLLM's community registry, with explicit local-model handling for Ollama / vLLM / llama.cpp / LM Studio (zero-cost — the model runs on the user's hardware).
• Renders a project-grouped, color-coded TUI with smooth braille charts for CPU / memory / tokens-rate, status distribution bars, an activity rail, and a Claude sessions panel.

Status badges

Every agent row carries one of seven badges. Process state and session activity are blended so an agent mid-generation isn't reported as idle.

Processes invoked with --dangerously-skip-permissions, --no-permissions, --allow-dangerous, --yolo, or sudo {claude,codex} are flagged with a warm-amber ▍ left-edge bar before the agent label. The flag is also exposed in --json as agents[].dangerous: bool.

TUI controls

The detail popup ends with a Live preview box showing the last 6–8 events from the session transcript — assistant prose (›), tool calls (→), and tool results (←).

Architecture

flowchart LR
    subgraph Sources["Data sources"]
        direction TB
        P["/proc/&lt;pid&gt; (Linux)<br/>sysinfo (macOS / Windows / *BSD)"]
        CL["~/.claude/projects/&lt;cwd&gt;/&lt;session&gt;.jsonl"]
        CO["~/.codex/sessions/YYYY/MM/DD/&lt;rollout&gt;.jsonl"]
        GS["~/.config/goose/sessions"]
        AI["&lt;cwd&gt;/.aider.chat.history.md"]
        GE["~/.gemini/sessions/&lt;id&gt;.json"]
    end

    subgraph Vendors["Vendor enrichers"]
        Claude["claude.rs"]
        Codex["codex.rs"]
        Goose["goose.rs"]
        Aider["aider.rs"]
        Gemini["gemini.rs"]
        Generic["generic.rs (fallback)"]
    end

    subgraph Pricing["Pricing"]
        PD["pricing_data.rs<br/>(auto-generated from LiteLLM)"]
        PR["pricing.rs<br/>+ curated overlay<br/>+ local-model classifier"]
    end

    subgraph Core["Collector"]
        Coll["collector.rs<br/>EWMA smoothing<br/>per-pid CPU history<br/>stable sort<br/>price + basis lookup"]
        Snap["Snapshot"]
    end

    subgraph UI["Surfaces"]
        TUI["ratatui TUI<br/>(ui.rs · theme.rs)"]
        JSON["--json"]
        Watch["--watch"]
    end

    P --> Coll
    CL --> Claude
    CO --> Codex
    GS --> Goose
    AI --> Aider
    GE --> Gemini

    Claude --> Coll
    Codex --> Coll
    Goose --> Coll
    Aider --> Coll
    Gemini --> Coll
    Generic --> Coll

    PD --> PR
    PR --> Coll

    Coll --> Snap
    Snap --> TUI
    Snap --> JSON
    Snap --> Watch

JSON output

agtop --json writes one snake_case JSON object to stdout. Stable schema, suitable for jq, dashboards, or alerting.

{
  "now": 1777439481861,
  "platform": "linux",
  "sys_cpus": 32,
  "mem_total": 132499206144,
  "aggregates": {
    "cpu": 17.2, "mem_bytes": 4257710080,
    "active": 13, "busy": 1, "waiting": 4, "completed": 5,
    "subagents": 2, "project_count": 11,
    "tokens_total": 95199819, "tokens_input": 94971751, "tokens_output": 228068,
    "cost_usd": 1441.68
  },
  "agents": [
    {
      "pid": 404872, "label": "claude", "status": "busy",
      "project": "zk-rollup-prover",
      "model": "claude-sonnet-4-7",
      "current_tool": "Bash", "current_task": "nargo prove --witness witness.tr",
      "subagents": 1, "in_flight_subagents": ["code-reviewer: review the auth refactor"],
      "tokens_total": 5893647, "cost_usd": 18.31, "cost_basis": "api",
      "dangerous": false,
      "cpu": 16.3, "rss": 626491392, "uptime_sec": 345600,
      "recent_activity": [
        "› Reviewing the diff",
        "→ Bash: nargo prove --witness witness.tr",
        "← witness verified"
      ]
    }
  ],
  "projects": [/* per-project rollups */],
  "sessions": {/* counts + recent_tasks */},
  "history": {/* 60-tick series for cpu / mem / tokens_rate / etc. */},
  "activity": [/* spawn / exit events */]
}

The cost_basis field is one of:

Cost estimation

agtop ships with ~1,800 model SKUs in src/pricing_data.rs, auto-generated from LiteLLM's community price registry — the de-facto cross-vendor pricing source used by dozens of agent tools. A nightly GitHub Action (.github/workflows/sync-prices.yml) re-runs the sync and opens a PR if prices have drifted, so each tagged release ships with current numbers.

On top of the synced data, pricing.rs layers a small curated overlay (canonical Anthropic / OpenAI / Google SKUs) and an explicit local-model classifier: model strings matching ollama/, lmstudio/, vllm/, llamacpp/, localhost:, huggingface/, etc., short-circuit to cost_basis = local and cost_usd = 0.0 — surfaced in the TUI as local and in the popup as "no API cost — model runs on this machine". No more silent guesses for self-hosted models.

Lookup is suffix-tolerant: claude-sonnet-4-7-20260101 resolves to claude-sonnet-4-7, then claude-sonnet-4, then claude-sonnet, so dated revisions don't need to be tracked individually.

The --once footer and the help overlay both stamp the bundled price date so you always know the snapshot age:

prices as of 2026-04-29 (litellm community registry) — `--prices PATH` to override

Override or extend with --prices prices.toml:

# USD per 1,000,000 tokens.

[models."my-private-model"]
input_per_mtok  = 0.50
output_per_mtok = 2.00

User entries merge on top of the bundled defaults; user values win on key collision.

To regenerate the bundled table on demand:

python3 scripts/sync_prices.py        # writes src/pricing_data.rs
python3 scripts/sync_prices.py --check # exit 1 if upstream drifted

Custom matchers

# repeatable -m flag
agtop -m "internal-bot=python.*src/agent\.py" \
      -m "rag-worker=node.*workers/rag\.js"

# or via env
export AGTOP_MATCH="internal-bot=python.*src/agent\.py"

agtop --list-builtins prints the canonical 20-pattern list.

Platforms

CI runs cargo check --release across all 7 mainstream targets (linux x86_64 + aarch64, macos x86_64 + aarch64, windows-msvc, windows-gnu, freebsd-x86_64) on every push.

Repo layout

agtop/
├── Cargo.toml · Cargo.lock
├── src/                              19 source files · ~5.2 k lines · 15 tests
│   ├── main.rs · cli.rs · ui.rs · theme.rs · collector.rs
│   ├── pricing.rs · pricing_data.rs (auto-generated)
│   ├── proc_.rs · sysbackend.rs
│   ├── claude.rs · codex.rs · goose.rs · aider.rs · gemini.rs · generic.rs
│   └── sessions.rs · matchers.rs · model.rs · format.rs
├── scripts/
│   └── sync_prices.py                LiteLLM → pricing_data.rs sync
├── packages/{npm,deb,pacman}/        build.sh per format
├── homebrew/agtop.rb                 formula + tap setup
├── .github/workflows/                ci.yml · release.yml · sync-prices.yml
└── docs/                             screenshots + capture pipeline

Distribution channels

License

MIT — see LICENSE.