agent-observe

agent-observe is a skill for Claude Code, Codex from 7df-lab/devo. It costs 41 tokens per session (631 once invoked), scanned A, original, MIT.

A read-only tool for viewing an agent's parent, siblings, and direct children, along with their status and limited recent messages. It cannot change or control those sessions.

In plain words
What is it for?
Use it to discover reachable agents and inspect family-session status or recent message previews.
Why use it?
It provides visibility into related agents without allowing accidental changes to their work.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to discover reachable agents and inspect family-session status or recent message previews.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/7df-lab/devo/agent-observe
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add 7df-lab/devo --skill agent-observe
Clone the repo
git clone --depth 1 https://github.com/7df-lab/devo

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for agent-observe

README.md
[![agentmods](https://agentmods.dev/badge/skills/7df-lab/devo/agent-observe/github.svg)](https://agentmods.dev/skills/7df-lab/devo/agent-observe)
Your own site
<a href="https://agentmods.dev/skills/7df-lab/devo/agent-observe"><img src="https://agentmods.dev/badge/skills/7df-lab/devo/agent-observe/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for agent-observe

Your own site · 80×15
<a href="https://agentmods.dev/skills/7df-lab/devo/agent-observe"><img src="https://agentmods.dev/badge/skills/7df-lab/devo/agent-observe.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 631 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00041 $0.00631
Opus 5.5 $0.00016 $0.00252
Sonnet 5.5 $0.00008 $0.00126
Haiku 4.5 $0.00004 $0.00063

Measured 10d ago against content hash 156aa812ed00, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

agent-observe scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (src/agent_observe/__init__.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

crates/skills/assets/bundled/agent-observe/SKILL.md · 61 lines

How it starts

The opening of the file, as written. The whole thing — 61 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Agent Observe

Observe the current agent's nuclear family through the local daemon: parent, siblings, direct children, and self. list_agents is the one family roster and covers every member agent_message.send can reach. get_agent and recent_messages hydrate an inactive child before reading it. They cannot read a root sibling that has no live session in this worker. This skill is read-only: it can list family sessions, inspect one session, and fetch bounded recent message previews. It cannot prompt, steer, clear, kill, rename, or otherwise mutate another session.

Call directly from the kernel:

roster = await agent_observe.list_agents()
child = next(
    (
        item
        for item in roster.get("agents", [])
        if item.get("relationship") == "child"
    ),
    None,
)
if child is not None:
    name = child.get("sessionName") or child["sessionId"]
    worker = await agent_observe.get_agent(name)
    recent = await agent_observe.recent_messages(name, limit=6)

API

  • await agent_observe.list_agents() returns current and agents, the full nuclear family: parent, siblings, and direct children, active or not. Each agent carries sessionId, optional sessionName, relationship (parent/sibling/child/self), status, isSessionActive, and the counts and message previews known for it: latestMessage for a live session, firstMessage for an inactive child. A member with no live session has no activeSessionId and no live detail; address it with agent_message.send using its relationship plus its sessionName, or its sessionId when the member has no name.
  • await agent_observe.get_agent(target) returns agent, where agent contains one live agent summary. target is resolved like other live-session selectors: active id, session id/name, or unambiguous suffix.
  • await agent_observe.recent_messages(target, limit=8, max_chars=800) returns up to limit recent bounded message previews for the target session. limit must be 1-50, and max_chars must be 80-2000.

Read the full file on GitHub · 61 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 10d ago First seen · 61 lines · 41 tokens per session scan A 156aa812ed00

Subscribe to this mod's changes

agent-observe is a skill published in the GitHub repository 7df-lab/devo (321 stars, last pushed yesterday), licensed MIT. It adds 41 tokens to every session and 631 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-06.

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