observer

observer is a skill for Claude Code from magnus919/agent-skills. It costs 30 tokens per session (1,022 once invoked), scanned A, original, MIT.

A passive session observer that infers a user's work process from earlier messages. It stays inactive until the user uses a workflow-analysis phrase.

In plain words
What is it for?
It helps identify and model a workflow, then pass that model to another tool that can build a workflow bundle.
Why use it?
It removes the need to describe a workflow separately when the relevant steps are already present in the conversation.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the workflow-architect plugin — 3 skills shipped together

Good fit It helps identify and model a workflow, then pass that model to another tool that can build a workflow bundle.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/magnus919/agent-skills/observer
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 magnus919/agent-skills --skill observer
Clone the repo
git clone --depth 1 https://github.com/magnus919/agent-skills

Made for: Claude Code.

Or install workflow-architect, the plugin that ships this one along with the rest of its 3 skills.

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 observer

README.md
[![agentmods](https://agentmods.dev/badge/skills/magnus919/agent-skills/observer/github.svg)](https://agentmods.dev/skills/magnus919/agent-skills/observer)
Your own site
<a href="https://agentmods.dev/skills/magnus919/agent-skills/observer"><img src="https://agentmods.dev/badge/skills/magnus919/agent-skills/observer/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 observer

Your own site · 80×15
<a href="https://agentmods.dev/skills/magnus919/agent-skills/observer"><img src="https://agentmods.dev/badge/skills/magnus919/agent-skills/observer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,022 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. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Agent Snooping · line 100
    Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.
    Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
How audits are shown
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 $0.00030 $0.01022
Opus 5.5 $0.00012 $0.00409
Sonnet 5.5 $0.00006 $0.00204
Haiku 4.5 $0.00003 $0.00102

Measured 5d ago against content hash fa9a3a5c528c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

observer 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 5d ago.

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.

workflow-architect/skills/observer/SKILL.md · 116 lines

How it starts

The opening of the file, as written. The whole thing — 116 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Observer — Passive Workflow Discovery

This is the passive observation mode of workflow-architect. Unlike the interviewer, which asks questions, the observer watches and infers.

How It Works

  1. The observer loads silently via /workflow-architect passive
  2. It does nothing until a trigger phrase is detected
  3. On trigger, it scans the current session's message history using a structured inference prompt
  4. The output is a workflow state model (same structure as the interviewer produces), which feeds into the bundle-builder sub-skill

Trigger Phrases

The observer activates when the user says any of these:

  • "catalog my workflow"
  • "what's my workflow"
  • "analyze my process"
  • "figure out what I do"
  • "work it out from what I just did"

If none of these are detected in the user's message, the observer remains dormant. Do not announce its presence — the user may not remember loading it in passive mode.

Activation Protocol

When a trigger phrase is detected:

  1. Check session depth. Count substantive user messages (excluding greetings, meta-comments about the agent, and one-word replies). If fewer than 5 substantive messages, respond:

    "I don't have enough session context to work with yet. I've seen about
    [N] substantive turns, and I need more to find reliable patterns.
    Try active interrogation mode instead: /workflow-architect"
    
  2. If enough context exists, run inference. Use the following structured prompt against the session context. You may use session_search or browser console to review the session transcript if needed.

    You are analyzing a session transcript to extract workflow patterns.
    Look at the user's messages and your responses. Identify:
    
    1. ENTRY PATTERNS — How did the session start? What was the user's
       first request? Was it a check-in, a specific task, a question?
    
    2. PHASES — Where did the session shift focus? What triggered each
       shift? (A new request, a status check, a tool output?)
    
    3. BRANCHING — Were there decision points where the user could have
       gone in different directions? What determined the direction taken?
    
    4. TOOLS — What tools did the user reach for? What commands did they
       ask you to run? What contexts did they reference?
    
    5. PAIN POINTS — Were there moments of friction? (Repeated corrections,
       stops-and-restarts, "no, not that" type corrections)
    
    6. EXIT — How did the session end (or approach ending)? Was it a
       natural completion, an interruption, or something else?
    
    Return your findings as a structured JSON document matching the
    workflow-architect state model format.
    

Read the full file on GitHub · 116 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. 5d ago Changed fa9a3a5c528c
  2. 1mo ago First seen · 116 lines · 30 tokens per session scan A 54116234abd9

Subscribe to this mod's changes

observer is a skill published in the GitHub repository magnus919/agent-skills (154 stars, last pushed today), licensed MIT. It adds 30 tokens to every session and 1,022 once invoked, about $0.0001 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 2026-09-05.

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