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.
npx agentmods add instructions/houarnu166/skillful-agent-system-builder/agents-mdgit clone --depth 1 https://github.com/houarnu166/skillful-agent-system-builderWrote 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.
[](https://agentmods.dev/instructions/houarnu166/skillful-agent-system-builder/agents-md)<a href="https://agentmods.dev/instructions/houarnu166/skillful-agent-system-builder/agents-md"><img src="https://agentmods.dev/badge/instructions/houarnu166/skillful-agent-system-builder/agents-md.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.06146 | $0.06146 |
| Opus 5 | $0.03073 | $0.03073 |
| Sonnet 5 | $0.01229 | $0.01229 |
| Haiku 4.5 | $0.00615 | $0.00615 |
Grade D, and why
skillful-agent-system-builder AGENTS.md scanned grade D with 2 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
- Create locked copy: jenny-draft-approved.md (chmod 444) Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
rm -rf ./temp/skillful-session/ && mkdir -p ./temp/skillful-session/ Copies of this mod
1 near-identical copy found in the catalogue:
- skillful-agent-system-builder CLAUDE.md — 97% identical, 4 lines differ
How it starts
The opening of the file, as written. The whole thing — 779 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CRITICAL INSTRUCTION
BEFORE answering ANY user request, you MUST FIRST execute 'Phase 0: Session Initialization'.
- Check if
./temp/skillful-session/exists.- If it's a new request, run the initialization commands immediately.
- ONLY THEN proceed to answering or invoking Sam. DO NOT skip this step. The Orchestrator MUST be the entry point.
Skillful Agent System Build - Orchestrator
Role: Central coordinator for 3-stage Agent+Skill system design workflow.
Project Context & Operations
Purpose: Transform user requests into production-ready Agent+Skill systems through Requirements Analysis (Sam) → Detailed Design (Jenny) → Quality Review (Will).
Tech Stack:
- Runtime: Claude Code Subagent architecture
- File Format: Markdown (Agents), YAML frontmatter (Skills)
- Dependencies: ./context/*.md (Anthropic official docs)
- Output: Start Prompt files in ./outputs/
Operational Commands:
Session Management:
# Initialize (mandatory on every new request)
rm -rf ./temp/skillful-session/ && mkdir -p ./temp/skillful-session/
# Create session metadata
cat > ./temp/skillful-session/session.json << EOF
{
"session_id": "$(date +%s)",
"started_at": "$(date -Iseconds)",
"current_stage": "init",
"fast_mode": false
}
EOF
# Check current stage
jq -r '.current_stage' ./temp/skillful-session/session.json
# Update stage
jq '.current_stage = "sam_complete"' ./temp/skillful-session/session.json > tmp.$$.json && mv tmp.$$.json ./temp/skillful-session/session.json
# Verify output
ls -1 ./outputs/*-start-prompt.md | tail -1
Subagent Invocation:
# Stage 1
Use sam-analyst subagent.
Input: {user_request, fast_mode}
Output: ./temp/skillful-session/sam-draft.md
# Stage 2
Use jenny-engineer subagent.
Input: Read ./temp/skillful-session/sam-draft.md
Output: ./temp/skillful-session/jenny-draft.md
# Stage 3
Use will-reviewer subagent.
Input: Read ./temp/skillful-session/jenny-draft.md
Output: ./outputs/{system-name}-start-prompt.md
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.
- 5d ago First seen · 779 lines · 6,146 tokens per session scan D 87b923e85528
skillful-agent-system-builder AGENTS.md is an instructions file published in the GitHub repository houarnu166/skillful-agent-system-builder (23 stars, last pushed 6mo ago), licensed MIT. It adds 6,146 tokens to every session, about $0.0307 per session on Opus 5. A static security scan graded it D with 2 findings (asks for root, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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