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 skills/josix/agent-flow/agent-behavior-constraintsnpx skills add josix/agent-flow --skill agent-behavior-constraintsgit clone --depth 1 https://github.com/josix/agent-flowWrote 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/skills/josix/agent-flow/agent-behavior-constraints)<a href="https://agentmods.dev/skills/josix/agent-flow/agent-behavior-constraints"><img src="https://agentmods.dev/badge/skills/josix/agent-flow/agent-behavior-constraints.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 | $0.00041 | $0.01537 |
| Opus 5 | $0.00020 | $0.00768 |
| Sonnet 5 | $0.00008 | $0.00307 |
| Haiku 4.5 | $0.00004 | $0.00154 |
Grade A, and why
agent-behavior-constraints 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 4d 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.
How it starts
The opening of the file, as written. The whole thing — 160 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Behavior Constraints
Define behavioral rules governing model selection, tool access, and operational guardrails.
Overview
This skill consolidates four core constraint domains:
- Model Routing - Which AI model powers each agent
- Tool Access - What tools each agent can use
- Behavioral Guardrails - Non-negotiable rules for all agents
- MCP Tool Preferences - Domain-specific tool selection
Apply these constraints when spawning agents, checking permissions, or reviewing behavior.
Model Routing
| Agent | Model | Rationale |
|---|---|---|
| Senku (Planner) | Opus | Strategic planning needs deep reasoning |
| Riko (Explorer) | Opus | Complex exploration needs thorough analysis |
| Loid (Executor) | Sonnet | Balanced speed and capability for implementation |
| Lawliet (Reviewer) | Sonnet | Fast iteration for review feedback loops |
| Alphonse (Verifier) | Sonnet | Quick verification command execution |
| Speedwagon (Authoring) | Sonnet | Fast content authoring for explainer modules |
Decision Rule:
- Opus for strategic/planning tasks requiring deep reasoning
- Sonnet for execution/verification tasks requiring speed
See Model Selection Guide for detailed criteria.
Tool Access Matrix
Riko (Explorer): [Read] [Grep] [Glob] [Bash]* [WebSearch] [WebFetch]
Senku (Planner): [Read] [Grep] [Glob] [TodoWrite]
Loid (Executor): [Read] [Write] [Edit] [Bash] [Grep] [Glob]
Lawliet (Reviewer): [Read] [Grep] [Glob] [Bash]
Alphonse (Verifier): [Read] [Bash] [Grep]
Speedwagon (Authoring):[Read] [Grep] [Glob] [Write]† [Edit]† [Bash]‡
Key Restrictions:
- Only Loid can modify files (Write, Edit) — except Speedwagon's scoped authoring exception
- Only Riko can access web (WebSearch, WebFetch)
- Only Senku can manage tasks (TodoWrite)
Footnotes:
-
- Riko's Bash access is limited to AST analysis tools only (ast-grep, tree-sitter, language parsers)
- † Speedwagon Write/Edit scoped to
explain-out/and.claude/explain-briefs/only - ‡ Speedwagon Bash limited to
bash scripts/compile-explain.shonly
What ships with it
4 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.
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.
- 4d ago First seen · 160 lines · 41 tokens per session scan A 383b35d8d19a
agent-behavior-constraints is a skill published in the GitHub repository josix/agent-flow (7 stars, last pushed 19d ago), licensed MIT. It adds 41 tokens to every session and 1,537 once invoked, about $0.0002 per session on Opus 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 2026-08-31.
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