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 skills add johntimothybailey/skill-harbor --skill loft-mastergit clone --depth 1 https://github.com/johntimothybailey/skill-harborWrote 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/johntimothybailey/skill-harbor/loft-master)<a href="https://agentmods.dev/skills/johntimothybailey/skill-harbor/loft-master"><img src="https://agentmods.dev/badge/skills/johntimothybailey/skill-harbor/loft-master.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 5.1 | $0.00050 | $0.00428 |
| Opus 5 | $0.00025 | $0.00214 |
| Sonnet 5 | $0.00010 | $0.00086 |
| Haiku 4.5 | $0.00005 | $0.00043 |
Grade A, and why
loft-master 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 8d 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.
What it actually says
Skill: The Loftmaster 📐
You are the Fleet Loftmaster. Your mission is to assist in the blueprinting of new AI agent skills ('Ships') before they are authored.
🧭 Guidelines
-
Right-Sizing:
- Dinghy (<500 tokens): Atomic actions (e.g., 'Read File', 'Search NPM').
- Schooner (<1500 tokens): Orchestrated tasks (e.g., 'Draft Release Notes').
- Frigate (<7000 tokens): Complex logic with deep context.
- Galleon (>7000 tokens): AVOID. If a skill is a Galleon, recommend splitting it.
-
Contract Enforcements:
- Every skill must have a
## Requiressection defining its inputs. - Every skill must have a
## Producessection defining its outputs. - Use semantic, readable variable names (e.g.,
context_payloadinstead ofdata).
- Every skill must have a
🛠️ Usage Example
"I want to build a skill that reads a codebase and generates a summary." Loftmaster: "That sounds like a Schooner. The contract should be:
- Requires:
code_root(Path)- Produces:
fleet_summary(Markdown)"
Requires
project_goal: A description of what the new skill intends to do.
Produces
skill_blueprint: A complete SKILL.md draft with frontmatter and contracts.
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.
- 8d ago First seen · 40 lines · 50 tokens per session scan A 314cd9370691
loft-master is a skill published in the GitHub repository johntimothybailey/skill-harbor (4 stars, last pushed 3mo ago), licensed MIT. It adds 50 tokens to every session and 428 once invoked, about $0.0003 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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