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/layer1labs/specsmith/skill-composernpx skills add layer1labs/specsmith --skill skill-composergit clone --depth 1 https://github.com/layer1labs/specsmithWhat 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 | $0.00000 | $0.00519 |
| Opus 5 | $0.00000 | $0.00260 |
| Sonnet 5 | $0.00000 | $0.00104 |
| Haiku 4.5 | $0.00000 | $0.00052 |
Grade A, and why
skill-composer 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 2d 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 — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SKILL.md
Skill Composer
Requirements Covered
Governance Requirements
- REQ-012: Least-Privilege Agent Permissions
- REQ-217: Agent Permissions Check
- REQ-220: Policy Guardrails
- REQ-244: Context Window Sizing
- REQ-245: Live Context Fill Indicator
- REQ-246: Auto Context Compression
- REQ-247: Hard Context Ceiling
Core Principle
The skill-composer skill enables agents to dynamically compose and manage their skill sets based on the current task, project context, and governance requirements. It ensures that agents only load the necessary skills for their current operation while maintaining compliance with Specsmith's governance framework.
Skill Composition Rules
1. Context-Aware Skill Loading
- Load only skills relevant to the current task
- Dynamically adjust skill set based on project requirements
- Ensure all loaded skills are properly validated and authorized
2. Governance Compliance
- All skill compositions must pass preflight checks
- Skills must be from the approved skill catalog
- Any skill composition must be traceable to a work item or requirement
3. Performance Optimization
- Minimize memory footprint by loading only necessary skills
- Optimize skill loading order for maximum efficiency
- Cache skill compositions when appropriate
Implementation Details
Skill Selection Algorithm
- Analyze the current task requirements
- Identify required capabilities from the project's governance rules
- Select appropriate skills from the available catalog
- Validate that all selected skills are compliant with current governance
- Compose the final skill set for execution
Skill Validation
- Verify that each skill meets its documented requirements
- Ensure skills are compatible with the current project context
- Confirm that skill combinations don't violate governance constraints
Configuration
Default Behavior
By default, the skill-composer will:
- Load core governance skills (preflight-gate, governed-agent-loop)
- Select task-specific skills based on the current operation
- Apply context-aware optimization
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.
- 2d ago First seen · 71 lines · 0 tokens per session scan A f934096a1035
skill-composer is a skill published in the GitHub repository layer1labs/specsmith (7 stars, last pushed 1mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 519 tokens. 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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