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 ArabelaTso/Skills-4-SE --skill specification-generatorgit clone --depth 1 https://github.com/ArabelaTso/Skills-4-SEWrote 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/arabelatso/skills-4-se/specification-generator)<a href="https://agentmods.dev/skills/arabelatso/skills-4-se/specification-generator"><img src="https://agentmods.dev/badge/skills/arabelatso/skills-4-se/specification-generator/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.
<a href="https://agentmods.dev/skills/arabelatso/skills-4-se/specification-generator"><img src="https://agentmods.dev/badge/skills/arabelatso/skills-4-se/specification-generator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00079 | $0.05712 |
| Opus 5 | $0.00039 | $0.02856 |
| Sonnet 5 | $0.00016 | $0.01142 |
| Haiku 4.5 | $0.00008 | $0.00571 |
Grade A, and why
specification-generator 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.
How it starts
The opening of the file, as written. The whole thing — 921 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Specification Generator
Systematically generate formal specifications from code and requirements. Produces preconditions, postconditions, invariants, and behavioral contracts that enable verification, documentation, and design-by-contract programming.
Core Capabilities
1. Precondition Generation
Define required conditions before execution:
- Parameter validation - Valid ranges, types, states
- Object state requirements - Required object states
- Resource availability - Files exist, connections open
- Authorization checks - Permission requirements
- Null safety - Non-null parameter requirements
- Invariant satisfaction - Class invariants must hold
2. Postcondition Generation
Specify guaranteed outcomes after execution:
- Return value constraints - Valid return ranges and properties
- State modifications - How object state changes
- Side effects - File writes, database updates
- Exception conditions - When exceptions are thrown
- Resource management - Resources properly released
- Invariant preservation - Invariants still hold
3. Invariant Generation
Identify properties that always hold:
- Class invariants - Properties true for all instances
- Loop invariants - Properties preserved by iterations
- Data structure invariants - Consistency conditions
- Representation invariants - Internal consistency
- Temporal invariants - Time-based properties
4. Contract Generation
Create complete behavioral specifications:
- Method contracts - Full pre/post conditions
- Interface contracts - API behavioral guarantees
- Type contracts - Type-level properties
- Protocol contracts - Valid call sequences
- Frame conditions - What doesn't change
Specification Generation Workflow
Step 1: Analyze Code or Requirements
Understand what needs to be specified:
For existing code:
- Read function/method implementation
- Identify parameters and return type
- Find state modifications
- Detect resource usage
- Locate error conditions
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 · 921 lines · 79 tokens per session scan A 7c185aa2ffca
specification-generator is a skill published in the GitHub repository ArabelaTso/Skills-4-SE (251 stars, last pushed 19d ago), licensed Apache-2.0. It adds 79 tokens to every session and 5,712 once invoked, about $0.0004 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 2026-09-03.
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