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/fl-sean03/opensdl/add-capabilitynpx skills add fl-sean03/OpenSDL --skill add-capabilitygit clone --depth 1 https://github.com/fl-sean03/OpenSDLWrote 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/fl-sean03/opensdl/add-capability)<a href="https://agentmods.dev/skills/fl-sean03/opensdl/add-capability"><img src="https://agentmods.dev/badge/skills/fl-sean03/opensdl/add-capability.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 | $0.00032 | $0.00234 |
| Opus 5 | $0.00016 | $0.00117 |
| Sonnet 5 | $0.00006 | $0.00047 |
| Haiku 4.5 | $0.00003 | $0.00023 |
Grade A, and why
add-capability 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.
What it actually says
Add a capability
Inputs
- namespaced capability identifier
- display name
- destination directory, default
capabilities
Procedure
- Run
.agents/skills/add-capability/run.sh CAPABILITY_ID "DISPLAY NAME" [DESTINATION]. - Define typed inputs, outputs, units, resources, side effects, risk class, timeout, retries, and simulator status.
- Implement the contract in at least one simulator-capable adapter.
- Add valid, invalid, workflow, and conformance cases.
- Regenerate public schemas and inspect propagation impact.
- Run focused tests and repository validation.
Completion
The contract is namespaced, typed, implemented, exported where public, and covered through simulation and conformance tests.
Stop conditions
Stop if the operation lacks a semantic boundary, unit contract, risk class, or failure model. Move runtime lifecycle changes into the core or runtime design before adding the capability.
What ships with it
1 file 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.
- 5d ago First seen · 33 lines · 32 tokens per session scan A 4fcf3d60858f
add-capability is a skill published in the GitHub repository fl-sean03/OpenSDL (102 stars, last pushed 5d ago), licensed Apache-2.0. It adds 32 tokens to every session and 234 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 2026-08-30.
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