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OpenSDL: Skill for Claude Code

.agents/skills/add-capability/SKILL.md

add-capability is a skill for Claude Code, Codex from fl-sean03/OpenSDL. It costs 32 tokens per session (234 once invoked), scanned A, original, Apache-2.0.

A workflow for adding a typed capability contract to a software project. A capability contract describes an operation's inputs, outputs, units, risks, side effects, time limits, retries, and simulator behavior.

In plain words
What is it for?
Use it when introducing or changing an executable laboratory operation, including its implementation, public schema, simulation cases, and validation tests.
Why use it?
It keeps a new laboratory operation consistent across adapters, schemas, and tests instead of leaving parts of the system out of sync.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

This is fl-sean03/OpenSDL's own configuration. It tells Claude Code and Codex how to work on OpenSDL itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything OpenSDL configures →

not rated 108repo +1 5d ago A scan SkillSpector: pass 32 tokens original Apache-2.0
View source ↗ fl-sean03/OpenSDL seanflorez.com
Reuse

Borrowing it

Nothing to install: this file belongs to fl-sean03/OpenSDL. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/fl-sean03/OpenSDL/main/.agents/skills/add-capability/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/fl-sean03/OpenSDL

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for add-capability

README.md
[![agentmods](https://agentmods.dev/badge/skills/fl-sean03/opensdl/add-capability/github.svg)](https://agentmods.dev/skills/fl-sean03/opensdl/add-capability)
Your own site
<a href="https://agentmods.dev/skills/fl-sean03/opensdl/add-capability"><img src="https://agentmods.dev/badge/skills/fl-sean03/opensdl/add-capability/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.

agentmods 80×15 button for add-capability

Your own site · 80×15
<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="Reviewed on agentmods" width="80" height="20"></a>
Per session 32 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 234 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00032 $0.00234
Opus 5.5 $0.00013 $0.00094
Sonnet 5.5 $0.00006 $0.00047
Haiku 4.5 $0.00003 $0.00023

Measured 2mo ago against content hash 4fcf3d60858f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (run.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

.agents/skills/add-capability/SKILL.md · 33 lines

What it actually says

Add a capability

Inputs

  • namespaced capability identifier
  • display name
  • destination directory, default capabilities

Procedure

  1. Run .agents/skills/add-capability/run.sh CAPABILITY_ID "DISPLAY NAME" [DESTINATION].
  2. Define typed inputs, outputs, units, resources, side effects, risk class, timeout, retries, and simulator status.
  3. Implement the contract in at least one simulator-capable adapter.
  4. Add valid, invalid, workflow, and conformance cases.
  5. Regenerate public schemas and inspect propagation impact.
  6. 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.

Files

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.

Changes

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.

  1. 2mo ago First seen · 33 lines · 32 tokens per session scan A 4fcf3d60858f

Subscribe to this mod's changes

add-capability is a skill published in the GitHub repository fl-sean03/OpenSDL (108 stars, last pushed 5d ago), licensed Apache-2.0. It adds 32 tokens to every session and 234 once invoked, about $0.0001 per session on Opus 5.5. 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.

Building agentsPythonScientificautonomous-laboratorylab-automationreproducibilityscientific-computingself-driving-labs
Related

add-capability compared with skills from other repositories

add-capability next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
add-capabilityfl-sean03/OpenSDLSkill1085d agoApache-2.0A32Claude Code, Codex
scitexscitex-ai/scitex-pythonSkill86yesterdayAGPL-3.0A123Claude Code
stx.cliscitex-ai/scitex-pythonSkill86yesterdayAGPL-3.0A33Claude Code, Codex
xarray-netcdfxjtulyc/awesome-rosetta-skillsSkill356mo agononeA40Claude Code, Codex
jupyter-notebookNousResearch/hermes-agentSkill261kyesterdayMITA18Claude Code, Codex
pennylaneK-Dense-AI/scientific-agent-skillsSkill56k4d agoMITA74Claude Code
cuequivariance-jaxNVIDIA/skillsSkill3.9kyesterdayApache-2.0A38Claude Code, Codex