MCP Server Builder
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
Add a typed OpenSDL capability contract and propagate it through adapters, schemas, and tests.
Install Add Capability
$ npx skills add fl-sean03/OpenSDL --skill add-capability -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install fl-sean03/OpenSDL add-capability --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/fl-sean03/OpenSDL.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/add-capability .claude/skills/add-capability && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "add-capability" agent skill from https://github.com/fl-sean03/OpenSDL/tree/main/.agents/skills/add-capability into .claude/skills/add-capability/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-capability", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/fl-sean03/OpenSDL/tree/main/.agents/skills/add-capabilityType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add fl-sean03/OpenSDL --skill add-capability -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install fl-sean03/OpenSDL add-capability --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/fl-sean03/OpenSDL.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/add-capability .agents/skills/add-capability && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "add-capability" agent skill from https://github.com/fl-sean03/OpenSDL/tree/main/.agents/skills/add-capability into .agents/skills/add-capability/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-capability", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add fl-sean03/OpenSDL --skill add-capability -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install fl-sean03/OpenSDL add-capability --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/fl-sean03/OpenSDL.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/add-capability .cursor/skills/add-capability && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "add-capability" agent skill from https://github.com/fl-sean03/OpenSDL/tree/main/.agents/skills/add-capability into .cursor/skills/add-capability/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-capability", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/fl-sean03/OpenSDL.git --path .agents/skills/add-capability--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add fl-sean03/OpenSDL --skill add-capability -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install fl-sean03/OpenSDL add-capability --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/fl-sean03/OpenSDL.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/add-capability .gemini/skills/add-capability && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "add-capability" agent skill from https://github.com/fl-sean03/OpenSDL/tree/main/.agents/skills/add-capability into .gemini/skills/add-capability/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-capability", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install fl-sean03/OpenSDL add-capabilityInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add fl-sean03/OpenSDL --skill add-capability -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/fl-sean03/OpenSDL.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/add-capability .github/skills/add-capability && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "add-capability" agent skill from https://github.com/fl-sean03/OpenSDL/tree/main/.agents/skills/add-capability into .github/skills/add-capability/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-capability", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add fl-sean03/OpenSDL --skill add-capability -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install fl-sean03/OpenSDL add-capability --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/fl-sean03/OpenSDL.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/add-capability .opencode/skills/add-capability && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "add-capability" agent skill from https://github.com/fl-sean03/OpenSDL/tree/main/.agents/skills/add-capability into .opencode/skills/add-capability/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-capability", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
add-capability- GitHub stars
- 107
- Token cost
- ~286 tokens
- SKILL.md length
- 118 words
- Files
- 2
- Skills in repo
- 11
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Add a typed OpenSDL capability contract and propagate it through adapters, schemas, and tests.
- Works in 6 steps: Run .agents/skills/add-capability/run.sh… → Define typed inputs, outputs, units,… → Implement the contract in at least one… → …
- Changing an executable laboratory operation
- SKILL.md covers Inputs, Procedure, Completion and Stop conditions
- Runs Shell scripts from its folder
What it does
Add Capability is an agent skill from fl-sean03/OpenSDL. Add a typed OpenSDL capability contract and propagate it through adapters, schemas, and tests. Use when introducing or changing an executable laboratory operation.
Its SKILL.md is about 290 tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `run.sh`).
It sits in Agent Workflows. The repository describes itself as: A modular Python foundation for reproducible computational and autonomous laboratories. Alpha; the reference profile is simulator-only. The licence is Apache-2.0.
When your agent uses it
- Changing an executable laboratory operation
Example prompts
- “/add-capability”
Requirements
- A Bash shell
Workflow steps
6 steps, taken from the first numbered list in SKILL.md.
- 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
- 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.
What it can do on your machine
Read from SKILL.md and the folder at commit 43f4988. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships script files (Shell), which the agent can run.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Add Capability loads about 286 tokens when it runs. Until then it costs about 45 tokens; SKILL.md has 118 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from fl-sean03/OpenSDL at commit 43f4988, republished under its Apache-2.0 licence (© fl-sean03). 118 words, ~286 tokens.
Download SKILL.mdSave it as
.claude/skills/add-capability/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- add-capability
- description
- Add a typed OpenSDL capability contract and propagate it through adapters, schemas, and tests. Use when introducing or changing an executable laboratory operation.
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.
© fl-sean03, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 1 other file in .agents/skills/add-capability of fl-sean03/OpenSDL.
- SKILL.md
- run.sh
Open the folder on GitHubat commit 43f4988
Compare with similar skills
Add Capability next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Add Capability this skillfl-sean03/OpenSDL | 107 | — | ~286 | Automated safety check: Pass | Apache-2.0 | |
| MCP Server Builderanthropics/skills | 180k | 63 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| Hook Development for Claude Code Pluginsanthropics/claude-plugins-official | 38k | 10 repos | ~4.1k | Automated safety check: Notes | Apache-2.0 | |
| Using Superpowersfarm-fe/farm | 5.6k | 35 repos | ~1.4k | Automated safety check: Pass | MIT | |
| Executing Plans Inlineobra/superpowers | 297k | 2 repos | ~5.1k | Automated safety check: Pass | MIT | |
| Skill CreatorAzure/azqr | 795 | 89 repos | ~8.2k | Automated safety check: Pass | Apache-2.0 |
Similar skills
- Official
- Official
Hook Development for Claude Code Plugins
anthropics/claude-plugins-official
Explains how to write Claude Code plugin hooks, both prompt-based checks and bash commands, for events such as PreToolUse, Stop and SessionStart.
Using Superpowers
farm-fe/farm
A skill your agent uses when starting any conversation - establishes how to find and use skills, requiring Skill tool invocation before ANY response including clarifying questions
Executing Plans Inline
obra/superpowers
Has the agent carry out an implementation plan itself, task by task in the current session, keeping a ledger, proving each step with a test and ending with one whole-branch review.
- Official
Skill Creator
Azure/azqr
Create new skills, modify and improve existing skills, and measure skill performance.
- Official
Claude Code Agent Development
anthropics/claude-plugins-official
Explains how to write agents for Claude Code plugins: the markdown file with YAML frontmatter, trigger descriptions, model and color settings, and system prompt design.
More from fl-sean03/OpenSDL
All 11 skills in this repoAuthor Skill
fl-sean03/OpenSDL
Create, revise, split, or remove an OpenSDL repository skill.
Create Lab
fl-sean03/OpenSDL
Create a simulator-first organization laboratory scaffold with policy and validation.
Debug Run
fl-sean03/OpenSDL
Diagnose a failed OpenSDL run, reproduce it in simulation, and validate the smallest correct fix.
Design Lab
fl-sean03/OpenSDL
Scope the physical and interface design of a laboratory before configuring it.
Develop Workflow
fl-sean03/OpenSDL
Design, change, validate, and test an OpenSDL workflow through a simulation manifest.
Orient Lab
fl-sean03/OpenSDL
Inspect the current OpenSDL repository and declared laboratory state.
Related
Categories
Questions about Add Capability
What does Add Capability do?
Add a typed OpenSDL capability contract and propagate it through adapters, schemas, and tests. Add Capability is an agent skill from fl-sean03/OpenSDL. Add a typed OpenSDL capability contract and propagate it through adapters, schemas, and tests.
When should I use Add Capability?
Add Capability fits situations like: changing an executable laboratory operation.
How do I install Add Capability in Claude Code?
Run `npx skills add fl-sean03/OpenSDL --skill add-capability -a claude-code`. Or copy the skill folder (.agents/skills/add-capability in fl-sean03/OpenSDL) into .claude/skills/add-capability in your project. Claude Code loads it when a task matches its description.
How do I install Add Capability in Codex?
Run `npx skills add fl-sean03/OpenSDL --skill add-capability -a codex`. Or copy the skill folder (.agents/skills/add-capability in fl-sean03/OpenSDL) into .agents/skills/add-capability in your project. Codex loads it when a task matches its description.
Can I use Add Capability in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add fl-sean03/OpenSDL --skill add-capability -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/add-capability, .gemini/skills/add-capability, .github/skills/add-capability and .opencode/skills/add-capability in your project.
What does Add Capability need to run?
Going by SKILL.md and its folder, Add Capability needs a shell for the scripts in its folder. Our summary lists: A Bash shell.
Does Add Capability access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Add Capability safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Add Capability use?
Add Capability is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Add Capability use?
About 286 tokens (SKILL.md is roughly 1.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Add Capability?
Skills that share tags, products or a category with Add Capability: MCP Server Builder (anthropics/skills, 180k stars), Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 38k stars), Using Superpowers (farm-fe/farm, 5.6k stars) and Executing Plans Inline (obra/superpowers, 297k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Add Capability?
fl-sean03 (a GitHub user) maintains it in fl-sean03/OpenSDL, which has 107 GitHub stars. The repository holds 11 skills in this directory. The repository was last updated on October 4, 2026.
Source: fl-sean03/OpenSDL on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.