Borrowing it
Nothing to install: this file belongs to BlocUnited-LLC/mozaiks. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/BlocUnited-LLC/mozaiks/main/.agents/skills/add-capability/SKILL.mdgit clone --depth 1 https://github.com/BlocUnited-LLC/mozaiksWrote 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/blocunited-llc/mozaiks/add-capability)<a href="https://agentmods.dev/skills/blocunited-llc/mozaiks/add-capability"><img src="https://agentmods.dev/badge/skills/blocunited-llc/mozaiks/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.
<a href="https://agentmods.dev/skills/blocunited-llc/mozaiks/add-capability"><img src="https://agentmods.dev/badge/skills/blocunited-llc/mozaiks/add-capability.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Agent Snooping · line 14 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
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 | $0.00016 | $0.00143 |
| Opus 5.5 | $0.00006 | $0.00057 |
| Sonnet 5.5 | $0.00003 | $0.00029 |
| Haiku 4.5 | $0.00002 | $0.00014 |
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.
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
The add-capability pattern (FastAPI router + Pydantic models under platform/capabilities/) is
no longer the canonical way to add backend logic to a Mozaiks app.
Use the add-module skill instead. Modules are the canonical deterministic backend unit in
Mozaiks. They follow the 4-layer contract (handler → service → repo → policy + schemas) and are
auto-discovered by the platform host at startup.
See: .agents/skills/add-module/SKILL.md
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.
- 2mo ago First seen · 16 lines · 16 tokens per session scan A 35f1462eb440
add-capability is a skill published in the GitHub repository BlocUnited-LLC/mozaiks (24 stars, last pushed yesterday), licensed MIT. It adds 16 tokens to every session and 143 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.
add-capability compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| add-capabilityBlocUnited-LLC/mozaiks | Skill | 24 | yesterday | MIT | A | 16 | Claude Code |
| agentfieldAgent-Field/agentfield | Skill | 2.6k | yesterday | Apache-2.0 | A | 127 | Claude Code, Codex |
| building-pydantic-ai-agentspydantic/pydantic-ai | Skill | 21k | yesterday | MIT | A | 92 | Claude Code, Codex |
| pydantic-ai-harnesspydantic/pydantic-ai | Skill | 21k | yesterday | MIT | A | 197 | Claude Code, Codex |
| migrating-langchain-to-pydantic-aipydantic/pydantic-ai | Skill | 21k | yesterday | MIT | A | 100 | Codex |
| migrating-vercel-ai-sdk-and-eve-to-pydantic-aipydantic/pydantic-ai | Skill | 21k | yesterday | MIT | A | 107 | Codex |
| migrating-claude-agent-sdk-to-pydantic-aipydantic/pydantic-ai | Skill | 21k | yesterday | MIT | A | 90 | Codex |