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/fazxes/claude-code/build-mcpbnpx skills add fazxes/Claude-code --skill build-mcpbgit clone --depth 1 https://github.com/fazxes/Claude-codeWrote 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/fazxes/claude-code/build-mcpb)<a href="https://agentmods.dev/skills/fazxes/claude-code/build-mcpb"><img src="https://agentmods.dev/badge/skills/fazxes/claude-code/build-mcpb.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 | $0.00098 | $0.01869 |
| Opus 5 | $0.00049 | $0.00934 |
| Sonnet 5 | $0.00020 | $0.00374 |
| Haiku 4.5 | $0.00010 | $0.00187 |
Grade A, and why
build-mcpb 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 yesterday.
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.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
What ships with it
2 files 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.
- yesterday First seen · 198 lines · 98 tokens per session scan A f3c04fbc9912
build-mcpb is a skill published in the GitHub repository fazxes/Claude-code (234 stars, last pushed 5mo ago), with no licence file. It adds 98 tokens to every session and 1,869 once invoked, about $0.0005 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.
Other skills, from other repositories
chores
Run the standard pre-ship wrap-up for the current work — verify suite, code review, docs sync, then commit and open a PR. Trigger on "/chores", "run chores", "wrap up", "ship it", or when a task is done and should ship.
review
Code-review the current branch's diff for correctness bugs and Swarm-invariant violations. Trigger on "/review", "review my changes", "code review", or before shipping. Reports findings; does not auto-fix.
pr
Open a pull request from the current worktree — verify green, commit scoped, push, and write the PR from the actual diff. Trigger on "/pr", "open a PR", "make a pull request".
design-review
Review dashboard/UI changes for design-system and usability consistency. Trigger on "/design-review", "review the UI", or after editing packages/web. Reports findings; does not auto-fix.
plan
Show the Swarm development plan as clean markdown tables — milestones, what's done, in progress, and next. Trigger on "/plan", "show the plan", "where are we", "what's next", "status", or any request for a progress snapshot.
ensembl-database
Query Ensembl genome database REST API for 250+ species. Gene lookups, sequence retrieval, variant analysis, comparative genomics, orthologs, VEP predictions, for genomic research.