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 agents/planvault/ai-engineering-playbook/scala-backendgit clone --depth 1 https://github.com/PlanVault/ai-engineering-playbookWrote 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/agents/planvault/ai-engineering-playbook/scala-backend)<a href="https://agentmods.dev/agents/planvault/ai-engineering-playbook/scala-backend"><img src="https://agentmods.dev/badge/agents/planvault/ai-engineering-playbook/scala-backend.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 5.1 | $0.00018 | $0.00767 |
| Opus 5 | $0.00009 | $0.00383 |
| Sonnet 5 | $0.00004 | $0.00153 |
| Haiku 4.5 | $0.00002 | $0.00077 |
Grade A, and why
scala-backend 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.
The source is not reproduced here
A licence we could not identify
The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.
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 · 74 lines · 18 tokens per session scan A 284c30f83069
scala-backend is an agent published in the GitHub repository PlanVault/ai-engineering-playbook (4 stars, last pushed 3d ago), with no licence file. It adds 18 tokens to every session and 767 once invoked, about $0.0001 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 2026-08-31.
Other agents, from other repositories
fixer
Applies Codex code-review findings to the code tree: reads the cited issues, makes the minimum targeted fix per finding, runs relevant verification, and reports the structured result. Dispatch when a code-review artifact is ready to act on. Context: A Codex code-review artifact exists with cited findings. user: "Apply…
documenter
Edits one documentation file in-place to reflect code changes — minimal edits, no prose polish, no scope creep. Operates in UPDATE mode (file exists) or CREATE mode (file is new). Dispatched by /hyperclaude:hyper-docs-sync once per affected doc. Context: hyper-docs-sync identified a doc that needs updating after a…
implementer
Executes one planned implementation step end-to-end: reads context, makes the minimum change, runs obvious verification, reports the diff. Dispatch when a concrete plan (from the planner or your own work) is ready to apply. Context: A plan exists and the next task is queued. user: "Run task 3 from the plan."…
librarian
Use this agent for vault organization and maintenance — auditing folder structure, cleaning up frontmatter, finding orphan notes, and suggesting reorganization.
constitutional-validator
Validates specifications, plans, and implementations against the project constitution at .specify/memory/constitution.md.
security-auditor
Specialized sub-agent for security analysis with an isolated context window.