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 skills add lukacf/meerkat --skill builtin-utilities-workflowgit clone --depth 1 https://github.com/lukacf/meerkatWrote 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/lukacf/meerkat/builtin-utilities-workflow)<a href="https://agentmods.dev/skills/lukacf/meerkat/builtin-utilities-workflow"><img src="https://agentmods.dev/badge/skills/lukacf/meerkat/builtin-utilities-workflow/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/lukacf/meerkat/builtin-utilities-workflow"><img src="https://agentmods.dev/badge/skills/lukacf/meerkat/builtin-utilities-workflow.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00020 | $0.00384 |
| Opus 5 | $0.00010 | $0.00192 |
| Sonnet 5 | $0.00004 | $0.00077 |
| Haiku 4.5 | $0.00002 | $0.00038 |
Grade A, and why
builtin-utilities-workflow 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 9d 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
Builtin Utilities Workflow
Use builtin utility tools for local, concrete actions that support the current turn. They are not a durable planning system by themselves.
Operating Rules
- Use
datetimewhen relative dates, local time, deadlines, or schedule inputs need grounding. - Use
apply_patchfor intentional source edits and keep patches scoped. - Use
view_imagewhen the user references a local image or when visual verification matters. - Use
generate_imageonly when the runtime exposes image generation and the task genuinely asks for new or edited imagery. - Use
blob_load_fileto import a project file into the realm blob store,blob_save_fileto write a blob into the project, andblob_inspectto read blob metadata/content. Do not use blob tools as a replacement for normal text inspection. - Use
tool_catalog_searchandtool_catalog_loadwhen deferred tool entries exist and the current visible tool list is not enough. Search reads the catalog; load requests visibility at the next admitted tool boundary and can be refused by session filters or missing scope authority.
Boundaries
- Builtin task tools are private/local task tracking; WorkGraph is the shared durable commitment graph.
- Shell has separate operational safety guidance in
shell-patterns. - Some utility tools are model, store, profile, or runtime conditional. If a tool is not visible, do not assume the underlying capability exists.
- Read-only tool policy admits only tools explicitly classified read-only. Shell, patching, image generation, blob writes, and undeclared tools remain unavailable under that policy.
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.
- 9d ago First seen · 40 lines · 20 tokens per session scan A 0c65f150d843
builtin-utilities-workflow is a skill published in the GitHub repository lukacf/meerkat (20 stars, last pushed today), licensed Apache-2.0. It adds 20 tokens to every session and 384 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 2026-08-30.
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