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/lorem-dev/skillkeeper-test-repo/text-hook-skillnpx skills add lorem-dev/skillkeeper-test-repo --skill text-hook-skillgit clone --depth 1 https://github.com/lorem-dev/skillkeeper-test-repoWrote 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/lorem-dev/skillkeeper-test-repo/text-hook-skill)<a href="https://agentmods.dev/skills/lorem-dev/skillkeeper-test-repo/text-hook-skill"><img src="https://agentmods.dev/badge/skills/lorem-dev/skillkeeper-test-repo/text-hook-skill.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 | $0.00019 | $0.00446 |
| Opus 5 | $0.00010 | $0.00223 |
| Sonnet 5 | $0.00004 | $0.00089 |
| Haiku 4.5 | $0.00002 | $0.00045 |
Grade A, and why
text-hook-skill 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 4d 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
text-hook-skill
Install this skill for opencode, the one built-in agent whose hook strategy
is delimited-text:
skillkeeper skill install text-hook-skill --agent opencode --allow-hooks
What this fixture covers
- The single-hook layout,
hooks/HOOK.mdwith its payload as a sibling rather thanhooks/<hookName>/HOOK.md. Both layouts resolve;json-hooks-skillcovers the named one. - The
delimited-textstrategy end to end: SkillKeeper wraps the payload in a region with the comment token#, carrying a stabledelimiterId. - Region removal by
delimiterIdon uninstall, which must work even if the surrounding file changed in the meantime. - Append-mode insertion. Install twice into the same file (a second agent, or a reinstall) and check the region is replaced, not duplicated.
- Encapsulation.
region.txtdeliberately contains text that looks like a SkillKeeper delimiter; install must neutralize it so it cannot be mistaken for a region boundary, and reverse that on read. - No
GUIDE.mdand noRULES.md, so this skill writes to the config file without touching the guidance file at all.
A caveat worth knowing
opencode's delimited-text target is opencode.json, and the comment token is
#. JSON has no comment syntax, so a region inserted there makes the file
invalid JSON. That is a property of SkillKeeper's own agent mapping, not of this
fixture.
The practical consequence: opencode's MCP writer parses opencode.json as
JSON, so do not install this hook and an opencode MCP preset into the same
project at the same time - test them separately, or expect the second operation
to fail on a parse error.
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.
- 4d ago First seen · 47 lines · 19 tokens per session scan A 848adeae8ff3
text-hook-skill is a skill published in the GitHub repository lorem-dev/skillkeeper-test-repo (2 stars, last pushed 10d ago), licensed MIT. It adds 19 tokens to every session and 446 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.
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