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 CraftOS-dev/CraftBot --skill agent-app-modifygit clone --depth 1 https://github.com/CraftOS-dev/CraftBotWrote 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/craftos-dev/craftbot/agent-app-modify)<a href="https://agentmods.dev/skills/craftos-dev/craftbot/agent-app-modify"><img src="https://agentmods.dev/badge/skills/craftos-dev/craftbot/agent-app-modify/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/craftos-dev/craftbot/agent-app-modify"><img src="https://agentmods.dev/badge/skills/craftos-dev/craftbot/agent-app-modify.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 | $0.00037 | $0.01697 |
| Opus 5.5 | $0.00015 | $0.00679 |
| Sonnet 5.5 | $0.00007 | $0.00339 |
| Haiku 4.5 | $0.00004 | $0.00170 |
Grade B, and why
agent-app-modify scanned grade B with 1 finding 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 23d 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.
Subtle steeringmediumPrompt injection
Instructions that bias recommendations or shape behaviour without the user noticing.
`status: success` — never tell the user a change is live when the relaunch, How it starts
The opening of the file, as written. The whole thing — 130 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent App Modify
You are changing an EXISTING app. Everything in the agent-app-creator skill applies (ownership rule, schema/verbs/UI order, kit usage, honesty rule) — this skill covers only what differs.
Step 0: Locate and understand
- Find the project: read
agent_file_system/workspace/agent_app_projects.jsonor use the project id/path given in your instruction. - Read the project's
AGENT_APP.md(current plan/entities/ops) andreference/requirements.md. Readmanifest.jsonforauthModeand port. - If something broke, read the logs FIRST:
{project_path}/logs/frontend_console.logand{project_path}/logs/pocketbase.log. - If the request is ambiguous, ask 1 batch of clarifying questions
(a FINAL
send_message(continue_work=false— the reply wakes the session)). - Record the request in the spec BEFORE editing code: append a dated
entry to
reference/requirements.mdunder a## Changessection (create the section if absent):- 2026-08-05: <the user's request, stated as a checkable capability>. NEVER rewrite the existing sections — they are the delivered contract;## Changesis append-only. The verifier checks every entry there, so an unrecorded change is an unverified change (and a recorded one can never be silently dropped by a later modify). SUPERSESSION — the one permitted edit to old entries: when the new request REVERSES or REPLACES an earlier## Changesentry (the user changed their mind, or the old entry demanded an approach the platform now rejects), wrap the stale entry in~~strikethrough~~— do not delete it (it stays as history) and do not leave it live (the verifier enforces every unstruck line, and contradictory live entries make the spec unsatisfiable: an app once went STUCK three times because old entries demanded a handler the validation gate forbids while the new entry forbade it — no code could satisfy both). Strike ONLY entries the new request genuinely contradicts, never entries you merely failed to build.
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.
- 23d ago First seen · 130 lines · 37 tokens per session scan B 0df6515be2f7
agent-app-modify is a skill published in the GitHub repository CraftOS-dev/CraftBot (395 stars, last pushed today), licensed MIT. It adds 37 tokens to every session and 1,697 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it B with 1 finding (subtle steering). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-24.
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