agent-app-modify

agent-app-modify is a skill for Claude Code, Codex from CraftOS-dev/CraftBot. It costs 37 tokens per session (1,697 once invoked), scanned B, original, MIT.

A workflow for changing an existing Agent App, a local web application built with a PocketBase data service and React user interface. It covers adding features, changing the interface, fixing faults, checking the result, and relaunching the app.

In plain words
What is it for?
Use it to extend an existing app, update its design, diagnose frontend or data-service problems, and verify the updated app.
Why use it?
It keeps requested changes documented and checks the app's files and logs before editing. This helps avoid losing existing requirements or overlooking errors.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to extend an existing app, update its design, diagnose frontend or data-service problems, and verify the updated app.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/craftos-dev/craftbot/agent-app-modify
Install

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.

Any agent
npx skills add CraftOS-dev/CraftBot --skill agent-app-modify
Clone the repo
git clone --depth 1 https://github.com/CraftOS-dev/CraftBot

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for agent-app-modify

README.md
[![agentmods](https://agentmods.dev/badge/skills/craftos-dev/craftbot/agent-app-modify/github.svg)](https://agentmods.dev/skills/craftos-dev/craftbot/agent-app-modify)
Your own site
<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.

agentmods 80×15 button for agent-app-modify

Your own site · 80×15
<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>
Per session 37 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,697 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce 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

Measured 23d ago against content hash 0df6515be2f7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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,
skills/agent-app-modify/SKILL.md · 130 lines

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

  1. Find the project: read agent_file_system/workspace/agent_app_projects.json or use the project id/path given in your instruction.
  2. Read the project's AGENT_APP.md (current plan/entities/ops) and reference/requirements.md. Read manifest.json for authMode and port.
  3. If something broke, read the logs FIRST: {project_path}/logs/frontend_console.log and {project_path}/logs/pocketbase.log.
  4. If the request is ambiguous, ask 1 batch of clarifying questions (a FINAL send_message (continue_work=false — the reply wakes the session)).
  5. Record the request in the spec BEFORE editing code: append a dated entry to reference/requirements.md under a ## Changes section (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; ## Changes is 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 ## Changes entry (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.

Read the full file on GitHub · 130 lines

Changes

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.

  1. 23d ago First seen · 130 lines · 37 tokens per session scan B 0df6515be2f7

Subscribe to this mod's changes

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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