extension-data-viewer
Admin-only paginated viewer for stable canister state. Use whenever the user asks for a viewer, dashboard, debug panel, or admin browse over backend data — users, items, orders, logs, or any stable Map/Set/Array/VarArray/List/Stack/Queue. Pre-installed in every Caffeine app via the caffeineai-data-viewer mops package; this skill explains what it does and how to keep using it correctly.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/caffeinelabs/skills --skill extension-data-viewer- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads extension-data-viewer automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
Security audits
Independent scans of the skill's instructions and bundled files.
SKILL.md
The instructions your agent reads when the skill is triggered.
Data Viewer
Admin-only data inspection extension for Caffeine AI.
Overview
Every Caffeine app ships with the caffeineai-data-viewer mops package and the moc --generate-view-queries flag enabled. Together with include MixinViews() in the actor, the compiler auto-exposes a controller-only __<var> query for every stable variable of a supported type:
Map.Map<K, V>—(?K, ?Nat) -> [(K, V)]Set.Set<K>—(?K, ?Nat) -> [K][V],[var V],List.List<V>,Stack.Stack<V>,Queue.Queue<V>—(?Nat, ?Nat) -> [V]
A null cursor starts at the beginning; a null count returns everything from the cursor. Each generated query traps on any non-controller caller — they exist for admin dashboards and debug viewers, not user-facing endpoints.
Backend
The package and include are already wired into the template. You don't need to add or edit anything for the viewer to work — declare a stable variable of a supported type and the __<var> query appears automatically.
import Map "mo:core/Map";
import Principal "mo:core/Principal";
import MixinViews "mo:caffeineai-data-viewer/MixinViews";
actor {
include MixinViews();
let users = Map.empty<Principal, Text>();
// Generated automatically: __users : (ko : ?Principal, count : ?Nat) -> [(Principal, Text)] query
};
Lintoko rule include-mixin-views (shipped with the package) errors if the actor body is missing include MixinViews();. Keep the include — removing it disables every auto-generated viewer.
Rules
- NEVER use the generated
__<var>queries as a substitute for user-facing endpoints — they trap for any non-controller caller. Public list/feed/search methods still need to be written normally withpublic query func listX(...). - NEVER declare an actor member whose name starts with
__— it either collides with an auto-generated query or hits a reserved prefix. - Pure (immutable) collections (
pure/Map,pure/Set,pure/List,pure/Queue) are not supported. The viewer is mutable-only by design; pure collection field access is a deprecated pattern in Caffeine projects anyway.
FAQ
What does the extension-data-viewer skill do?
Admin-only paginated viewer for stable canister state. Use whenever the user asks for a viewer, dashboard, debug panel, or admin browse over backend data — users, items, orders, logs, or any stable Map/Set/Array/VarArray/List/Stack/Queue. Pre-installed in every Caffeine app via the caffeineai-data-viewer mops package; this skill explains what it does and how to keep using it correctly.
How do I install extension-data-viewer?
Run npx skills add https://github.com/caffeinelabs/skills --skill extension-data-viewer in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/extension-data-viewer/ (personal) or .claude/skills/extension-data-viewer/ (project).
Which AI agents can use extension-data-viewer?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is extension-data-viewer safe to install?
Security partners have reviewed it: Gen Agent Trust Hub passed; Socket passed; Snyk passed. As with any skill, read the SKILL.md and bundled scripts before installing.
Who maintains extension-data-viewer?
It is published by caffeinelabs in caffeinelabs/skills. It has 9,885 recorded installs.
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