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opointo

by com.opointo
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Build an app from a design

emit_app
Read-onlyIdempotent

Needs a subscription. Turns a design from the Designer into a working Expo app: navigation, providers, tab bar, screens and the components they use. Returns a recipe for the current project: every file with its target path, one install line and ordered steps with a check each. Pass step for one step in full, which does not count against the daily allowance.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
pageNofor step write or review; each page names the next
stepNoa step id from the recipe, or "review" for the screen list
appIdYesthe share code from the Designer's "Send app to agent", e.g. "34ca4babb2"
overrideNoemit even with screens flagged not ready; ask the customer first

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedInput schema / properties / appId / description
      Previous value: -"the share code from the App Designer's \"Send app to agent\", e.g. \"34ca4babb2\""New value: +"the share code from the Designer's \"Send app to agent\", e.g. \"34ca4babb2\""
  2. Changed1 schema field changed
    • changedInput schema / properties / appId / description
      Previous value: -"the share code from the App Builder's \"Send app to agent\", e.g. \"34ca4babb2\""New value: +"the share code from the App Designer's \"Send app to agent\", e.g. \"34ca4babb2\""
  3. Changed4 schema fields changed
    • changedInput schema / properties / appId / description
      Previous value: -"the share code, e.g. \"34ca4babb2\""New value: +"the share code from the App Builder's \"Send app to agent\", e.g. \"34ca4babb2\""
    • changedInput schema / properties / override / description
      Previous value: -"emit even when screens are flagged as not ready. Ask the customer first; the flags exist for a reason."New value: +"emit even with screens flagged not ready; ask the customer first"
    • addedInput schema / properties / page
      Added value: +{
+  "description": "for step write or review; each page names the next",
+  "type": "number"
+}
    • addedInput schema / properties / step
      Added value: +{
+  "description": "a step id from the recipe, or \"review\" for the screen list",
+  "type": "string"
+}
  4. First observed

TDQS

A3.9/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnly/idempotent/non-destructive, and the description adds real value on top: a subscription gate, a daily-allowance quota, and the exemption for single-step calls. That quota/auth context is exactly what annotations cannot convey. It stops short of describing failure modes or what happens when screens are not ready.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three sentences, front-loaded with the subscription prerequisite, then the transformation, then the return shape and the `step` behavior. Dense but every clause carries information; no filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With no output schema, the description carries the return burden and does so: recipe containing every file with target path, one install line, and ordered steps each with a check. Combined with annotations covering the safety profile and 100% schema coverage, an agent has what it needs to call it correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so baseline is 3, but the description adds meaning to `step` beyond the schema: it yields one step in full and does not count against the daily allowance. The `page`, `appId`, and `override` params are left to their already-detailed schema descriptions.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a concrete verb and resource: turns a Designer design into a working Expo app, enumerating the artifacts produced (navigation, providers, tab bar, screens, components). It is specific enough to distinguish from generic helpers, but it never names a sibling (e.g. propose_app, verify_app) to sharpen the boundary.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides a prerequisite ("Needs a subscription") and usage guidance for the `step` parameter (one step in full, exempt from the daily allowance), which implies when to call it stepwise vs. whole. However it gives no explicit when-not conditions or alternative routing among the many siblings.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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