setup_store_config

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

With no annotations, the description carries full behavioral burden. It does disclose the mutation targets (fastlane files, eas.json submit section, app.json for AdMob), which is meaningful. It does not state whether existing settings are overwritten, what credentials/auth are required, or whether changes are reversible.

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

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

Two sentences, front-loaded with the core purpose and followed by the concrete side effects. No filler or redundancy.

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

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

For a multi-file mutation tool with no annotations and no output schema, the description covers what gets written but omits prerequisites (account credentials, existing EAS project), overwrite semantics, and any indication of what is returned on success or failure. Adequate but with clear gaps.

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

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

Schema description coverage is 100%, so the schema already documents all four parameters in detail. The description only adds that AdMob configuration is optional, which is already implied by the schema's conditional wording. Baseline 3 applies.

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

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

The description names a specific verb (configures) and resource (App Store and Google Play submission settings) and enumerates the concrete artifacts it produces (fastlane Appfile/Fastfile, eas.json submit section). This clearly separates it from siblings like scaffold_app, though it never explicitly names them.

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

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

"For an existing Expo project" implies a prerequisite (the project must already exist / be scaffolded), which is useful context. However, there is no explicit when-to-use vs when-not guidance and no mention of alternatives such as scaffold_app for new projects.

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