chatgpt-app-submission

ChatGPT App Submission

Use this skill when a developer needs a chatgpt-app-submission.json file for a ChatGPT Apps submission. The file is uploaded in the Apps submission form to fill out parts of App Info, MCP Server, and Testing.

Workflow

Inspect the MCP server codebase from the current working directory.
Read repo metadata, package metadata, README files, app manifests, tool descriptors, resource templates, and widget metadata needed to understand the app.
Find every exposed MCP tool, its declared readOnlyHint, openWorldHint, and destructiveHint annotations, and whether it declares outputSchema.
Read each tool implementation and any called helper functions needed to understand side effects.
Compare tool annotations, tool names, tool descriptions, and CSP values against actual behavior. If any value is missing, stale, misleading, or inconsistent, ask the developer for approval before updating source.
Generate concise review-facing app info suggestions, tool hint justifications, positive test cases, and negative test cases.
Write chatgpt-app-submission.json in the current working directory.
Print review-check findings and any missing outputSchema warnings in the final response, and explain what the developer should do with each finding before submission.

Do not infer behavior from the tool name alone. Use the real tool implementation and declared annotations. If a tool calls into another module or API client, inspect enough of that path to know whether it reads, writes, deletes, sends, publishes, or changes external state.

App Info Rules

Suggest app info from source-of-truth project metadata and the tool behavior you inspected. Keep it plain-language and submission-review-facing.

display_name: use the product or app name from repo metadata, package metadata, README, manifest, or existing configuration. Keep it short enough for the submission form.
subtitle: summarize what the app does in one short functional phrase, not marketing copy. It must be 30 characters or less.
description: describe concrete user value and the main workflows the tools support.
category: choose one of BUSINESS, COLLABORATION, DESIGN, DEVELOPER_TOOLS, EDUCATION, ENTERTAINMENT, FINANCE, FOOD, LIFESTYLE, NEWS, PRODUCTIVITY, SHOPPING, or TRAVEL.

Hint Rules

Use the Apps SDK review meanings:

readOnlyHint: true only when the tool strictly fetches, looks up, lists, retrieves, or computes data without changing state. false if it can create, update, delete, send, enqueue, run jobs, write logs, start workflows, or otherwise mutate state.
destructiveHint: true if the tool can delete, overwrite, send irreversible messages or transactions, revoke access, or perform destructive admin actions, including via some modes or parameters. Otherwise false.
openWorldHint: true if the tool can change publicly visible internet state or external third-party systems, such as sending emails or messages, posting/publishing content, creating public tickets/issues, pushing code/content, or submitting external forms. false if it only operates in closed/private systems.

ChatGPT Apps submissions require every tool to set all three hints explicitly. Missing or null hints are submission blockers, even if MCP clients may have protocol-level defaults.

If a hint is missing, null, or does not match the actual behavior you found in code, stop before writing the JSON and ask the developer for approval to update the MCP server source. In the approval request, list each affected tool, the missing/current hint value, the behavior you observed, and the recommended explicit hint value. If the developer approves, make the smallest source change that sets the correct hint explicitly, then generate JSON using the updated values. If the developer does not approve or the correct edit location is ambiguous, do not generate misleading JSON; report the mismatch and the blocked update.

Output Schema Warnings

While inspecting exposed MCP tools, record each tool whose descriptor or source definition omits outputSchema or sets it to null. Missing outputSchema is not a blocker for generating chatgpt-app-submission.json, and the submission JSON does not include output schemas.

Do not infer or invent output schemas for this warning. Use the actual MCP tool descriptor or source definition. In the final response, include a concise warning for any missing tools: Add an outputSchema so models can use this tool's results more reliably. See https://modelcontextprotocol.io/specification/draft/server/tools#tool. Include the affected tool names. If every tool declares outputSchema, do not include an outputSchema warning.

Tool Descriptor and CSP Rules

Check tool names, tool descriptions, and widget CSP metadata while inspecting the app.

Tool input schemas should not solicit sensitive data unless that data is strictly necessary for the app's stated user-facing workflow. Flag fields that ask for PHI, PCI, SSNs, credentials, MFA codes, government IDs, biometrics, or similarly sensitive identifiers.
Tool names should match the action the tool performs and should not imply capabilities the implementation does not provide.
Tool descriptions should accurately describe inputs, side effects, and user-visible results.
CSP values should be as narrow as the implementation supports. Flag wildcard domains, unused domains, broad resource/connect domains, and missing domains required by actual widget behavior.

If tool names, descriptions, or CSP values appear missing or inconsistent with actual behavior, prompt the developer for approval before editing source. If the developer declines or the correct edit is ambiguous, keep the generated JSON truthful and report the finding in the final response.

Test Case Rules

Generate exactly five positive test cases and exactly three negative test cases.

Positive test cases must use exact MCP action names in tools_triggered.
Positive prompts should cover the main tool-backed workflows and edge conditions that review should exercise.
Negative test cases should describe prompts where the app should not trigger, including nearby-but-out-of-scope requests.
Keep expected outputs review-facing and concise. Do not include secrets, credentials, source snippets, local paths, request IDs, stack traces, or private implementation details.

Output Contract

Write exactly one JSON file named chatgpt-app-submission.json:

{
  "$schema": "https://developers.openai.com/apps-sdk/schemas/chatgpt-app-submission.v1.json",
  "schema_version": 1,

$schema identifies the import file shape for editors and importers; Codex does not need to fetch it. tools is required. app_info, test_cases, and negative_test_cases are optional in the schema, but generate them whenever the repo contains enough information. Do not include review-check findings in this JSON file.

Writing Justifications

Keep each justification to one sentence.
Be specific about the actual behavior, not the annotation itself.
For write tools, state what system is changed and whether the change is bounded/private or public/external.
For destructive tools, name the irreversible action and mention any real safeguard only if it exists in the code.
Do not include source snippets, secrets, tokens, request IDs, local paths, stack traces, or private implementation details in the JSON.

Good examples:

Only retrieves project metadata and returns it without creating or updating records.
Creates a private task in the user's workspace and cannot publish content to public URLs.
Deletes the selected workspace document, which cannot be recovered after confirmation.

Bad examples:

readOnlyHint is true because the tool is read-only.
Probably safe.
The function calls client.delete_item(...) in src/server.py.

Reporting Review Checks

Report these checks in the final response after writing chatgpt-app-submission.json. Do not write them into the JSON file.

Sensitive data solicitation: flag tool input schema fields that request PHI, PCI, SSNs, credentials, MFA codes, government IDs, biometrics, or similarly sensitive identifiers. Include the tool name and input field in the finding.
Tool data use: flag tools that collect, expose, mutate, or transmit sensitive data in a way the descriptor or tests do not clearly explain.
Tool naming: flag names or descriptions that are too vague, misleading, overbroad, or inconsistent with implementation behavior.
Weak CSPs: flag broad, wildcard, unused, or missing CSP domains in widget metadata.

For each finding, explain the practical next step: update source, update submission copy, narrow CSP, remove or justify a sensitive input, or manually review before submitting. If there are no findings, say that these checks did not find obvious issues from source inspection.

Final Response

After writing the file, summarize the app info fields generated, number of tools covered, positive test case count, and negative test case count. Then include a Review findings section with any sensitive data solicitation, tool data use, tool naming, weak CSP findings, or missing outputSchema warnings and what to do with each one. If generation is blocked, lead with the exact missing hints or source ambiguity.