> For the complete documentation index, see [llms.txt](https://docs.stackai.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.stackai.com/technical-reference/connections-and-tool-execution.md).

# Connections and Tool Execution

Understand how saved credentials, permissions, action schemas, and provider constraints affect tool execution. Provider-specific setup remains in Integrations.

* [Connection Ownership, Sharing, and Permissions](/technical-reference/connections-and-tool-execution/connection-ownership-sharing-and-permissions.md)
* [OAuth Consent, Scopes, and Administrator Approval](/technical-reference/connections-and-tool-execution/oauth-consent-scopes-and-administrator-approval.md)
* [API Keys, Service Accounts, and Certificate Credentials](/technical-reference/connections-and-tool-execution/api-keys-service-accounts-and-certificate-credentials.md)
* [Token Refresh, Expiration, and Reconnection](/technical-reference/connections-and-tool-execution/token-refresh-expiration-and-reconnection.md)
* [Credential Changes and Dependent Workflows](/technical-reference/connections-and-tool-execution/credential-changes-and-dependent-workflows.md)
* [Action Inputs, Outputs, and Validation](/technical-reference/connections-and-tool-execution/action-inputs-outputs-and-validation.md)
* [Pagination and Large Result Sets](/technical-reference/connections-and-tool-execution/pagination-and-large-result-sets.md)
* [Provider Rate Limits, Timeouts, and Retries](/technical-reference/connections-and-tool-execution/provider-rate-limits-timeouts-and-retries.md)
* [Custom Actions: Authentication and Execution](/technical-reference/connections-and-tool-execution/custom-actions-authentication-and-execution.md)
* [Custom MCP Connections and Tool Discovery](/technical-reference/connections-and-tool-execution/custom-mcp-connections-and-tool-discovery.md)


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