Appsmith

Appsmith provides a drag-and-drop low-code builder with JavaScript support for writing custom widget logic, REST/GraphQL/SQL datasource connectors, and an API for managing apps and users programmatically. For agents, the REST API enables: creating/listing applications, managing users and permissions, and triggering workflow automations built in Appsmith. JavaScript in the builder allows complex logic without a dedicated backend, which differentiates it from simpler no-code tools. Widely adopted (30k+ GitHub stars) with an active community. Confidence is docs-derived.

Cookie-based session auth for browser flows; API token authentication via Authorization: Bearer for programmatic access. Tokens created via Appsmith user profile. RBAC with workspace-level and app-level roles (Admin, Developer, Viewer). Appsmith Cloud manages SSO integrations; self-hosted supports SAML/LDAP configuration. HTTPS enforced on Cloud; self-hosted requires TLS setup.

docs.appsmith.com provides comprehensive coverage: builder guide, widget reference, datasource connectors (REST, PostgreSQL, MySQL, MongoDB, Firestore, etc.), JavaScript editor, self-hosting (Docker, Kubernetes, AWS), and the REST API reference. Documentation quality is high and well-maintained. Getting started is fast via Appsmith Cloud or Docker. Active GitHub community and Discord.

REST API accessible at <host>/api/v1. Resources: applications, pages, datasources, users, actions (API queries), workspaces. GET /api/v1/applications lists all apps. POST /api/v1/datasources creates a new data source. GET /api/v1/actions/{id} retrieves a saved API query. Response payloads are JSON with resource objects and metadata. Pagination supported on list endpoints. Webhooks available for triggering app workflows from external systems.

Standard HTTP status codes with JSON error bodies including responseMeta.error.code and responseMeta.error.message. 401 for unauthorized, 400 for validation errors, 404 for missing resources. Datasource connection errors surface with the underlying database/API error. Rate limits not prominently documented. Appsmith Cloud uptime at status.appsmith.com. Self-hosted reliability depends on deployment infrastructure.