Fine Structure MCP server

• add_custom_domainFree

  Attach or replace the app custom domain through the same Fine Structure Studio custom-domain flow. Returns exact DNS verification and routing records for the user to configure at their DNS provider.

• add_file_changeFree

  Stage one file upsert or delete inside a change set. Does not modify the live app until apply_change_set. Paths follow the Fine Structure app file API, documented at https://finestructure.ai/api/mcp/docs.

• agency_create_claim_linkwrite actionFree

  Agency mode only. Create a client claim link for an existing app owned by the agent. The client must log in with the invited email before ownership transfers.

• agency_create_clientwrite actionFree

  Agency mode only. Create or update a client record for an account-level agent. This does not create a verified Fine Structure user account and does not transfer ownership.

• agency_create_client_appwrite actionFree

  Agency mode only. Create a new app owned by the agent, start generation, and create a claim link for the client. Ownership transfers only when the invited client logs in with the same email and accepts the claim link.

• agency_get_claim_statusFree

  Agency mode only. Inspect one handoff status without exposing the raw claim token.

• agency_list_clientsFree

  Agency mode only. List client records and app handoff status for the authenticated agent.

• apply_change_setFree

  Apply a staged change set to the app. Creates a Saved Version before applying. Blocks on validation errors unless force=true.

• attach_agent_whatsappFree

  Connect a platform WhatsApp number to one of the account's agents, so the owner can message that number and reach that agent. Requires the owner to be verified first. Take phone_number_id from get_agent_whatsapp. A number already used by another account is still valid to connect: it answers only this owner's verified phone.

• check_domain_verificationFree

  Check Fine Structure custom-domain verification and SSL status for the configured custom domain, then save the latest status.

• check_subdomain_availableFree

  Check whether a platform subdomain can be claimed before calling set_app_subdomain. Returns available plus a status of available, invalid, reserved, taken, current, or empty, with the exact reason. Pass app_id (an app you own) to have that app's own current subdomain reported as 'current' instead of 'taken'.

• compare_current_to_versionFree

  Compare the current app files to a Saved Version and return compact per-file diffs.

• compare_saved_versionsFree

  Compare two Saved Versions and return per-file additions, removals, modifications, and compact diffs.

• configure_domain_redirectsFree

  Configure custom-domain redirect policy: primary domain, optional www/root redirect, and HTTPS enforcement.

• configure_integrationFree

  Store safe non-secret integration metadata for an app. Use set_secret for API keys/tokens.

• confirm_owner_phone_verificationFree

  Confirm the 6-digit code the owner received on WhatsApp from start_owner_phone_verification. On success the owner is verified: agents can message them, and platform numbers become connectable.

• create_ab_testwrite actionFree

  Create a native Fine Structure A/B test between existing app pages. Use update_app first if a variant page still needs to be generated. Creates a Saved Version before the change.

• create_agentwrite actionFree

  Create an autonomous AI agent on the user's Fine Structure account: a standing worker, not a chat session. It gets the platform's default safe tool policy and its own email address, it can read and write the app database, and once the owner phone is verified (see get_agent_whatsapp) it can message its owner on WhatsApp and by email through the platform system channels. Pair it with schedule_agent_task for recurring work such as following up new leads on WhatsApp each morning, watching an app for runtime errors, or sending a weekly summary. Messaging anyone other than the verified owner requires a channel the owner connects in the Fine Structure Studio.

• create_appwrite actionFree

  Create a new application from a natural language prompt. The AI generates a complete web app with pages, components, styling, and data models. Returns a job_id - poll get_job_status to track progress. When the job is done, the app is ready.

• create_change_setwrite actionFree

  Create a staged file change set. Add multiple file changes, validate them as one app state, then apply atomically.

• create_entity_recordswrite actionFree

  Create/insert records in one app entity. Executes directly for the authenticated app owner and returns the created record ids.

• create_entity_schemawrite actionFree

  Create an entity schema file in entities/<Entity>.json. Creates a Saved Version before writing.

• delete_ab_testwrite actionFree

  Delete a native A/B test from an app. Creates a Saved Version before the change.

• delete_entity_recordswrite actionFree

  Delete exact records by ID or exact-match filters. Executes directly for the authenticated app owner; pass expected_count as a safety check to abort on a mismatch.

• delete_secretwrite actionFree

  Delete one app secret by key.

• detach_agent_whatsappFree

  Disconnect the owner's WhatsApp route from a platform number. Removes only this account's route; other accounts sharing the number keep theirs.

• discard_change_setFree

  Discard a pending staged change set without changing app files.

• get_ab_test_statsFree

  Get views, unique visitors, conversions, and conversion rates for an A/B test.

• get_agent_whatsappFree

  Read the WhatsApp state of the connected account: whether the owner's phone is verified, which platform numbers they can connect, and which conversations already route to which agent. Call this first whenever the user asks to talk to an agent on WhatsApp, and repeat its next_step to them.

• get_app_analyticsFree

  Traffic analytics for an app's published site over a chosen window: total views, unique visitors, daily series, top pages, top referrer domains and device split.

• get_app_detailFree

  Deep introspection of an app: entities, pages, settings, integrations, environment variables, and file structure. Use this to understand what an app contains before updating it.

• get_app_filesFree

  Get the file tree for an app with paths and byte sizes.

• get_app_linksFree

  Return editor, preview, published path, subdomain, and custom-domain links plus whether each works for anonymous visitors, app users, or Studio users based on publish and auth settings.

• get_app_security_auditFree

  Read recent server-side security audit events for an app.

• get_app_security_contextFree

  Return safe security context for one owned app: owner id/email, Studio collaborators, generated-app members, route policies, entity policies, and recent security audit entries. Does not return secrets and does not grant access to other apps.

• get_app_statusFree

  Get app overview: files, published state, URL, active jobs.

• get_domain_ssl_statusFree

  Return SSL/certificate status and pending certificate validation DNS records for the app custom domain.

• get_domain_verificationFree

  Return the exact DNS records and instructions required to verify and route the app custom domain.

• get_entitiesFree

  Get all entity (data model) schemas for an app, with record counts. Each entity has fields, types, and relationships.

• get_errorsFree

  Get recent runtime errors for an app (last 20). Useful for diagnosing issues before updating.

• get_job_statusFree

  Poll the status of an async generation job. Use this after create_app or update_app to know when the job is done. Returns status ('running' or 'done'), progress events, and result summary when complete.

• get_pagesFree

  Get all pages in an app with their file paths and sizes.

• get_platform_guideFree

  Return a machine-readable Fine Structure / FSe2 guide for AI agents. Call this at the start of an MCP session to learn app files, entities, safe edit workflows, validation, publishing, A/B testing, secrets, and platform rules.

• get_preview_urlFree

  Return editor preview and published/public URLs for an app.

• get_recommended_workflowFree

  Return the recommended MCP tool sequence for a task type. Use this before creating apps, editing files, seeding data, publishing, setting up A/B tests, restoring versions, or configuring secrets/integrations.

• inspect_previewFree

  Return server-side preview context: URLs, persisted runtime/network errors, static clickable candidates, pages, and explicit live-browser availability.

• invite_app_memberFree

  Provision a generated-app runtime member with a role. This does not create a Studio collaborator, and the owner role cannot be assigned. password is required: ask the account owner which password the member should get. This tool never generates one, because a generated password would come back in the result and that is a live credential in the conversation transcript.

• list_ab_testsFree

  List the platform A/B tests configured for an app.

• list_agent_tasksFree

  List scheduled tasks for one agent (or the whole account), including schedule, status and next_run_at.

• list_agentsFree

  List the AI agents on the user's account with id, name, role, status and FineMail address.

• list_app_domainsFree

  List an app's platform path, subdomain, and configured custom domain with verification, SSL, primary-domain, redirect, publish, and login-gating status.

• list_app_membersFree

  List generated-app runtime users/members for an app. This is separate from Studio project collaborators.

• list_appsFree

  List applications owned by the authenticated user, newest activity first. Returns up to `limit` apps per call plus the total count; page with `offset` when the account has more.

• list_integrationsFree

  List supported integrations and safe connected integration metadata for an app. Tokens/secrets are never returned.

• list_saved_versionsFree

  List restorable Saved Versions for an app, including versions created by MCP writes.

• list_secret_keysFree

  List secret key names for an app. Secret values are never returned.

• patch_app_filewrite actionFree

  Patch one file by replacing exact text. Safer than full overwrite for targeted edits. Creates a Saved Version before changing content. Paths follow the Fine Structure app file API, documented at https://finestructure.ai/api/mcp/docs.

• publish_appwrite actionFree

  Publish an app - freeze current state and make it live at a URL. Also configures whether the public URL is open, app-login gated, private, or inferred from the app.

• query_entityFree

  Query app data records for one entity with optional exact-match filters.

• read_app_fileFree

  Read one source file from an app's virtual filesystem. Paths follow the Fine Structure app file API, documented at https://finestructure.ai/api/mcp/docs.

• read_app_filesFree

  Read several source files from an app's virtual filesystem. Paths follow the Fine Structure app file API, documented at https://finestructure.ai/api/mcp/docs.

• remove_app_memberwrite actionFree

  Remove a generated-app runtime member.

• remove_custom_domainwrite actionFree

  Remove the configured custom domain from the app and clean up the platform-side hostname registration when possible.

• rename_app_fileFree

  Rename or move one app source file atomically. Internally stages an upsert at new_path and a delete at old_path, validates the resulting app state, and creates a Saved Version before applying.

• restore_file_from_versionFree

  Restore one file from a Saved Version instead of restoring the entire app. Creates a Saved Version before changing the file. Paths follow the Fine Structure app file API, documented at https://finestructure.ai/api/mcp/docs.

• schedule_agent_taskwrite actionFree

  Create a scheduled task for one of the user's agents. Supported schedule types: once (run_at ISO local time + timezone), interval (interval_minutes 5-1440), hourly, daily (time HH:MM + timezone), weekly (time + timezone + days_of_week 0=Sunday..6), cron (5-field expression + timezone), manual (only runs on demand). Returns the normalized schedule and the computed next_run_at so you can read the fire time back to the user in their timezone.

• seed_entityFree

  Compatibility tool for starter-record creation. Inserts directly for the authenticated app owner; by default it only seeds an empty entity (skip_if_not_empty).

• set_app_subdomainFree

  Set or clear the app platform subdomain - the '<subdomain>.<base domain>' host Fine Structure already serves the app on. Runs the same ownership, format, reserved-name and uniqueness checks as the Studio subdomain field because it calls the same model function. Replacing a subdomain takes effect immediately and creates NO redirect: the previous name stops resolving to this app and is released for anyone to claim. Pass an empty subdomain to clear it. For a domain the user owns, use add_custom_domain instead.

• set_entity_policywrite actionFree

  Create or update server-side read/write role policy for an app entity.

• set_primary_domainFree

  Set which app host should be treated as primary for generated links and custom-domain redirects.

• set_route_policywrite actionFree

  Create or update a server-owned route policy for a generated app route.

• set_secretwrite actionFree

  Create or update one encrypted app secret. The secret value is never returned.

• start_owner_phone_verificationwrite actionFree

  Send a 6-digit code over WhatsApp to the ACCOUNT OWNER's own phone. This is the one-time ownership proof required before a platform number can be connected, and it also unlocks agents messaging the owner. Ask the user for their own WhatsApp number first and send only to that. No WhatsApp Business account is involved.

• update_ab_testwrite actionFree

  Update a native A/B test, including active state, variants, traffic, and conversion goal. Creates a Saved Version before the change.

• update_appwrite actionFree

  Update an existing application with a new prompt. The AI modifies the app based on your instructions. Creates a Saved Version before the update. Returns a job_id - poll get_job_status to track progress.

• update_app_member_rolewrite actionFree

  Update a generated-app runtime member role. This cannot assign owner and cannot change the Fine Structure account owner.

• update_entity_metadatawrite actionFree

  Set relationship/index metadata on an entity schema. This stores metadata in the schema file; DB index creation is automatic where supported by the platform.

• update_entity_recordwrite actionFree

  Compatibility tool that updates one record by ID. Executes directly for the authenticated app owner.

• update_entity_recordswrite actionFree

  Update exact records. Select explicit record_ids or exact-match filters and provide shared changes, or provide per-record updates. Executes directly for the authenticated app owner; expected_count aborts the write on a mismatch.

• update_entity_schemawrite actionFree

  Replace or shallow-merge an existing entity schema file. Creates a Saved Version before writing.

• validate_appwrite actionFree

  Run deterministic app checks: syntax, imports, routes/pages, entity schemas, missing entities, and recorded runtime errors.

• validate_change_setFree

  Validate current app files plus staged change set files before applying.

• validate_entity_relationshipsFree

  Validate entity relationship metadata and *_id references against existing entity schemas.

• write_app_filewrite actionFree

  Create or replace one file in an app's virtual filesystem. Creates a Saved Version before changing content. Paths and file model follow the Fine Structure app file API, documented at https://finestructure.ai/api/mcp/docs.

• –Code scanremote-only server, no package to scann/a
• Live reliabilityremote reachable in 1435ms20/20
• Tool poisoning84 tool descriptions checked15/15
• Auth qualityopen endpoint exposes 30 write-action tools with no auth3/15
• Maintenanceno repository listed3/15
• Maintainer identityverified namespace with website, no repo4/10

Fine Structure: common questions

Is Fine Structure MCP server safe?

With care: it is graded C, so read the findings first (60/100). Read the Fine Structure safety report

How do I install Fine Structure?

It runs remotely at finestructure.ai. Add it to Claude Code, Claude Desktop or Cursor with the snippets above, or call it through the mcp.market gateway without installing anything.

Does Fine Structure need an API key?

Not as far as the registry entry and our scan can tell: no credentials are declared or required.

Is Fine Structure maintained?

The latest release is v1.0.2.

Is Fine Structure up?

100% of our last 20 checks got an answer. We check remote servers about four times a day.

What can I use instead of Fine Structure?

Servers from other publishers that do the same job: Impreza Host MCP server, smbCloud Mail & Auth MCP server and Mixmax MCP server. Compare all Fine Structure alternatives.