MCP server

Fine Structure Official

ai.finestructure/fine-structure

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Build and host full-stack apps from a prompt, with agents that reach you on WhatsApp and email.

Website

At a glance

Type

MCP server

Publisher

finestructure.ai (verified by the MCP Registry)

Status

Working at last check

Tools

99

Token cost

About 16,875 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http fine-structure https://finestructure.ai/api/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.fine-structure]
url = "https://finestructure.ai/api/mcp"

Gemini CLI

{"mcpServers":{"fine-structure":{"httpUrl":"https://finestructure.ai/api/mcp"}}}

Cursor

{"mcpServers":{"fine-structure":{"url":"https://finestructure.ai/api/mcp"}}}

VS Code

{"servers":{"fine-structure":{"type":"http","url":"https://finestructure.ai/api/mcp"}}}

Antigravity

agy mcp add fine-structure https://finestructure.ai/api/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"fine-structure","server_url":"https://finestructure.ai/api/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"fine-structure","server_url":"https://finestructure.ai/api/mcp"}

Tools

• add_custom_domain ~140 tokens
  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_change ~221 tokens
  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_link ~243 tokens
  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_client ~167 tokens
  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_app ~322 tokens
  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_status ~95 tokens
  Agency mode only. Inspect one handoff status without exposing the raw claim token.
• agency_list_clients ~86 tokens
  Agency mode only. List client records and app handoff status for the authenticated agent.
• apply_change_set ~134 tokens
  Apply a staged change set to the app. Creates a Saved Version before applying. Blocks on validation errors unless force=true.
• attach_agent_whatsapp ~190 tokens
  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 thi
• check_domain_verification ~123 tokens
  Check Fine Structure custom-domain verification and SSL status for the configured custom domain, then save the latest status.
• check_subdomain_available ~189 tokens
  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
• compare_current_to_version ~115 tokens
  Compare the current app files to a Saved Version and return compact per-file diffs.
• compare_saved_versions ~150 tokens
  Compare two Saved Versions and return per-file additions, removals, modifications, and compact diffs.
• configure_domain_redirects ~180 tokens
  Configure custom-domain redirect policy: primary domain, optional www/root redirect, and HTTPS enforcement.
• configure_integration ~161 tokens
  Store safe non-secret integration metadata for an app. Use set_secret for API keys/tokens.
• confirm_owner_phone_verification ~173 tokens
  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_test ~341 tokens
  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_agent ~372 tokens
  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 i
• create_app ~172 tokens
  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_set ~99 tokens
  Create a staged file change set. Add multiple file changes, validate them as one app state, then apply atomically.
• create_entity_records ~192 tokens
  Create/insert records in one app entity. Executes directly for the authenticated app owner and returns the created record ids.
• create_entity_schema ~180 tokens
  Create an entity schema file in entities/<Entity>.json. Creates a Saved Version before writing.
• create_platform_request ~441 tokens
  Open a request to the Fine Structure platform team: a bug, a feature request or a question about the platform itself (not about the user's app). Use it when something in the platform blocks you instead of working around it. Give a reproduction the team can run (invoke_function / curl / the exact too
• delete_ab_test Deletes data · ~90 tokens
  Delete a native A/B test from an app. Creates a Saved Version before the change.
• delete_entity_records Deletes data · ~243 tokens
  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_secret Deletes data · ~74 tokens
  Delete one app secret by key.
• detach_agent_whatsapp ~107 tokens
  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_set ~90 tokens
  Discard a pending staged change set without changing app files.
• get_ab_test_stats ~90 tokens
  Get views, unique visitors, conversions, and conversion rates for an A/B test.
• get_agent_conversation ~194 tokens
  Read visible messages, answers and result links in an owned agent's conversation. Returns the newest page in chronological order. For older history, pass next_before_id as before_id. For new replies, omit before_id.
• get_agent_task ~185 tokens
  Check a durable task returned by send_agent_message or list_agent_tasks. Includes the latest execution status and pending approvals, including before a run starts. Task scheduling state is separate from run outcome. Read the conversation for the actual answer; accepted/queued is not completed. Appro
• get_agent_whatsapp ~137 tokens
  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_analytics ~120 tokens
  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_detail ~98 tokens
  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_files ~63 tokens
  Get the file tree for an app with paths and byte sizes.
• get_app_links ~100 tokens
  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_metadata ~86 tokens
  Read the saved public HTML-shell identity: name, description, language and image URLs/dimensions. Same settings as Studio SEO/GEO.
• get_app_security_audit ~78 tokens
  Read recent server-side security audit events for an app.
• get_app_security_context Changes accounts · ~138 tokens
  Return safe security context for one owned app: owner id/email, Studio collaborators, generated-app members, route policies, entity policies, function policies, and recent security audit entries. Does not return secrets and does not grant access to other apps.
• get_app_status ~65 tokens
  Get app overview: files, published state, URL, active jobs.
• get_domain_ssl_status ~116 tokens
  Return SSL/certificate status and pending certificate validation DNS records for the app custom domain.
• get_domain_verification ~115 tokens
  Return the exact DNS records and instructions required to verify and route the app custom domain.
• get_entities ~81 tokens
  Get all entity (data model) schemas for an app, with record counts. Each entity has fields, types, and relationships.
• get_errors ~99 tokens
  Get recent runtime errors for an app (last 20). Useful for diagnosing issues before updating.
• get_job_status ~116 tokens
  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_pages ~62 tokens
  Get all pages in an app with their file paths and sizes.
• get_platform_guide ~276 tokens
  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_platform_request ~136 tokens
  One platform request with its full history: team replies, status changes (open | triaged | in_progress | needs_info | deployed | wont_fix) and what was deployed (commit, time). Pass since=<ISO timestamp> to get only the events after it.
• get_preview_url ~65 tokens
  Return editor preview and published/public URLs for an app.
• get_recommended_workflow ~262 tokens
  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_preview ~175 tokens
  Return server-side preview context: URLs, persisted runtime/network errors, static clickable candidates, pages, and explicit live-browser availability.
• invite_app_member ~258 tokens
  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 th
• invoke_function ~264 tokens
  Run a backend function of an owned app exactly like the HTTP route and return its status and JSON. caller='owner' runs as the app owner; caller='anonymous' first evaluates the function policy as a public visitor and returns the 401/403 decision without running when access would be denied. Use it to
• list_ab_tests ~62 tokens
  List the platform A/B tests configured for an app.
• list_agent_conversations ~124 tokens
  List recent visible conversations belonging to one of your agents. Use get_agent_conversation to read replies and results.
• list_agent_tasks ~128 tokens
  List scheduled tasks for one agent (or the whole account), including schedule, status and next_run_at.
• list_agents ~72 tokens
  List the AI agents on the user's account with id, name, role, status and FineMail address.
• list_app_domains ~92 tokens
  List an app's platform path, subdomain, and configured custom domain with verification, SSL, primary-domain, redirect, publish, and login-gating status.
• list_app_members ~78 tokens
  List generated-app runtime users/members for an app. This is separate from Studio project collaborators.
• list_apps ~162 tokens
  List owned and accepted Studio-shared applications, newest activity first. Returns up to `limit` apps per call plus the total count; page with `offset` when the account has more. Accepted editors can edit shared source; viewers can read it. Publishing, records, domains and security administration re
• list_integrations ~81 tokens
  List supported integrations and safe connected integration metadata for an app. Tokens/secrets are never returned.
• list_platform_requests ~230 tokens
  Your account's platform requests, newest activity first. Call it at the start of a session with since=<the updated_date you last saw> to learn what changed: replies, needs_info questions to answer, deployments with their commit. Filters: app_id, status.
• list_saved_versions ~73 tokens
  List restorable Saved Versions for an app, including versions created by MCP writes.
• list_secret_keys ~68 tokens
  List secret key names for an app. Secret values are never returned.
• patch_app_file ~211 tokens
  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.
• preview_saved_version ~149 tokens
  Prepare an isolated read-only Saved Version preview, if enabled by the deployment. Returns compiled files for an offline sandbox, never restores files or reads live records. Never execute the returned program with host credentials. Requires app access and versions:read.
• publish_app Sends messages · ~304 tokens
  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_entity ~190 tokens
  Query app data records for one entity with optional exact-match filters.
• read_app_file ~147 tokens
  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_files ~151 tokens
  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_member ~81 tokens
  Remove a generated-app runtime member.
• remove_custom_domain ~118 tokens
  Remove the configured custom domain from the app and clean up the platform-side hostname registration when possible.
• rename_app_file ~214 tokens
  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.
• reply_platform_request Sends messages · ~152 tokens
  Add a reply or a finding to one of your platform requests without opening a new one, e.g. to answer a needs_info question (that reopens it).
• restore_file_from_version ~178 tokens
  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_task ~406 tokens
  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
• seed_entity ~218 tokens
  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).
• send_agent_message Sends messages · ~259 tokens
  Talk to an existing agent or assign it work using its normal tools, memory, permissions and team. Omit conversation_id to start a new owner conversation; supply it to continue one. Returns acceptance and a durable task_id immediately, NOT a completed answer. Poll get_agent_task and read get_agent_co
• set_agent_owner_relay Sends messages · Changes accounts · ~155 tokens
  Set the owner's consent for one owned agent to relay reports from another owned agent (or all sources with '*'). Uses the same preference as the agent screen. Does not send a message or grant access to customer conversations.
• set_app_metadata ~367 tokens
  Update public HTML-shell metadata immediately, without AI, code edits, publishing or Saved Versions. Upload social_image/icon as base64 PNG/JPEG/WebP (max 5 MB, 4096px); null clears an image. Language sets HTML lang/dir and OG locale. For per-page cards, write optional seo.json and publish it; dynam
• set_app_subdomain ~260 tokens
  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 imm
• set_entity_policy ~439 tokens
  Replace server-side entity access policy. Optional action rules override read/write roles and can allow public create without public read, update, or delete. Omitting rules replaces any existing action rules with read/write role behavior.
• set_function_policy ~669 tokens
  Create or update the server-owned access policy of a backend function (functions/<name>.js). Without a policy a function answers only to the app owner's Studio token (401 for app visitors and webhooks). Recipes: anonymous checkout step or inbound webhook/IPN -> require_auth=false; signed-in members
• set_primary_domain ~115 tokens
  Set which app host should be treated as primary for generated links and custom-domain redirects.
• set_route_policy ~158 tokens
  Create or update a server-owned route policy for a generated app route.
• set_secret ~111 tokens
  Create or update one encrypted app secret. The secret value is never returned.
• start_owner_phone_verification ~199 tokens
  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 ac
• update_ab_test ~246 tokens
  Update a native A/B test, including active state, variants, traffic, and conversion goal. Creates a Saved Version before the change.
• update_app ~130 tokens
  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_role ~122 tokens
  Update a generated-app runtime member role. This cannot assign owner and cannot change the Fine Structure account owner.
• update_entity_metadata ~165 tokens
  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_record ~164 tokens
  Compatibility tool that updates one record by ID. Executes directly for the authenticated app owner.
• update_entity_records ~353 tokens
  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_schema ~182 tokens
  Replace or shallow-merge an existing entity schema file. Creates a Saved Version before writing.
• update_platform_request ~163 tokens
  Platform team only: set the status of a request (open | triaged | in_progress | needs_info | deployed | wont_fix), attach the deployed commit and/or reply. deployed and needs_info mail the requester.
• validate_app ~99 tokens
  Run deterministic app checks: syntax, imports, routes/pages, entity schemas, missing entities, and recorded runtime errors.
• validate_change_set ~110 tokens
  Validate current app files plus staged change set files before applying.
• validate_entity_relationships ~78 tokens
  Validate entity relationship metadata and *_id references against existing entity schemas.
• write_app_file ~173 tokens
  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.

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