Errors & limits

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How errors are returned

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HTTP and protocol errors

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Tool errors

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "content": [{ "type": "text", "text": "Tool invocation failed." }],
    "isError": true
  }
}

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Messages from the provider

• Expired or rejected access: when a connection has expired or the provider rejects the stored access, the result usually says that the connector must be reconnected, for example Search Console rejected the access token (401); reconnect required. This applies to every connector except CVR, which has no connection of its own. Reconnect the connector in the portal.
• e-conomic: a rate limit returns a message to wait and ask for fewer or smaller pages. Temporary unavailability returns a message to try again shortly; after a write, check in e-conomic whether it was applied before you repeat it. When e-conomic rejects a request as invalid (HTTP 400, 404 or 422, and 409 on the journal tools), the result summarizes what e-conomic rejected, such as the field, so the model can correct the call. See the e-conomic reference.
• Uniconta, on the four daily-journal write tools: when Uniconta refuses a write (for example missing rights or an unknown account), the result is Uniconta refused <METHOD> <path>: <reason>. Nothing was changed. The connector’s own checks (unknown or blocked journal, a line that is not unposted, a posting preview that no longer matches) also return a message. See the Uniconta reference.
• Ordrestyring: a rate limit that persists, and validation errors that name the field. See the Ordrestyring reference.
• Business Central (early access): missing permissions (403), an unknown environment, a wrong company id (404), a rejected query (400) and a rate limit that persists. See the Business Central reference.

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Rate limits

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Provider limits

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Timeouts

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Request limits

• Request size: a request body may be at most 256 KiB. A larger body gets HTTP 400 with Parse error.
• Headers: send Content-Type: application/json and Accept: application/json, text/event-stream on every POST.
• Sessions: the endpoints are stateless. The server issues no Mcp-Session-Id, so every request carries its own bearer token. A POST may be answered as a Server-Sent Events stream.
• Browser calls: the MCP endpoints send no CORS headers and refuse a foreign Origin with 403. Call them from a server-side process or a native MCP client.
• Long-running calls: while a tool call is still running on an SSE response stream, the server sends an SSE comment line (: keepalive) about every 25 seconds to keep the connection alive. Clients should ignore it.

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Row limits per connector

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Google Search Console

• Rows per request: up to 25,000 (limit on top_queries and top_pages, rowLimit on search_analytics_query).
• Pagination: use startRow in search_analytics_query to fetch further rows.
• Dates: always YYYY-MM-DD.
• Properties: you can only reach properties that the authorized Google account already has access to. Use list_sites to see them.

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CVR

• size is 1–50 on soeg_virksomhed, find_produktionsenheder and find_virksomheder_for_person (default 10, or 50 for find_produktionsenheder). Values outside the range are rejected, not reduced, and there is no paging beyond the first 50 rows. find_ejere has no size and returns all relations.

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Uniconta

• Rows per call: limit defaults to 50, max 1000.
• Paging: list_inventory_items, list_inventory_transactions, list_journal_lines and query take offset; follow nextOffset in the result.
• Aggregation: aggregate covers at most about 50,000 rows per call and returns truncated: true beyond that; narrow the filters or the date range. A grouping that produces more than 1,000 groups fails the call.
• Journal batches: create_journal_lines, update_journal_lines and post_journal_lines take at most 50 lines per call; delete_journal_line deletes one line.
• Write refusals: a write Uniconta refuses returns Uniconta refused <METHOD> <path>: <reason>. Nothing was changed.
• Confirming: the confirming call of update_journal_lines applies your changes to the lines as they are at that moment. post_journal_lines refuses to post if a line changed after the preview.

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e-conomic

• Page size: list tools take pagesize (default 20, max 1000) and skippages. Not every list tool accepts filter or sort.
• Journal batches: create_journal_entries, update_journal_entries and book_journal_entries take at most 50 entries per call.
• Journal filters: list_journal_entries cannot filter on text or amount.
• Confirming: the confirming call of update_journal_entries applies your changes to the entries as they are at that moment. book_journal_entries refuses to book if an entry changed after the preview.

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Dinero

• Rate limit: Dinero allows about 100 requests per minute per organization. A call Dinero keeps refusing returns Tool invocation failed..
• Dinero Pro: the public API only works for organizations on Dinero Pro. A non-Pro organization gets 403 from Dinero on every call except list_organizations and validate_connection, and the call returns Tool invocation failed.. Use list_organizations to check isPro.

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Billy

• Page size: list tools take page and pageSize (default 50, 200 for list_currencies, max 1000).

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Ordrestyring

• Page size: list_cases returns up to 200 rows per page (limit, default 50). list_case_hours and list_case_sales_invoices collect up to maxRows rows (default 500, max 2,000).
• find_cases scans at most the 1,000 most recently updated cases.
• Result size: graphql_query results over 100,000 characters, and introspect_schema or describe_type results over 40,000 characters, are refused with Tool invocation failed..

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Meta Ads

• Rows per call: limit 1–5000 (default 100). A large limit can return fewer rows than requested. Use query with params.after to page further.
• Budgets and bids on the write tools are in minor units of the account currency (5000 = 50.00).

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LinkedIn Ads

• Rows per call: list tools return up to limit rows (default 100, max 1000).
• Analytics: get_ad_analytics and get_ad_statistics return one response without paging. LinkedIn caps it at 15,000 rows and accepts at most 20 metric fields.
• Money: amounts are decimal strings in major units ("500.00"). currencyCode is required with any amount and must match the ad account’s currency.
• 22 tools (Company Page, organic posts, comments and reactions, member profile) are not available yet; calls to them fail with Tool invocation failed.. They are listed under Write tools & guardrails.

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HubSpot CMS and HubSpot Marketing Email

• Page size: list tools take limit (default 20, max 100) and the after cursor from paging.next.after.
• Analytics (HubSpot CMS): get_traffic_analytics takes dates as YYYYMMDD and limit up to 1000.

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Shopify

• Rows per list call: limit defaults to 50, max 250. There is no cursor argument; narrow the result with query where the tool takes one.
• graphql_query: one read-only query per call, at most 64 KiB (65,536 characters) and 20,000 tokens.

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Business Central

• Page size: default 50, max 500 rows.
• Result size: query_entity results over 100,000 characters and list_entity_metadata results over 40,000 characters are refused with Tool invocation failed..

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Data freshness (Google Search Console)

• Expect a delay of a couple of days on the newest numbers.
• In search_analytics_query you can control this with dataState:
  • final: only fully collected data.
  • all: includes preliminary (fresh but unstable) data.