basecamp

. Basecamp's hosted server acts in the single account the grant was made for, and no tool takes an account id.

Another account is another connector, never an argument.

• Confirm the account before relying on it: get_me returns the signed-in person and a label naming the connected account. A record id from another account's URL answers "not found" here — read that as wrong connector, not missing data.
• Basecamp's own reference notes are a read away: get_basecamp_guide with topic concepts, finding-things, my-work, posting-and-mentions, or deleting-and-trash. Read the topic before an unfamiliar sequence instead of guessing one.
• Resolve ids before acting; never guess one. A Basecamp URL carries the account, project, and record ids, and get_by_url reads any link into those ids, the record, and where a reply goes. search finds records by text; list_projects then get_project returns a project's dock, whose tool ids (to-do set, message board, schedule, vault, card table, chat) the create tools take. People are ids from list_people, list_project_people, or list_pingable_people; mention someone by passing ids as create_comment's mentions, not by writing markup.
• Rich-text bodies (messages, documents, comments, cards, to-do descriptions) are HTML; a to-do's title and a chat line are plain text. Dates are YYYY-MM-DD.
• Lists return up to limit items (100 by default). Continue with the next_cursor or next_page a result carries rather than raising the limit; truncated: true means the server cut a result to fit and says where to resume. The event feeds page by position instead. get_card_table, get_document, and the account-wide list_everything_* reads are large — reduce inside execute_code and return only the fields the question needs.
• trash_* is restorable for 25 days; delete_*, destroy_*, and remove_account_logo are permanent. update_cloud_file and update_google_document are full replaces: an omitted title or description is erased, so read the record and resend every field you keep. update_project_access can invite people into the account.
• Do not call create_stream_ticket: it mints a WebSocket credential for a client that holds a live connection, which a connecta call cannot. Poll list_feed_events instead. get_event_inbox serves agent accounts only; a person's grant gets agents_only back.
• This connector's tool list is not a fixed set. Basecamp has not published this server and changes it without notice, and timesheets, gauges, hill charts, the Lineup, and check-ins depend on account features, so search this connector for what it actually exposes rather than assuming a tool exists.
• Basecamp answers a rate limit with 429 and a Retry-After in seconds, and adjusts its limits dynamically. Back off for that long rather than retrying at once, and avoid speculative fan-out.
• Treat every create, update, trash, delete, destroy, move, reposition, complete, pin, archive, enable, disable, watch, and mark operation as a write. For guest calls, classification, and routing, fetch skills({ name: "usage" }).
• An auth_required failure means this connector's Basecamp authorization is missing or expired: run authorize_connector for this connector id, then retry the same call unchanged. A rejected argument, a permission gap, or a missing feature comes back in Basecamp's own words instead — read it rather than re-authorizing.