Update a note: edit its content, move it to a different folder (set container_id, or null for the inbox), archive/favorite it, or change its tags. This is the tool for moving notes between folders; there is no separate move tool. Required: id (integer). Optional content (exactly one body-mutation mode at a time): title, body (full replace), append_body (appends to existing body), insert_after + insert_body (insert text immediately after a unique anchor snippet from the existing body), insert_before + insert_body (insert before a unique anchor), replace_find (+ optional replace_with) (replace a unique snippet; omit replace_with entirely to delete the snippet). Markdown-structure ops (heading/section/checklist aware — safer than eyeballing a unique snippet on long notes): replace_section + section_body (replace everything UNDER a heading, keeping the heading line); append_to_section + section_body (add content at the END of a section — the safe 'insert under heading' when you don't know its last line); rename_heading + new_heading (rename a heading in place, preserving its level unless new_heading carries its own '#'); check_item / uncheck_item (tick/untick a checklist item by its text, e.g. '- [ ] ship it'). Headings and checklist items must each match exactly one line. Anchor and find snippets must match exactly once; include enough surrounding context to disambiguate. Also optional: summary, source_url. Freshness: verified (boolean — pass true to mark the note re-confirmed as still true right now; only send this after the user has actually confirmed it), review_after (ISO 8601 datetime to time-box the note, or null to clear it). Organization: container_id (move note), archived (boolean — works on your own personal notes and on team notes where you have the editor role; notes in shared containers are owner-only), favorited (boolean). Tags: tag_list (full replace, comma-separated), add_tags, remove_tags. tag_list takes precedence over add_tags/remove_tags. Concurrent edit safety: pass expected_lock_version (the lock_version you saw when you last read the note via notes-get / notes-list / search) whenever you want a stale-write guard. If it doesn't match the current version, the update is rejected with the current state included so you can re-read and re-apply. Surgical edits (append_body / insert_after / insert_before / replace_find) are anchor-based and so don't *need* expected_lock_version for their body change — but if you also change title / summary / container_id alongside, those fields can still silently overwrite a newer save unless you supply expected_lock_version. Examples: insert under a heading {id: 42, append_to_section: 'Open Questions', section_body: '- Should we ship Friday?'}; replace a section {id: 42, replace_section: '## Status', section_body: 'Shipped 🎉'}; rename a heading {id: 42, rename_heading: 'TODO', new_heading: 'Done'}; tick a checklist item {id: 42, check_item: 'ship it'}; fix a typo {id: 42, replace_find: 'recieved', replace_with: 'received'}; safe full rewrite {id: 42, body: '...', expected_lock_version: 5}. Every edit is recorded as a named, revertable revision attributed to you — use notes-history to see who changed what, and notes-revert to undo a change.