Due to the number of actions that occur in Trello, nested action resources filter out specific action types. For example, changing the name of a checklistItem will trigger a webhook on the board and will POST an action of type updateCheckItem with the old and new name of the checklistItem. However, no nested actions resource will return action types of updateCheckItem: /cards/{id}/actions/, /boards/{id}/actions/. However you can get that specific action instance via GET/actions/{id}/.
We differentiate between the two types of actions as Included or Excluded. Included means that the action type will be returned when make a GET request that includes actions as a nested resource (eg: 1/members/me/actions). Excluded action types only appear in webhook data and are not returned in requests to nested resources.
addAdminToBoard (Deprecated in favor of makeAdminOfBoard)
addAdminToOrganization (Deprecated in favor of makeAdminOfOrganization)
addAttachmentToCard
addChecklistToCard
addLabelToCard
addMemberToBoard
addMemberToCard
addMemberToOrganization
addOrganizationToEnterprise
addToEnterprisePluginWhitelist
addToOrganizationBoard
commentCard
convertToCardFromCheckItem
copyBoard
copyCard
copyChecklist
createLabel
copyCommentCard
createBoard
createBoardInvitation
createBoardPreference
createCard
createList
createOrganization
createOrganizationInvitation
deleteAttachmentFromCard
deleteBoardInvitation
deleteCard
deleteCheckItem
deleteLabel
deleteOrganizationInvitation
disableEnterprisePluginWhitelist
disablePlugin
disablePowerUp
emailCard
enableEnterprisePluginWhitelist
enablePlugin
enablePowerUp
makeAdminOfBoard
makeAdminOfOrganization
makeNormalMemberOfBoard
makeNormalMemberOfOrganization
makeObserverOfBoard
memberJoinedTrello
moveCardFromBoard
moveCardToBoard
moveListFromBoard
moveListToBoard
removeAdminFromBoard (Deprecated in favor of makeNormalMemberOfBoard)
removeAdminFromOrganization (Deprecated in favor of - makeNormalMemberOfOrganization)
removeChecklistFromCard
removeFromEnterprisePluginWhitelist
removeFromOrganizationBoard
removeLabelFromCard
removeMemberFromBoard
removeMemberFromCard
removeMemberFromOrganization
removeOrganizationFromEnterprise
unconfirmedBoardInvitation
unconfirmedOrganizationInvitation
updateBoard
updateCard
updateCheckItem
updateCheckItemStateOnCard
updateChecklist
updateLabel
updateList
updateMember
updateOrganization
voteOnCard
Excluded Action Types
addAdminToBoard (Deprecated in favor of makeAdminOfBoard)
addAdminToOrganization (Deprecated in favor of makeAdminOfOrganization)
addLabelToCard
copyChecklist
createBoardInvitation
createBoardPreference
createCheckItem
createLabel
createOrganizationInvitation
deleteAttachmentFromCard (Excluded from /lists/{listId}/actions)
deleteCheckItem
deleteComment
deleteLabel
makeAdminOfOrganization
removeAdminFromBoard (Deprecated in favor of makeNormalMemberOfBoard)
removeAdminFromOrganization (Deprecated in favor of makeNormalMemberOfOrganization)