> ## Documentation Index > Fetch the complete documentation index at: https://80x.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Block reference overview > Attio Workflows has 11 triggers and 33 steps. Each block has its own reference page with inputs, outputs, credit cost, and a worked example. Attio Workflows has 11 triggers and 33 steps. Each block has its own reference page with inputs, outputs, credit cost, and a worked example. Every workflow you build is assembled from these blocks. Each reference page follows the same fixed layout, so once you have read one you can skim the rest. Credit costs follow one rule. Triggers, logic, and lookups are free. Writes and external calls cost 1 credit, and AI is priced by the tokens it uses. The [Credits & pricing explained](/reference/credits-and-pricing) page carries the full table and the per-plan allowances. Every block page links to it rather than repeating it. ## Triggers A trigger is the event that starts a workflow run. Every trigger is free. If you are unsure which one fits your case, read [Choosing the right trigger](/explanation/triggers). Runs when a person clicks Run workflow on selected records. Runs automatically when a new record is created in an object. Runs when an object attribute changes after the record exists. Runs when a person triggers it on selected list entries. Runs automatically when a record joins a list. Runs when a list attribute changes after the entry exists. Runs when an attribute is set or changed, including at creation. Runs automatically when any new task is created. Runs when an external system POSTs to the workflow's URL. Runs when you click Trigger workflow in the editor. Runs on a daily, weekly, monthly, or cron schedule. ## Agents An agent block runs an AI agent against your workspace. Its tool access stays read-only, gated by the "Run as" permission model. That means the agent can read your data but cannot change it. Runs a configured AI agent with read-only tools over your data. Runs an AI agent that researches the public web. ## AI An AI block applies a model to a record or to text. Each one is priced by the tokens it uses, not at a flat rate. Assigns a record to one of your defined categories. Assigns a text input to one of your defined categories. Writes a short summary of a record and its activity. ## Records A record block reads or writes the records in an object. Each write costs 1 credit. Reads are free. Creates a new record in an object. Upserts a record, matching on an attribute you choose. Sets attribute values on an existing record. Looks up records that match a filter, with no credit cost. ## Lists A list block reads or writes list entries. List entries are not the same as records. See [Records vs list entries](/explanation/records-vs-list-entries) for the distinction. Adds a record to a list as a new entry. Sets list-specific attribute values on an entry. Removes an entry from a list without deleting the record. Looks up list entries that match a filter, with no credit cost. ## Sequences A sequence is an automated series of outreach emails. A sequence block adds a person to an Attio sequence or takes them out of one. Adds a person to an email sequence. Removes a person from a sequence they are enrolled in. ## Tasks A task block creates a task or marks one complete. Creates a task linked to a record, with an assignee and due date. Marks an existing task as done. ## Calculations A calculation block transforms data inside a run. Most of these are free logic blocks. To reference their outputs in later steps, see the [Variables and expressions reference](/reference/variable-syntax). Runs a sandboxed code snippet; cost is variable (complexity-based). Shifts a date or time by an offset you specify. Reduces a list of values to a sum, count, or other total. Computes a value from an expression over your inputs. Returns a random number within a range you set. ## Conditions A condition block decides which branch a run takes. All condition blocks are free. Stops the run unless the record matches your criteria. Splits the run into a true branch and a false branch. Routes the run down one of several labelled branches. ## Delays A delay block pauses a run. It can wait for a fixed duration or hold until a set moment. Both are free. Pauses the run for a fixed duration. Pauses the run until a specific date or time. ## Workspace A workspace block acts on your team rather than on a single record. These cover work like routing assignees and posting messages. Assigns work evenly across a group of teammates. Triggers a celebration in the workspace for the team to see. Posts a message to a workspace channel or audience. ## Utilities A utility block handles iteration and external HTTP calls. These are the plumbing that the other categories depend on. See [HTTP and JSON patterns](/guides/platform-patterns/http-json-patterns) for common shapes. Runs a set of blocks once for each item in a collection. Turns a JSON string into structured fields you can reference. Calls an external API and returns its response. ## Third-party blocks Connected apps add their own triggers and actions to your block library. These include Slack, Outreach, Mailchimp, Mixmax, and Typeform. Newer ecosystem blocks cover Webflow, Notion, and Linear. Triggers and actions that connected apps add to your block library. *** *Source: [Workflows block library](https://attio.com/help/reference/automations/workflows/workflows-block-library). Last reviewed against the Attio Help Center, June 2026.* This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.