Amazon Bedrock Studio is in preview release and is subject to change.
Prompt Flow nodes available in Amazon Bedrock Studio
Amazon Bedrock Studio provides the following node types to build your Prompt Flow app. A node comprises of the following:
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Name – The name for the node.
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Type – the type of the node. For more information, see Prompt Flow nodes available in Amazon Bedrock Studio.
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Inputs – Provide a name and data type for each input. Some nodes have pre-defined names or types that you must use. In the expression field, define the part of the whole input to use as the individual input. For more information, see Define inputs with expressions.
In the flow builder, an input appears as a circle on the left edge of a node. Connect each input to an output of an upstream node.
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Outputs – Provide a name and data type for each output. Some nodes have pre-defined names or types that you must use. In the flow builder, an output appears as a circle on the right edge of a node. Connect each output to at least one input in a downstream node. If an output from a node is sent to more than one node, or if a condition node is included, the path of a flow will split into multiple branches. Each branch can potentially yield another output in the flow response.
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Configuration – You define node-specific fields at the top of the node.
Note
Amazon Bedrock Studio supports a subset of the nodes that are available in Amazon Bedrock. For more information, see Node types in flow.
Flow input
Every flow contains only one flow input node and must begin with it. When you run the flow, the input is fed into this node and the configured output is passed to the next step.
Configuration
Node name – N/A
Input field name – N/A
Input field types – N/A
Input expression – N/A
Output field name – document
Output field types – String, Number, Boolean, Object and Array.
Output expression – No
Flow output
A flow output node extracts the input data from the previous node, based on the defined expression, and returns it. A flow can have multiple flow output nodes if there are multiple branches in the flow.
Node name – Any
Input field name – document
Input field types – String, Number, Boolean, Object and Array.
Input expression – Yes
Output field name – N/A
Output field types – N/A
Output expression – N/A
Condition
A condition node sends data from the previous node to different nodes, depending on the conditions that are defined. A condition node can take multiple inputs.
Node name – Any
Input field name – Any
Input field types – String, Number, Boolean, Object and Array.
Input expression – Yes
Condition field name – Any
Output field types – String, Number, Boolean, Object and Array.
Output expression – Yes
Condition expressions
To define a condition, you refer to an input by its name and compare it to a value using any of the following relational operators:
| Operator | Meaning | Supported data types | Example usage | Example meaning |
|---|---|---|---|---|
| == | Equal to (the data type must also be equal) | String, Number, Boolean | A == B | If A is equal to B |
| != | Not equal to | String, Number, Boolean | A != B | If A isn't equal to B |
| > | Greater than | Number | A > B | If A is greater than B |
| >= | Greater than or equal to | Number | A >= B | If A is greater than or equal to B |
| < | Less than | Number | A < B | If A is less than B |
| <= | Less than or equal to | Number | A <= B | If A is less than or equal to B |
You can compare inputs to other inputs or to a constant in a conditional
expression. For example, if you have a numerical input called profit and another one called expenses, both profit > expenses or profit <= 1000 are valid expressions.
You can use the following logical operators to combine expressions for more complex conditions. We recommend that you use parentheses to resolve ambiguities in grouping of expressions:
| Operator | Meaning | Example usage | Example meaning |
|---|---|---|---|
| and | Both expressions are true | (A < B) and (C == 1) | If both expressions are true:
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| or | At least one expression is true | (A != 2) or (B > C) | If either expressions is true:
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| not | The expression isn't true | not (A > B) | If A isn't greater than B (equivalent to A <= B) |
Prompt node
A prompt node defines a prompt to use in the flow. The inputs to the prompt node are values to fill in the variables that you define for the prompt. The output is the generated response from the model. For more information, see Use prompts with your Flows app.
Node name – Any
Prompt – The prompt that the prompt node uses.
Version – The prompt the version of the prompt.
Input field name – The name of the prompt variable.
Input field types – String, Number, Boolean, Object and Array.
Input expression – Yes
Condition field name – modelCompletion
Output field types – String
Output expression – No
Knowledge Base node
A Knowledge Base node lets you send a query to a knowledge base. For more information, see Knowledge Base data source.
Node name – Any
Knowledge base – The Knowledge Base that the node uses.
Response type – The model that the node uses to generate a response.
Input field name – retrievalQuery
Input field types – String
Input expression – Yes
Condition field name – outputText
Output field types – String
Output expression – No
