Tool components in Langflow

Tools are typically connected to agent components at the Tools port. Agents use LLMs as a reasoning engine to decide which of the connected tool components to use to solve a problem.

Tools in agentic functions are, essentially, functions that the agent can call to perform tasks or access external resources. A function is wrapped as a Tool object, with a common interface the agent understands. Agents become aware of tools through tool registration, where the agent is provided a list of available tools, typically at agent initialization. The Tool object's description tells the agent what the tool can do.

The agent then uses a connected LLM to reason through the problem to decide which tool is best for the job.

Use a tool in a flow

Tools are typically connected to agent components at the Tools port.

The simple agent starter project uses URL and Calculator tools connected to an agent component to answer a user's questions. The OpenAI LLM acts as a brain for the agent to decide which tool to use.

To make a component into a tool that an agent can use, enable Tool mode in the component. Enabling Tool mode modifies a component input to accept calls from an agent. If the component you want to connect to an agent doesn't have a Tool mode option, you can modify the component's inputs to become a tool. For an example, see Make any component a tool.

Bing Search API

This component allows you to call the Bing Search API.

Parameters

Inputs

Name	Type	Description
bing_subscription_key	SecretString	Bing API subscription key
input_value	String	Search query input
bing_search_url	String	Custom Bing Search URL (optional)
k	Integer	Number of search results to return

Outputs

Name	Type	Description
results	List[Data]	List of search results
tool	Tool	Bing Search tool for use in LangChain

Calculator Tool

This component creates a tool for performing basic arithmetic operations on a given expression.

Parameters

Inputs

Name	Type	Description
expression	String	The arithmetic expression to evaluate (e.g., 4*4*(33/22)+12-20).

Outputs

Name	Type	Description
result	Tool	Calculator tool for use in LangChain

This component allows you to evaluate basic arithmetic expressions. It supports addition, subtraction, multiplication, division, and exponentiation. The tool uses a secure evaluation method that prevents the execution of arbitrary Python code.

Combinatorial Reasoner

This component runs Icosa's Combinatorial Reasoning (CR) pipeline on an input to create an optimized prompt with embedded reasons. Sign up for access here: https://forms.gle/oWNv2NKjBNaqqvCx6

Parameters

Inputs

Name	Display Name	Description
prompt	Prompt	Input to run CR on
openai_api_key	OpenAI API Key	OpenAI API key for authentication
username	Username	Username for Icosa API authentication
password	Password	Password for Icosa API authentication
model_name	Model Name	OpenAI LLM to use for reason generation

Outputs

Name	Display Name	Description
optimized_prompt	Optimized Prompt	A message object containing the optimized prompt
reasons	Selected Reasons	A list of the selected reasons that are embedded in the optimized prompt

Glean Search API

This component allows you to call the Glean Search API.

Parameters

Inputs

Name	Type	Description
glean_api_url	String	URL of the Glean API
glean_access_token	SecretString	Access token for Glean API authentication
query	String	Search query input
page_size	Integer	Number of results per page (default: 10)
request_options	Dict	Additional options for the API request (optional)

Outputs

Name	Type	Description
results	List[Data]	List of search results
tool	Tool	Glean Search tool for use in LangChain

Google Search API

This component allows you to call the Google Search API.

Parameters

Inputs

Name	Type	Description
google_api_key	SecretString	Google API key for authentication
google_cse_id	SecretString	Google Custom Search Engine ID
input_value	String	Search query input
k	Integer	Number of search results to return

Outputs

Name	Type	Description
results	List[Data]	List of search results
tool	Tool	Google Search tool for use in LangChain

Google Serper API

This component allows you to call the Serper.dev Google Search API.

Parameters

Inputs

Name	Type	Description
serper_api_key	SecretString	API key for Serper.dev authentication
input_value	String	Search query input
k	Integer	Number of search results to return

Outputs

Name	Type	Description
results	List[Data]	List of search results
tool	Tool	Google Serper search tool for use in LangChain

Python Code Structured Tool

This component creates a structured tool from Python code using a dataclass.

The component dynamically updates its configuration based on the provided Python code, allowing for custom function arguments and descriptions.

Parameters

Inputs

Name	Type	Description
tool_code	String	Python code for the tool's dataclass
tool_name	String	Name of the tool
tool_description	String	Description of the tool
return_direct	Boolean	Whether to return the function output directly
tool_function	String	Selected function for the tool
global_variables	Dict	Global variables or data for the tool

Outputs

Name	Type	Description
result_tool	Tool │ Structured tool created from the Python code

Python REPL Tool

This component creates a Python REPL (Read-Eval-Print Loop) tool for executing Python code.

Parameters

Inputs

Name	Type	Description
name	String	The name of the tool (default: "python_repl")
description	String	A description of the tool's functionality
global_imports	List[String]	List of modules to import globally (default: ["math"])

Outputs

Name	Type	Description
tool	Tool	Python REPL tool for use in LangChain

Retriever Tool

This component creates a tool for interacting with a retriever in LangChain.

Parameters

Inputs

Name	Type	Description
retriever	BaseRetriever	The retriever to interact with
name	String	The name of the tool
description	String	A description of the tool's functionality

Outputs

Name	Type	Description
tool	Tool	Retriever tool for use in LangChain

SearXNG Search Tool

This component creates a tool for searching using SearXNG, a metasearch engine.

Parameters

Inputs

Name	Type	Description
url	String	The URL of the SearXNG instance
max_results	Integer	Maximum number of results to return
categories	List[String]	Categories to search in
language	String	Language for the search results

Outputs

Name	Type	Description
result_tool	Tool	SearXNG search tool for use in LangChain

Search API

This component calls the searchapi.io API. It can be used to search the web for information.

For more information, see the SearchAPI documentation.

Parameters

Inputs

Name	Display Name	Info
engine	Engine	The search engine to use (default: "google")
api_key	SearchAPI API Key	The API key for authenticating with SearchAPI
input_value	Input	The search query or input for the API call
search_params	Search parameters	Additional parameters for customizing the search

Outputs

Name	Display Name	Info
data	Search Results	List of Data objects containing search results
tool	Search API Tool	A Tool object for use in LangChain workflows

Serp Search API

This component creates a tool for searching using the Serp API.

Parameters

Inputs

Name	Type	Description
serpapi_api_key	SecretString	API key for Serp API authentication
input_value	String	Search query input
search_params	Dict	Additional search parameters (optional)

Outputs

Name	Type	Description
results	List[Data]	List of search results
tool	Tool	Serp API search tool for use in LangChain

Wikipedia API

This component creates a tool for searching and retrieving information from Wikipedia.

Parameters

Inputs

Name	Type	Description
input_value	String	Search query input
lang	String	Language code for Wikipedia (default: "en")
k	Integer	Number of results to return
load_all_available_meta	Boolean	Whether to load all available metadata (advanced)
doc_content_chars_max	Integer	Maximum number of characters for document content (advanced)

Outputs

Name	Type	Description
results	List[Data]	List of Wikipedia search results
tool	Tool	Wikipedia search tool for use in LangChain

Wolfram Alpha API

This component creates a tool for querying the Wolfram Alpha API.

Parameters

Inputs

Name	Type	Description
input_value	String	Query input for Wolfram Alpha
app_id	SecretString	Wolfram Alpha API App ID

Outputs

Name	Type	Description
results	List[Data]	List containing the Wolfram Alpha API response
tool	Tool	Wolfram Alpha API tool for use in LangChain

Yahoo Finance News Tool

This component creates a tool for retrieving news from Yahoo Finance.

Parameters

This component does not have any input parameters.

Outputs

Name	Type	Description
tool	Tool	Yahoo Finance News tool for use in LangChain

Astra DB Tool

The Astra DB Tool allows agents to connect to and query data from Astra DB Collections.

Parameters

Inputs

Name	Type	Description
Tool Name	String	The name used to reference the tool in the agent's prompt.
Tool Description	String	A brief description of the tool. This helps the model decide when to use it.
Collection Name	String	The name of the Astra DB collection to query.
Token	SecretString	The authentication token for accessing Astra DB.
API Endpoint	String	The Astra DB API endpoint.
Projection Fields	String	The attributes to return, separated by commas. Default: "*".
Tool Parameters	Dict	Parameters the model needs to fill to execute the tool. For required parameters, use an exclamation mark (e.g., "!customer_id").
Static Filters	Dict	Attribute-value pairs used to filter query results.
Limit	String	The number of documents to return.

Astra DB CQL Tool

The Astra DB CQL Tool allows agents to query data from CQL Tables in Astra DB.

Parameters

Inputs

Name	Type	Description
Tool Name	String	The name used to reference the tool in the agent's prompt.
Tool Description	String	A brief description of the tool to guide the model in using it.
Keyspace	String	The name of the keyspace.
Table Name	String	The name of the Astra DB CQL table to query.
Token	SecretString	The authentication token for Astra DB.
API Endpoint	String	The Astra DB API endpoint.
Projection Fields	String	The attributes to return, separated by commas. Default: "*".
Partition Keys	Dict	Required parameters that the model must fill to query the tool.
Clustering Keys	Dict	Optional parameters the model can fill to refine the query. Required parameters should be marked with an exclamation mark (e.g., "!customer_id").
Static Filters	Dict	Attribute-value pairs used to filter query results.
Limit	String	The number of records to return.