--- title: After Execution Modifiers description: Transform tool results after execution llmGuardrails: "direct-execution" --- If you're building an agent, we recommend using [sessions](/docs/configuring-sessions) instead. See [Tools and toolkits](/docs/tools-and-toolkits#meta-tools) for how sessions handle tool discovery and execution automatically. After execution modifiers are part of Composio SDK's powerful middleware capabilities that allow you to customize and extend the behavior of tools. These modifiers are called after the tool is executed. This allows you to modify the result of the tool before it is returned to the agent. **Useful for:** - Modifying or truncating the output of the tool - Converting the output to a different format before returning it to the agent

Below we use the `afterExecute` modifier to truncate the output of `HACKERNEWS_GET_USER` and only return the karma of the user. ## With Chat Completions Since completion providers don't have a function execution step, Composio executes the tool call directly. The modifier is configured on the `tools.execute` method. ```python from composio import Composio, after_execute from composio.types import ToolExecutionResponse @after_execute(tools=["HACKERNEWS_GET_USER"]) def after_execute_modifier( tool: str, toolkit: str, response: ToolExecutionResponse, ) -> ToolExecutionResponse: return { **response, "data": { "karma": response["data"]["karma"], }, } tools = composio.tools.get(user_id=user_id, slug="HACKERNEWS_GET_USER") # Get response from the LLM response = openai_client.chat.completions.create( model="gpt-5.4", tools=tools, messages=messages, ) print(response) # Execute the function calls result = composio.provider.handle_tool_calls( response=response, user_id="default", modifiers=[ after_execute_modifier, ] ) print(result) ``` ```typescript // @noErrors const response = await openai.chat.completions.create({ model: "gpt-5.4", messages, tools, tool_choice: "auto", }); const { tool_calls } = response.choices[0].message; console.log(tool_calls); if (tool_calls) { const { function: { arguments: toolArgs }, } = tool_calls[0]; const result = await composio.tools.execute( "HACKERNEWS_GET_USER", { userId, arguments: JSON.parse(toolArgs), }, { afterExecute: ({ toolSlug, toolkitSlug, result }) => { if (toolSlug === "HACKERNEWS_GET_USER") { const { data } = result; const { karma } = data.response_data as { karma: number }; return { ...result, data: { karma }, }; } return result; }, } ); console.log(JSON.stringify(result, null, 2)); } ``` ## With Agentic Frameworks Agentic providers have a function execution step. The modifier is configured on the `tools.get` method which modifies the execution logic within the framework. ```python from composio import Composio, after_execute from composio.types import ToolExecutionResponse from composio_crewai import CrewAIProvider composio = Composio(provider=CrewAIProvider()) @after_execute(tools=["HACKERNEWS_GET_USER"]) def after_execute_modifier( tool: str, toolkit: str, response: ToolExecutionResponse, ) -> ToolExecutionResponse: return { **response, "data": { "karma": response["data"]["karma"], }, } tools = composio.tools.get( user_id="default", slug="HACKERNEWS_GET_USER", modifiers=[ after_execute_modifier, ] ) ``` ```typescript // @noErrors import { Composio } from "@composio/core"; import { VercelProvider } from "@composio/vercel"; import { v4 as uuidv4 } from "uuid"; const composio = new Composio({ apiKey: process.env.COMPOSIO_API_KEY, provider: new VercelProvider(), }); const userId = uuidv4(); const agenticTools = await composio.tools.get( userId, { tools: ["HACKERNEWS_GET_USER"], }, { afterExecute: ({ toolSlug, toolkitSlug, result }) => { if (toolSlug === "HACKERNEWS_GET_USER") { const { data: { response_data: { karma } = {} } = {}, } = result; return { ...result, data: { karma }, }; } return result; }, } ); ``` ## What to read next } title="Before execution modifiers" href="/docs/tools-direct/modify-tool-behavior/before-execution-modifiers" description="Modify tool arguments before execution" /> } title="Schema modifiers" href="/docs/tools-direct/modify-tool-behavior/schema-modifiers" description="Customize how tools appear to agents" /> } title="Executing tools" href="/docs/tools-direct/executing-tools" description="Run tools with providers, agentic frameworks, or direct execution" />