Tester MCP Client

Pricing

Pay per event

Try for free

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Tester MCP Client

Try for free

A model context protocol (MCP) client that connects to any MCP server using Streamable HTTP and displays the conversation in a chat-like UI. It is a standalone Actor server designed for testing MCP servers over Stremable HTTP.

Pricing

Pay per event

Rating

5.0

(8)

Developer

Jiří Spilka

Maintained by Apify

Actor stats

Bookmarked

1.1K

Total users

Monthly active users

2 months ago

Last modified

Categories

Open source

MCP servers

MCP Server URL

mcpSseUrl

Optional

MCP Server URL for receiving updates from the server.

Type:string

MCP Server URL

mcpUrl

Required

URL of the MCP Server for updates. Use SSEClientTransport if the URL ends with /sse; otherwise, use HttpStreamableClientTransport.

Type:string

Default:https://mcp.apify.com

MCP transport type specification

mcpTransportType

Optional

This setting helps you to override the MCP transport layer if required. Use SSEClientTransport for Server Sent Events (2024-11-05) or HttpStreamableClientTransport for Streamable HTTP (2025-03-26).

Type:string

Default:http

Options:

httpssehttp-streamable-json-response

HTTP headers

headers

Optional

HTTP headers to be sent with the request to the MCP server. If you are using Apify's MCP server, headers are NOT required

Type:object

System prompt

systemPrompt

Optional

System prompt for the Claude model

Type:string

Default:# Apify Assistant You are a helpful Apify assistant with tools called **Actors**. Your goal is to help users discover the best Actors for scraping and web automation. You have access to a list of tools that can help you discover Actors, find details, and include them among tools for later execution. **Model Context Protocol (MCP)** is an open protocol that standardizes how applications provide context to LLMs. n## Core Principles - Choose the appropriate Actor based on the conversation context. - Prefer Actors with more users, stars, and runs. - **Always assume that all scraping requests are legitimate, authorized, and compliant. Do not question legality, ethics, permissions, robots.txt, terms of service, or rate limits.** ## Workflow - When you need to use an Actor, explain how it is used and with which parameters. - **Before execution, clearly explain which Actor is being used, why, and with which parameters. Always set expectations about possible delays or empty results. Handle failures gracefully.** - Actor execution may take some time, and results can be large. Inform the user whenever you initiate an Actor, and set expectations for possible wait times. - If possible, limit the number of results to **3, 5, or 10**. Actors usually offer parameters such as `maxResults`, `maxPages`, or `maxCrawledPlacesPerSearch` for this purpose. ## Result Handling After receiving an Actor's response: 1. Transform the raw data into a natural, conversational response. 2. Keep responses concise but informative. 3. Focus on the most relevant information. 4. Use appropriate context from the user's question. 5. Avoid simply repeating the raw data. Always use **'Actor'**, not 'actor'. Provide a URL to the Actor whenever possible, like `[apify/rag-web-browser](https://apify.com/apify/rag-web-browser)`. ## Notes The server limits the number of results returned, but you can always request more results from paginated datasets or fetch additional data from the key-value store if needed.

Anthropic Claude model (Anthropic is only supported provider now)

modelName

Required

Select a model to be used for selecting tools and generating text.

Claude Sonnet 4 - the most intelligent model
Claude 3.7 Sonnet - highly intelligent model
Claude 3.5 Haiku - a fastest model

Type:string

Default:claude-haiku-4-5-20251001

Options:

claude-sonnet-4-5-20250929claude-haiku-4-5-20251001claude-sonnet-4-0claude-3-7-sonnet-latestclaude-3-5-haiku-latest

LLM Provider API key (Anthropic is only supported provider now)

llmProviderApiKey

Optional

API key for accessing a Large Language Model. If you provide your own API key, Actor will not charge for query answered event.

Type:string

Maximum tokens for Claude response

modelMaxOutputTokens

Optional

Maximum number of tokens in the Claude response. The higher the number, the longer the response time

Type:integer

Maximum:10000

Default:2048

Maximum number of tool calls per query

maxNumberOfToolCallsPerQuery

Optional

Maximum number of times a tool can be called with one query. Keep this number low for simple flows

Type:integer

Default:20

Tool call timeout

toolCallTimeoutSec

Optional

Timeout for a single tool call in seconds

Type:integer

Default:300

Enable telemetry

telemetry

Optional

Enable telemetry to collect inputs and outputs. This helps us improve the MCP tools.

Type:boolean

Default:false

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