Tools Overview

Tools are callable functions the LLM can invoke to take real-world actions. Each tool has a clear name, typed parameters, and a docstring description so Claude knows exactly when and how to use it.

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All Tools at a Glance

Tool	Category	Description
factorial_safe_forLLM	Basic	Returns n! with safe error handling
echo	Basic	Echoes back any message — great for connectivity checks
add_note	Storage	Appends text to a local notes file
read_notes	Storage	Reads all saved notes
get_cryptocurrency_price	API	Fetches live crypto prices via CoinGecko
perform_web_search	API	Searches the web via Perplexity/OpenAI
capture_screenshot	Visual	Takes a screenshot and returns it as JPEG
add_person_to_member_database	Storage	Logs a structured Person record
save_memory	Memory	Saves text to an OpenAI vector store
search_memory	Memory	Semantic search over saved memories

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How Tools Work

sequenceDiagram
    participant U as User
    participant C as Claude
    participant S as MCP Server
    participant X as External Service

    U->>C: "What's the Bitcoin price?"
    C->>S: Call get_cryptocurrency_price("bitcoin")
    S->>X: GET api.coingecko.com
    X-->>S: { "bitcoin": { "usd": 67000 } }
    S-->>C: "The current price of bitcoin is $67,000 USD."
    C-->>U: Friendly answer with context

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Copy-paste test prompts

See the 💬 Chat Prompt Recipes section for ready-made prompts to test every tool.