Error Handling in FastMCP Servers
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Resource and Prompt Error Handling
In the previous examples, we focused on tool errors, but the same principles apply to resources and prompts. For example, if a resource fails to load due to a missing file or database entry, you can raise a ResourceError with a clear message:
from fastmcp.exceptions import ResourceError
@mcp.resource("config://{name}")
def get_config(name: str) -> str:
"""Read a configuration file by name."""
config_dir = Path("configs")
config_file = config_dir / f"{name}.json"
if not config_file.exists():
raise ResourceError(f"Configuration '{name}' not found.")
return config_file.read_text()
Same thing goes for prompts:
# Prompt: realistic use case
from fastmcp.exceptions import PromptError
TEMPLATESPractical MCP with FastMCP & LangChain
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