P8001

Code

P8001

Message

MCP tool input validation error

This error occurs when an MCP tool receives inputs that fail validation before the compiler runs. The tool returns this diagnostic with ok: false and does not proceed to parsing or analysis.

Common causes

  1. A source entry has an empty name.

  2. A source name exceeds 256 bytes.

  3. A source name contains characters outside the allowed set (printable ASCII: 0x20–0x7E).

  4. Two source entries share the same name.

  5. The options object is missing the required dialect key.

  6. The options.dialect value is not a known dialect (use list_options to see valid values).

  7. The options object contains an unrecognised key.

To fix this error, correct the tool input and call the tool again. Use the list_options tool to discover the valid dialect identifiers and feature-flag keys.

Think IronPLC is wrong about this?

If you believe this diagnostic is incorrect, open an issue on GitHub with a small sample that demonstrates the problem.