Tabnas MCP server

What it does

Tabnas exposes a parsing engine through seven tools for grammar validation, parsing, testing, and comparison. It serves developers who work with custom grammars and need to parse, validate, and test input against grammar specifications.

• Parse input text against a custom grammar and get back a parse tree or a diagnostic error.
• Test a grammar definition against a suite of TSV fixtures to verify expected behavior.
• Compare two grammar versions to detect whether the new grammar accepts the same inputs and produces identical trees as the old one.

Tools this server exposes

Tool	Does
parse	Parse input text against a grammar and return the parse tree or a diagnostic error.
validate_grammar	Validate a serialized grammar specification for structural correctness and security.
explain_parse_error	Explain why a given input failed to parse, with reference to the error code registry.
test_grammar	Run a grammar against TSV fixtures and report pass/fail results for each test row.
list_plugins	List all available grammar plugins.
describe_plugin	Return the full descriptor object for a specific grammar plugin.
compare_grammars	Compare two grammar definitions to check backward compatibility and tree equivalence.

Before you enable it

An MCP server runs with whatever access you give it. Start with a development account rather than production, and check which tools the server exposes before you let an agent call them unattended.