Pipelex Extension

Define, compose, and run AI methods in .mthds files — with full TOML support

A VS Code and Cursor extension that brings first-class editing support for MTHDS files and TOML. Rich syntax highlighting, semantic tokens, formatting, schema validation, completions, and more — built on Taplo and tracking upstream.

What is MTHDS? — An open standard for defining AI methods as typed, composable, human-readable files. A .mthds file describes what an AI should do — its inputs, outputs, logic, and data types — in plain TOML that both people and machines can read. Pipelex is the runtime that executes them. Learn more at docs.pipelex.com.

🚀 MTHDS Language Support

Context-aware highlighting and semantic tokens for every MTHDS construct — concepts, pipes, typed inputs and outputs, model references, Jinja2 templates, data injection, and more. Each construct gets its own distinct color so you can read a .mthds file at a glance.

domain = "hr_screening"
description = "Analyze a job offer to build a scorecard, batch process CVs"
main_pipe = "screen_candidates"

[concept.Scorecard]
description = "Evaluation scorecard built from a job offer"

[concept.Scorecard.structure]
job_title = { type = "text", required = true }
company = { type = "text" }
required_skills = { type = "list", item_type = "text" }
criteria = { type = "list", item_type = "concept", item_concept_ref = "hr_screening.Criterion" }

[pipe.screen_candidates]
type = "PipeSequence"
inputs = { job_offer = "Document", cvs = "Document[]" }
output = "CvResult[]"
steps = [
    { pipe = "extract_job_offer", result = "job_pages" },
    { pipe = "build_scorecard", result = "scorecard" },
    { pipe = "evaluate_cv", batch_over = "cvs", result = "results" },
]

[pipe.build_scorecard]
type = "PipeLLM"
inputs = { job_pages = "Page[]" }
output = "Scorecard"
model = "claude-4.6-opus"
prompt = """Analyze this job offer and build a scorecard..."""

See the MTHDS language reference for the full standard.

🔧 Full TOML Support

Beyond MTHDS, this extension replaces your TOML extension with complete language support — formatting, completions, hover documentation, go-to-definition, rename, diagnostics, schema validation via JSON Schema Store.

⚙️ Configuration

The extension looks for a settings file at .pipelex/plxt.toml (preferred) or plxt.toml in your project root. The format is the same as a standard Taplo configuration file — use it to configure formatting rules, schema associations, and linting options for both .mthds and .toml files.

📦 Installation

1. Extensions marketplace — Search for "Pipelex" in the Extensions view
2. Command line — code --install-extension Pipelex.pipelex or cursor --install-extension Pipelex.pipelex
3. Manual — Download .vsix from releases

"Pipelex" is a trademark of Evotis S.A.S.