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Sema

A Scheme-like Lisp with runtime types for prompts, messages, conversations, tools, and agents, implemented in Rust.

For agents: Sema: Scheme-like Lisp implemented in Rust with runtime types for prompts, conversations, tools and agents; stdlib, LLM and observability docs.

lispschemerustllm promptsagents

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-23T23:50:56.629Z. Cached copy · Source on sema-lang.com

# Sema

> A Scheme-like Lisp with runtime types for prompts, messages, conversations, tools, and agents, implemented in Rust.

[Sema context](https://sema-lang.com/ai.txt) describes the project and runtimes; [documentation context](https://sema-lang.com/docs/ai.txt) explains how to use this reference.

**Coding agents: read [Sema for LLM agents](https://sema-lang.com/docs/for-agents.md) first** — a compact working guide to the rules most likely to cause incorrect generated code. The essentials:

- New functions are slash-namespaced (`file/read`, `string/split`, `regex/match?`); predicates end in `?`; conversions use `->`. Legacy Scheme string ops are kept (`string-append`).
- `nil` and `()` are distinct. Only `#f` and `nil` are falsy; `0`, `""`, and `()` are truthy.
- Lists are contiguous immutable sequences (O(1) `nth`, O(n) `cons`); mutable bindings use `define` + `set!` (there is no `atom`/`swap!`).
- Clojure-style surface: `:keywords`, `{:k v}` maps, `[1 2 3]` vectors, `#(* % %)` lambdas, `f"...${x}"` strings, `#"regex"` literals.
- LLMs are language primitives: `llm/complete`, `deftool`/`agent/run`, `llm/extract`, cassettes, OpenTelemetry, vector store.

The table of contents below indexes the full docs — fetch only the specific `/docs/**/*.md` pages you need, on demand. Do not load `/llms-full.txt` (the large full concatenation) into context.

## Table of Contents

### Standard Library Reference

- [Standard Library](https://sema-lang.com/docs/stdlib.md)

### Core Types

- [Math & Arithmetic](https://sema-lang.com/docs/stdlib/math.md)
- [Strings & Characters](https://sema-lang.com/docs/stdlib/strings.md)
- [Lists](https://sema-lang.com/docs/stdlib/lists.md)
- [Vectors](https://sema-lang.com/docs/stdlib/vectors.md)
- [Maps & HashMaps](https://sema-lang.com/docs/stdlib/maps.md)
- [Predicates & Type Checking](https://sema-lang.com/docs/stdlib/predicates.md)
- [Bytevectors](https://sema-lang.com/docs/stdlib/bytevectors.md)
- [Typed Arrays](https://sema-lang.com/docs/stdlib/typed-arrays.md)
- [Mutable Containers](https://sema-lang.com/docs/stdlib/mutable.md)

### File & Data Formats

- [File I/O & Paths](https://sema-lang.com/docs/stdlib/file-io.md)
- [PDF Processing](https://sema-lang.com/docs/stdlib/pdf.md)
- [CSV](https://sema-lang.com/docs/stdlib/csv.md)
- [TOML](https://sema-lang.com/docs/stdlib/toml.md)
- [Archives](https://sema-lang.com/docs/stdlib/archive.md)
- [Diff & Patch](https://sema-lang.com/docs/stdlib/diff.md)
- [Markdown & HTML](https://sema-lang.com/docs/stdlib/markup.md)

### Networking & Web

- [HTTP & JSON](https://sema-lang.com/docs/stdlib/http-json.md)
- [Web Server](https://sema-lang.com/docs/stdlib/web-server.md)

### System & Databases

- [System](https://sema-lang.com/docs/stdlib/system.md)
- [Processes & PTYs](https://sema-lang.com/docs/stdlib/process.md)
- [Git (read-only)](https://sema-lang.com/docs/stdlib/git.md)
- [SQLite](https://sema-lang.com/docs/stdlib/sqlite.md)
- [Key-Value Store](https://sema-lang.com/docs/
…

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