Telo Standard Library

The Telo standard library is the collection of modules that ship with the kernel — ready-to-import building blocks for AI, HTTP, storage, workflow orchestration, encoding, runtime targets, scripting, and ops. Each module is self-contained, declared by its own telo.yaml, and composes into your application through Telo.Import.

For how modules are defined, imported, and composed, see the Module Specification.

Modules by domain

AI

Module	Description
ai	LLM access via Ai.Model, Ai.Text (buffered), and Ai.TextStream (streaming).
ai-openai	OpenAI provider implementing Ai.OpenaiModel.

HTTP & APIs

Module	Description
http-server	Language-agnostic HTTP server and routing (Http.Server, Http.Api).
http-client	Outgoing HTTP calls (Http.Client, Http.Request).
mcp-server	Model Context Protocol server transports and tool bundles.
mcp-client	MCP client transports plus tools/call and tools/list dispatch.

Storage & Data

Module	Description
sql	PostgreSQL and SQLite via Sql.Connection, Sql.Query, Sql.Exec, Sql.Select, Sql.Transaction, and migrations.
sql-repository	Domain-shaped CRUD over a table via SqlRepository.Read/Create/Delete.
s3	S3-compatible object storage.
type	Named data types via Type.JsonSchema.
yaml	YAML parsing primitives.

Workflow & Control Flow

Module	Description
run	Unified sequence execution with invoke, if, while, switch, and try steps.
workflow	Workflow orchestration primitives with pluggable backends.
workflow-temporal	Temporal backend for Workflow.Graph.

Encoding & Streams

Module	Description
codec	Codec.Encoder and Codec.Decoder abstracts.
plain-text-codec	UTF-8 plain-text encoder and decoder.
ndjson-codec	Newline-delimited JSON encoder.
sse-codec	Server-Sent Events encoder.
octet-codec	Raw byte encoder and decoder.
record-stream	Record stream primitives.

Runtime Targets

Module	Description
lambda	Run your manifest as an AWS Lambda function (Lambda.Function, Lambda.HttpApi, Lambda.Sqs, Lambda.Direct).

Scripting

Module	Description
javascript	Inline JavaScript execution via JavaScript.Script.
starlark	Deterministic, bounded scripting via Starlark.Script.

Configuration & Ops

Module	Description
config	Environment variables, secrets, and composed config via Config.*.
console	Console I/O via Console.WriteLine and Console.ReadLine.
benchmark	Load benchmarking for any invocable Telo resource.

Testing

Module	Description
assert	Assertion and value verification for testing.
test	Test runner for YAML-based test suites.