Kestrion

The agentic standard library

Deterministic primitives for AI agents via MCP. Give your agents memory, coordination, and identity — without orchestration overhead.

Get started — 100 free tool calls View tools ↓

Primitives

State & Storage

kv_get / kv_put
Key-value storage
kv_cas
Compare-and-set for safe updates
set_add / set_has
Set membership
counter_inc / counter_get
Atomic counters

Coordination

queue_push / queue_pop
FIFO message queues
queue_ack
Acknowledge processed items

Identity & Time

uuid_generate
Time-ordered UUIDs (v7)
clock_now
Current UTC timestamp

Quick start

Add Kestrion to your MCP config:

{
  "mcpServers": {
    "kestrion": {
      "type": "sse",
      "url": "https://mcp.kestrion.com/v1"
    }
  }
}

Works with VS Code, Claude Desktop, and any MCP-compatible client.

Not orchestration

We don't tell your agents what to do. We give them tools to self-organize and coordinate.

Deterministic

Every tool call has predictable, consistent behavior. No surprises, no hallucinations.

First of its kind

MCP as a service. The primitives agents actually need, available as tool calls.