Task Storage

ra2a supports multiple storage backends for persisting task state. By default, tasks are stored in-memory and lost on restart.

In-Memory (Default)

No configuration needed — tasks are stored in a DashMap and lost when the server stops:

A2AServerBuilder::new()
    .executor(my_agent)
    .build()
    .serve()
    .await?;

PostgreSQL

cargo add ra2a --features postgresql

use ra2a::storage::PostgresTaskStore;

let store = PostgresTaskStore::new("postgres://user:pass@localhost/a2a").await?;

A2AServerBuilder::new()
    .executor(my_agent)
    .task_store(store)
    .build()
    .serve()
    .await?;

MySQL

cargo add ra2a --features mysql

use ra2a::storage::MysqlTaskStore;

let store = MysqlTaskStore::new("mysql://user:pass@localhost/a2a").await?;

SQLite

cargo add ra2a --features sqlite

use ra2a::storage::SqliteTaskStore;

let store = SqliteTaskStore::new("sqlite://tasks.db").await?;

All SQL Backends

Enable all SQL backends at once:

cargo add ra2a --features sql

Feature Flag Summary

Flag	Backend	Use case
(default)	In-memory	Development, stateless agents
`postgresql`	PostgreSQL	Production, distributed deployments
`mysql`	MySQL	Production, existing MySQL infrastructure
`sqlite`	SQLite	Single-server deployments, edge
`sql`	All of the above	Maximum flexibility

Schema Migration

SQL backends automatically run migrations on startup. No manual schema setup is required.

In-Memory (Default)​

PostgreSQL​

MySQL​

SQLite​

All SQL Backends​

Feature Flag Summary​

Schema Migration​