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Memory Stores

Memory stores provide persistent data storage scoped to a user, session, or application. Use them to maintain state and share data between agents and tools across interactions.

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Prerequisites

  • AgenticAI Core SDK installed and configured.
  • An App instance to attach memory stores to. See Building Applications.

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Configure a memory store

Define memory stores at design time and attach them to your application: 
from agenticai_core.designtime.models.memory_store import (
    MemoryStore, Namespace, NamespaceType,
    RetentionPolicy, RetentionPeriod, Scope
)

user_preferences = MemoryStore(
    name="User Preferences",
    technical_name="user_preferences",
    type="hotpath",
    description="Stores user-specific preferences",
    schema_definition={
        "type": "object",
        "properties": {
            "firstname": {"type": "string"},
            "lastname": {"type": "string"},
            "theme": {"type": "string"},
            "language": {"type": "string"}
        }
    },
    strict_schema=False,
    namespaces=[
        Namespace(
            name="session_id",
            type=NamespaceType.DYNAMIC,
            value="{session_id}",
            description="Session identifier"
        )
    ],
    scope=Scope.USER_SPECIFIC,
    retention_policy=RetentionPolicy(
        type=RetentionPeriod.MONTH,
        value=6
    )
)
Attach the store to your application: 
from agenticai_core.designtime.models.app import AppBuilder

app_config = AppBuilder() \
    .set_name("My App") \
    .set_memory_store(user_preferences) \
    .build()

app = App(**app_config)

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Memory store scopes

ScopeDescriptionUse for
USER_SPECIFICData unique to each user.Preferences, history, personalization.
APPLICATION_WIDEGlobal data shared across all users.Shared configuration, lookup tables.
SESSION_LEVELTemporary data cleared when the session ends.Caching, in-progress task state.
# User-specific
MemoryStore(name="User Data", scope=Scope.USER_SPECIFIC, ...)

# Application-wide
MemoryStore(name="App Config", scope=Scope.APPLICATION_WIDE, ...)

# Session-level
MemoryStore(name="Session Cache", scope=Scope.SESSION_LEVEL, ...)

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Retention policies

PeriodExample
Session (clears on session end)RetentionPolicy(type=RetentionPeriod.SESSION, value=1)
DaysRetentionPolicy(type=RetentionPeriod.DAY, value=7)
WeeksRetentionPolicy(type=RetentionPeriod.WEEK, value=2)
MonthsRetentionPolicy(type=RetentionPeriod.MONTH, value=6)
# 7 days
RetentionPolicy(type=RetentionPeriod.DAY, value=7)

# 2 weeks
RetentionPolicy(type=RetentionPeriod.WEEK, value=2)

# 6 months
RetentionPolicy(type=RetentionPeriod.MONTH, value=6)

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Runtime usage in tools

Access memory stores at runtime using RequestContext:

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Write data

from agenticai_core.designtime.models.tool import Tool
from agenticai_core.runtime.sessions.request_context import RequestContext

@Tool.register(description="Save user preferences")
async def save_preferences(firstname: str, lastname: str, theme: str = "light"):
    context = RequestContext()
    memory = context.get_memory()

    user_data = {
        "firstname": firstname,
        "lastname": lastname,
        "theme": theme
    }

    result = await memory.set_content('user_preferences', user_data)

    if result.success:
        return f"Preferences saved for {firstname} {lastname}"
    else:
        return "Failed to save preferences"

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Read data

Use projections to retrieve only the fields you need (1 = include field): 
@Tool.register(description="Get user greeting")
async def get_greeting():
    context = RequestContext()
    memory = context.get_memory()

    # Read with projections (1 = include field)
    result = await memory.get_content('user_preferences', {
        'firstname': 1,
        'lastname': 1,
        'theme': 1
    })

    if result.success and result.data:
        firstname = result.data.get('firstname', 'Guest')
        lastname = result.data.get('lastname', '')
        theme = result.data.get('theme', 'light')

        greeting = f"Hello {firstname} {lastname}!"
        if theme == 'dark':
            greeting += " 🌙"
        else:
            greeting += " ☀️"

        return greeting

    return "Hello Guest! Please set your preferences first."

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Delete data

@Tool.register(description="Clear user data")
async def clear_data():
    context = RequestContext()
    memory = context.get_memory()

    result = await memory.delete_content('user_preferences')

    if result.success:
        return "Data cleared successfully"
    else:
        return "Failed to clear data"

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Schema definition

Define a JSON Schema to validate data before storage: 
schema_definition = {
    "type": "object",
    "properties": {
        "user_data": {
            "type": "object",
            "properties": {
                "name": {"type": "string"},
                "email": {"type": "string", "format": "email"},
                "age": {"type": "integer", "minimum": 0}
            },
            "required": ["name", "email"]
        },
        "preferences": {
            "type": "array",
            "items": {"type": "string"}
        }
    }
}
Set strict_schema=True in production to enforce schema validation.

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Namespaces

Namespaces partition stored data within a store. Use dynamic namespaces for runtime values (user ID, session ID) and static namespaces for fixed values (environment, version).

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Dynamic namespaces

Namespace(
    name="session_id",
    type=NamespaceType.DYNAMIC,
    value="{session_id}",
    description="Session identifier"
)

Namespace(
    name="user_id",
    type=NamespaceType.DYNAMIC,
    value="{user_id}",
    description="User identifier"
)

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Static namespaces

Namespace(
    name="app_version",
    type=NamespaceType.STATIC,
    value="v1.0",
    description="Application version"
)

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Multiple namespaces

memory_store = MemoryStore(
    name="Conversation History",
    namespaces=[
        Namespace(
            name="user_id",
            type=NamespaceType.DYNAMIC,
            value="{user_id}",
            description="User identifier"
        ),
        Namespace(
            name="session_id",
            type=NamespaceType.DYNAMIC,
            value="{session_id}",
            description="Session identifier"
        ),
        Namespace(
            name="environment",
            type=NamespaceType.STATIC,
            value="production",
            description="Deployment environment"
        )
    ],
    ...
)

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Best practices

  • Schema design: Define specific schemas with required fields. Use strict_schema=True in production to prevent unexpected data. Validate data types explicitly.
  • Scope selection: Use USER_SPECIFIC for personal data. Use APPLICATION_WIDE only for data genuinely shared across all users. Use SESSION_LEVEL for temporary data.
  • Retention: Match retention period to actual data needs. Short-lived data (cart state, current step) should use session retention. Consider data privacy requirements.
  • Error handling: Always check result.success before accessing result.data. Provide fallback values for missing fields. Log errors with enough context to diagnose the issue.
  • Performance: Use projections when reading — fetch only the fields you need. Avoid memory reads in hot paths where possible. Cache frequently accessed data locally.
  • Security: Do not store sensitive data (passwords, tokens, PINs) in memory stores. Use appropriate scopes to isolate user data. Set conservative retention policies to limit exposure.

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Related resources