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2026-01-29 12:45:45 -08:00
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131
fern/pages/cloud/templates.mdx
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---
title: Introduction to Agent Templates
slug: guides/templates/overview
---
<Tip>
Agent Templates are a feature in [Letta Cloud](/guides/cloud) that allow you to quickly spawn new agents from a common agent design.
</Tip>
Agent templates allow you to create a common starting point (or *template*) for your agents.
You can define the structure of your agent (its tools and memory) in a template,
then easily create new agents off of that template.
<Frame>
```mermaid
flowchart TD
subgraph Template["Agent Template v1.0"]
tools["Custom Tools
--------
tool_1
tool_2
tool_3"]
memory["Memory Structure
---------------
system_instructions
core_memory
archival_memory"]
end
Template --> |Deploy| agent1["Agent 1
--------
Custom state"]
Template --> |Deploy| agent2["Agent 2
--------
Custom state"]
Template --> |Deploy| agent3["Agent 3
--------
Custom state"]
class Template template
class agent1,agent2,agent3 agent
```
</Frame>
Agent templates support [versioning](/guides/templates/versioning), which allows you to programatically
upgrade all agents on an old version of a template to the new version of the same template.
Agent templates also support [memory variables](/guides/templates/variables), a way to conveniently customize
sections of memory at time of agent creation (when the template is used to create a new agent).
## Agents vs Agent Templates
**Templates** define a common starting point for your **agents**, but they are not agents themselves.
When you are editing a template in the ADE, the ADE will simulate an agent for you
(to help you debug and design your template), but the simulated agent in the simulator is not retained.
You can refresh the simulator and create a new simulated agent from your template at any time by clicking the "Flush Simulation" button 🔄 (at the top of the chat window).
To create a persistent agent from an existing template, you can use the [create agents from template endpoint](/api-reference/templates/agents/create):
```sh
curl -X POST https://app.letta.com/v1/templates/{template_name}:{template_version} \
-H 'Content-Type: application/json' \
-H 'Authorization: Bearer YOUR_API_KEY' \
-d '{}'
```
### Creating a template from an agent
You may have started with an agent and later decide that you'd like to convert it into a template to allow you to easily create new copies of your agent.
To convert an agent (deployed on Letta Cloud) into a template, simply open the agent in the ADE and click the "Convert to Template" button.
## Example usecase: customer service
Imagine you're creating a customer service chatbot application.
You may want every user that starts a chat sesion to get their own personalized agent:
the agent should know things specific to each user, like their purchase history, membership status, and so on.
<Frame>
```mermaid
flowchart TD
subgraph Template["Customer Service Template"]
tools["Custom Tools
--------
update_ticket_status
search_knowledge_base
escalate_ticket"]
memory["Memory Structure
---------------
name: {{name}}
ticket: {{ticket}}
spent: {{amount}}"]
end
Template --> |Deploy| user1["Alice's Agent
--------
name: Alice
ticket: T123
spent: $500"]
Template --> |Deploy| user2["Bob's Agent
--------
name: Bob
ticket: T124
spent: $750"]
Template --> |Deploy| user3["Carol's Agent
--------
name: Carol
ticket: T125
spent: $1000"]
class Template template
class user1,user2,user3 agent
```
</Frame>
However, despite being custom to individual users, each agent may share a common structure:
all agents may have access to the same tools, and the general strucutre of their memory may look the same.
For example, all customer service agents may have the `update_ticket_status` tool that allows the agent to update the status of a support ticket in your backend service.
Additionally, the agents may share a common structure to their memory block storing user information.
This is the perfect scenario to use an **agent template**!
You can take advantage of memory variables to write our user memory (one of our core memory blocks) to exploit the common structure across all users:
```handlebars
The user is contacting me to resolve a customer support issue.
Their name is {{name}} and the ticket number for this request is {{ticket}}.
They have spent ${{amount}} on the platform.
If they have spent over $700, they are a gold customer.
Gold customers get free returns and priority shipping.
```
Notice how the memory block uses variables (wrapped in `{{ }}`) to specify what part of the memory should be defined at agent creation time, vs within the template itself.
When we create an agent using this template, we can specify the values to use in place of the variables.

54
fern/pages/cloud/variables.mdx
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---
title: Memory Variables
slug: guides/templates/variables
---
<Note>
Memory variables are a feature in [agent templates](/guides/cloud/templates) (part of [Letta Cloud](/guides/cloud)).
To use memory variables, you must be using an agent template, not an agent.
</Note>
Memory variables allow you to dynamically define parts of your agent memory at the time of agent creation (when a [template](/guides/cloud/templates) is used to create a new agent).
## Defining variables in memory blocks
To use memory variables in your agent templates, you can define variables in your memory blocks by wrapping them in `{{ }}`.
For example, if you have an agent template called `customer-service-template` designed to handle customer support issues, you might have a block of memory that stores information about the user:
```handlebars
The user is contacting me to resolve a customer support issue.
Their name is {{name}} and the ticket number for this request is {{ticket}}.
```
Once variables have been defined inside of your memory block, they will dynamically appear at variables in the **ADE variables window** (click the "\{\} Variables" button at the top of the chat window to expand the dropdown).
## Simulating variable values in the ADE
<Tip>
Reset the state of the simulated agent by clicking the "Flush Simulation" 🔄 button.
</Tip>
While designing agent templates in the ADE, you can interact with a simulated agent.
The ADE variables window allows you to specify the values of the variables for the simulated agent.
You can see the current state of the simulated agent's memory by clicking the "Simulated" tab in the "Core Memory" panel in the ADE.
If you're using memory variables and do not specify values for the variables in the ADE variables window, the simulated agent will use empty values.
In this prior example, the `name` and `ticket` variables are memory variables that we will specify when we create a new agent - information that we expect to have available at that time.
While designing the agent template, we will likely want to experiment with different values for these variables to make sure that the agent is behaving as expected.
For example, if we change the name of the user from "Alice" to "Bob", the simulated agent should respond accordingly.
## Defining variables during agent creation
When we're ready to create an agent from our template, we can specify the values for the variables using the `variables` parameter in the [create agents from template endpoint](/api-reference/templates/agents/create):
```sh
curl -X POST https://app.letta.com/v1/templates/{template_name}:{template_version} \
-H 'Content-Type: application/json' \
-H 'Authorization: Bearer YOUR_API_KEY' \
-d '{
"from_template": customer-service-template:latest",
"variables": {
"name": "Bob",
"ticket": "TX-123"
}
}'
```

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fern/pages/cloud/versions.mdx
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---
title: Versioning Agent Templates
slug: guides/templates/versioning
---
<Note>
Versioning is a feature in [agent templates](/guides/cloud/templates) (part of [Letta Cloud](/guides/cloud/overview)).
To use versioning, you must be using an agent template, not an agent.
</Note>
Versions allow you to keep track of the changes you've made to your template over time.
Agent templates follow the versioning convention of `template-name:version-number`.
Similar to [Docker tags](https://docs.docker.com/get-started/docker-concepts/building-images/build-tag-and-publish-an-image/#tagging-images), you can specify the latest version of a template using the `latest` keyword (`template-name:latest`).
## Creating a new template version
When you create a template, it starts off at version 1.
Once you've make edits to your template in the ADE, you can create a new version of the template by clicking the "Template" button in the ADE (top right), then clicking "Save new template version".
Version numbers are incremented automatically (e.g. version 1 becomes version 2).
## Migrating existing agents to a new template version
If you've deployed agents on a previous version of the template, you'll be asked if you want to migrate your existing agents to the new version of the template.
When you migrate existing agents to a new template version, Letta Cloud will re-create your existing agents using the new template information, but keeping prior agent state such as the conversation history, and injecting memory variables as needed.
### When should I migrate (or not migrate) my agents?
One reason you might want to migrate your agents is if you've added new tools to your agent template: migrating existing agents to the new version of the template will give them access to the new tools, while retaining all of their prior state.
Another example usecase is if you make modifications to your prompts to tune your agent behavior - if you find a modification works well, you can save a new version with the prompt edits, and migrate all deployed agents to the new version.
### Forking an agent template
If you decide to make significant changes to your agent and would prefer to make a new template to track your changes, you can easily create a new agent template from an existing template by **forking** your template (click the settings button ⚙️ in the ADE, then click "Fork Template").
## Specifying a version when creating an agent
You can specify a template version when creating an agent in the you can use the [create agents from template endpoint](/api-reference/templates/agents/create)
For example, to deploy an agent from a template called `template-name` at version 2, you would use `:2` as the template tag:
```sh
curl -X POST https://app.letta.com/v1/templates/{template_name}:2 \
-H 'Content-Type: application/json' \
-H 'Authorization: Bearer YOUR_API_KEY' \
-d '{}'
```

2
letta/__init__.py
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@@ -5,7 +5,7 @@ try:
__version__ = version("letta")
except PackageNotFoundError:
# Fallback for development installations
__version__ = "0.16.3"
__version__ = "0.16.4"
if os.environ.get("LETTA_VERSION"):
__version__ = os.environ["LETTA_VERSION"]

2
pyproject.toml
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@@ -1,6 +1,6 @@
[project]
name = "letta"
version = "0.16.3"
version = "0.16.4"
description = "Create LLM agents with long-term memory and custom tools"
authors = [
{name = "Letta Team", email = "contact@letta.com"},

2
uv.lock generated
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@@ -2510,7 +2510,7 @@ wheels = [
[[package]]
name = "letta"
version = "0.16.2"
version = "0.16.4"
source = { editable = "." }
dependencies = [
{ name = "aiofiles" },