February 19, 2025

Project Slug Moved to Request Header

Projects are only available for Letta Cloud.

Project slug can now be specified via request header X-Project for agent creation. The existing project parameter will soon be deprecated.

Before

1 curl -X POST https://app.letta.com/v1/agents \
2   -H 'Content-Type: application/json' \
3   -H 'Authorization: Bearer YOUR_API_KEY' \
4   -d '{
5     "project":"YOUR_PROJECT_SLUG"
6     "model":"gpt-4o-mini",
7     "embedding":"openai/text-embedding-3-small"
8     "memory_blocks": [
9       {
10         "label": "human",
11         "value": "name: Caren"
12       }
13     ],
14   }'

After

1 curl -X POST https://app.letta.com/v1/agents \
2   -H 'Content-Type: application/json' \
3   -H 'Authorization: Bearer YOUR_API_KEY' \
4   -H 'X-Project: YOUR_PROJECT_SLUG' \
5   -d '{
6     "model":"gpt-4o-mini",
7     "embedding":"openai/text-embedding-3-small"
8     "memory_blocks": [
9       {
10         "label": "human",
11         "value": "name: Caren"
12       }
13     ],
14   }'