Mods Catalog

Harness modifications let agents adapt through code.

Install with letta install <source>

Official mods are maintained by Letta. Community mods are owner-maintained. All mods run as local code, so review the source before installing.

Retired packages are omitted from this list. Existing npm releases remain installable with letta install npm:<package>, but receive no new Letta releases. See the retirement records for original ownership and replacements.

Featured

Selected for broad utility.

Plan Mode

• Type: official, featured
• Author: carenthomas55
• Duration: 2 months ago
• Package: npm:@letta-ai/plan-mode
• Description: Letta Code mod package that adds plan mode.
• Commands/Events: tools, events, turns, permissions
• Links: npm repo

Web Search

• Type: official, featured
• Author: carenthomas77
• Duration: 2 months ago
• Package: npm:@letta-ai/web-search
• Description: Letta Code mod package that adds provider-backed web search tools using agent-scoped secrets.
• Links: npm repo

MemFS Search

• Type: official, featured
• Author: just-cameron83
• Duration: 1 month ago
• Package: npm:@letta-ai/memfs-search
• Description: Letta Code mod package that adds an agent-callable MemFS memory search tool.
• Links: npm repo

Image Understanding

• Type: official, featured
• Author: just-cameron37
• Duration: 2 months ago
• Package: npm:@letta-ai/image-understanding
• Description: Letta Code mod package that adds image understanding for text-only agents using a separate vision backend.
• Links: npm repo

Oath Keeper

• Type: community
• Author: coda-rho-bot367
• Duration: 1 month ago
• Package: npm:@coda-rho-bot/oath-keeper
• Description: Passively detects when agents make follow-up promises and automatically delivers on them. Cron is for things you plan. Oath Keeper is for things you promise.
• Links: npm repo

Retitle Conversation

• Type: official
• Author: just-cameron122
• Duration: 25 days ago
• Package: npm:@letta-ai/retitle-conversation
• Description: Letta Code mod package that lets agents update the current conversation title.
• Links: npm repo

letta-provider-umans

• Type: community
• Author: nina87
• Duration: 1 month ago
• Package: npm:letta-provider-umans
• Description: Umans.ai provider for Letta Code — subscription-based access to coding-optimized models.
• Links: npm repo

@letta-ai/model-profiles

• Type: official
• Author: just-cameron83
• Duration: 6 days ago
• Package: npm:@letta-ai/model-profiles
• Description: Letta Code mod package for managing per-model context window and reasoning effort profiles in MemFS.
• Links: npm repo