This release introduces new capabilities for connecting Cellm to external systems and improves underlying integrations with model providers.

What's New

• Add support for Model Context Protocol (MCP): You can now connect Cellm to MCP-compatible servers, allowing your Excel sheets to interact with external data sources or trigger actions via Cellm functions. Effectively, it turns Excel into a low-code automation tool, enabling workflows orchestrated directly from your spreadsheet. We're still trying to wrap our head around the possibilities this unlocks. They are freakin' endless.
• Adopt Anthropic.SDK for Anthropic Calls: Previously, we rolled our own custom Anthropic client because of the lack of an official SDK. We've migrated our Anthropic integration to the community-driven Anthropic.SDK (github.com/tghamm/Anthropic.SDK). This decision was driven by Anthropic's adoption of this SDK for their official .NET MCP library. This move ensures better standardization, aligns Cellm with Microsoft.Extensions.AI patterns, and leverages ongoing community improvements.
• Telemetry: To help us identify bug and understand usage patterns, we now send anonymized crash reports and model interaction details to Sentry. We never capture any data from your spreadsheet. Still, you can opt out of this at any time by adding the following to your appsettings.Local.json:

{
    "SentryConfiguration": {
        "IsEnabled": false
    }
}

Bug fixes

• Fixed a regression that inadvertently broke the use of tools with AI models.
• Adjusted the prompt caching mechanism to correctly invalidate the cache when tools are added or removed.
• Tuned the default settings for the rate limiter (Retry and Circuit Breaker policies) to work together more effectively during periods of high activity. These defaults prioritize stability and avoiding upstream provider rate limits. You can always crank up the limits or remove them altogether, but aggressive settings may lead to more errors from the AI provider.

What's Changed

• Merge develop into main by @kaspermarstal in https://github.com/getcellm/cellm/pull/129
• fix: Prompts involving tool calls would return the tool call message, not the assistant's reply to the tool call result by @kaspermarstal in https://github.com/getcellm/cellm/pull/130
• build: Update Microsoft.Extensions.AI version to 9.4.0-preview.1.25207.5 by @MackinnonBuck in https://github.com/getcellm/cellm/pull/133
• Merge dev by @kaspermarstal in https://github.com/getcellm/cellm/pull/136
• build: Update dependencies by @kaspermarstal in https://github.com/getcellm/cellm/pull/138
• fix: Retry on broken circuit and Anthropic's rate limits exceeded, guarantee first retry waits until opened circuit is closed, and reduce aggresiveness of circuit breaker by @kaspermarstal in https://github.com/getcellm/cellm/pull/140
• fix: Adding/removing tools did not invalidate cache by @kaspermarstal in https://github.com/getcellm/cellm/pull/139
• refactor: Sentry PipelineBehavior by @kaspermarstal in https://github.com/getcellm/cellm/pull/137
• fix: Sentry transaction contexts by @kaspermarstal in https://github.com/getcellm/cellm/pull/142
• build: Bump version by @kaspermarstal in https://github.com/getcellm/cellm/pull/143

New Contributors

• @MackinnonBuck made their first contribution in https://github.com/getcellm/cellm/pull/133

Full Changelog: https://github.com/getcellm/cellm/compare/v0.2.0...v0.3.0