feat(everything): add trigger-agentic-sampling tool #3163
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Adds a new tool that demonstrates sampling with tools capability (MCP 2025-11-25). The tool sends prompts to the LLM with tools available, handles tool_use responses in an agentic loop, and executes tools locally until a final response is received. 🦉 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <[email protected]>
Update features.md and structure.md to document the new trigger-agentic-sampling tool. Also adds missing documentation for trigger-elicitation-request. 🦉 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <[email protected]>
cliffhall
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Jan 5, 2026
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Can't test with the Inspector yet (saw your mention of an issue with the SDK on that), but review did turn up a few minor things.
Address PR review feedback: remove console.log statements that would interfere with STDIO JSON-RPC output. Registration now silently skips when client doesn't support sampling.tools (matching other conditional tools). Remaining debug logs changed to console.error. Co-Authored-By: Claude Opus 4.5 <[email protected]>
Match the pattern used by other conditional tools: wrap registerTool
in `if (clientSupports...) { }` instead of early return.
Co-Authored-By: Claude Opus 4.5 <[email protected]>
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Description
Adds support for SEP-1577 (Sampling With Tools) to the Everything server by introducing a new
trigger-agentic-samplingtool that demonstrates the agentic sampling loop pattern.This tool:
tool_useresponses and executes tools locallysampling.toolscapabilityServer Details
Motivation and Context
Issue: #3040
SEP-1577 adds tool calling support to the MCP sampling API, enabling servers to provide tools that the LLM can use during sampling requests. This creates an "agentic loop" where:
sampling/createMessagewith atoolsarraystopReason: "toolUse", the server executes the toolsThe Everything server is a reference implementation that demonstrates all MCP features, so it should include this capability.
How Has This Been Tested?
sampling.toolscapability checktrigger-sampling-request,trigger-elicitation-request)(We can wait to merge until I've had a chance to add a screengrab if that's preferred.)
Breaking Changes
No
Types of changes
Checklist
Additional context
References
Implementation Notes
The tool includes simple local implementations of
echoandaddtools for demonstration purposes. In a production scenario, tools could likely be reused via:server.server.callTool()callsI thought about trying to re-use existing tools already defined in the everything server, but then decided to keep it self-contained instead.