
MCP Client Features: Sampling, Elicitation and Roots Explained
MCP sampling, elicitation and roots explained against the 2026-07-28 spec, with JSON-RPC examples and which of 24 clients support each one.
424 articles

Langfuse is part of ClickHouse, Promptfoo is part of OpenAI, Galileo is part of Cisco, Traceloop is joining ServiceNow, Helicone joined Mintlify and Humanloop shut down. Who owns what in October 2026, the dates the vendors state, and a portability checklist built on OTLP ingest, licenses and self-hosting.

MCP sampling, elicitation and roots explained against the 2026-07-28 spec, with JSON-RPC examples and which of 24 clients support each one.

GPT-Live can now call the Decisions API itself, mid-sentence. How native delegation and transcript triggers work, the session config, and the events to handle.

Agent memory is five layers: history, compaction, semantic recall, working memory and files. How Mastra, LangGraph, OpenAI and Claude implement each.

How to start ChatGPT Work tasks from Gmail, Slack, GitHub and your own MCP server events: setup steps, the 30-runs-per-hour cap and signed webhook code.

Ten agent frameworks, one decision guide: a capability matrix built from official docs and a flowchart that picks by language, durability and team.

What changed in the Claude Agent SDK by October 2026: nested subagents with caps, SessionStore, skills, plugins, structured outputs and permission defaults.

Claude Code v2.1.277+ reads AGENTS.md when a repo has no CLAUDE.md. How the four Project instructions modes work, the settings key, and the gotchas.

Claude Code starts in auto mode by default, with its safety classifier moving server-side. How to keep, tune or turn it off, and the v2.1.302 headless catch.

Claude computer use is GA as computer_toolset_20260801: no beta header, batched actions, zoom on. How to call it, migrate, and write an SDK driver.

Claude Files API and Skills API are GA: drop two beta headers, add file expiry up to 90 days, and switch to page cursors. Type-checked TS and Python steps.

Claude Managed Agents can now write workflows that fan out up to 1,000 agents server-side. How to enable workflow runs, follow events and cap spend.

Codex Cloud reusable environments: publish once, then start isolated tasks from web, desktop or mobile. Setup, secrets, CLI, limits and 8-16 GiB VMs.
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