Understanding MCP clients changeddocs/2026-07-28/learn/client-concepts
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Upstream edited this page at 20 Oct 2026 20:02 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 20 Oct 2026 20:07 UTC.
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113113
114114### Roots
115115
116<Warning>
117 Roots are [deprecated](/specification/2026-07-28/deprecated) as of protocol
118 version `2026-07-28` and scheduled for removal. New implementations should
119 pass directories or files via tool parameters, resource URIs, or server
120 configuration instead.
121</Warning>
116> [!WARNING]
117>
118> Roots are [deprecated](/specification/2026-07-28/deprecated) as of protocol
119> version `2026-07-28` and scheduled for removal. New implementations should
120> pass directories or files via tool parameters, resource URIs, or server
121> configuration instead.
122122
123123Roots define filesystem boundaries for server operations, allowing clients to specify which directories servers should focus on.
124124
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169169
170170### Sampling
171171
172<Warning>
173 Sampling is [deprecated](/specification/2026-07-28/deprecated) as of protocol
174 version `2026-07-28` and scheduled for removal. New implementations should
175 integrate directly with LLM provider APIs instead.
176</Warning>
172> [!WARNING]
173>
174> Sampling is [deprecated](/specification/2026-07-28/deprecated) as of protocol
175> version `2026-07-28` and scheduled for removal. New implementations should
176> integrate directly with LLM provider APIs instead.
177177
178178Sampling allows servers to request language model completions through the client, enabling agentic behaviors while maintaining security and user control.
179179
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