docs(mcp): document MCP server variables and credential store - #357
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Add CLAUDE.md with guidelines for public-facing communication to maintain consistent, less formal tone across documentation, PRs, and comments. Focus on clarity and conciseness while avoiding common AI-like patterns such as excessive emoji use, em dashes, and verbose list formatting. Update docs/mcp.md authentication section to clarify per-user credential scenarios and simplify guidance for when to use variable substitution with static headers.
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Summary
Adds documentation for the MCP server variables / credential store feature shipped in v1.89.0 (PR #28917). The v1.89.0 release notes announced the feature but
docs/mcp.mdhad no coverage of it.Adds a "Server Variables" subsection to
docs/mcp.md(under the UI tab, alongside Static Headers) explaining named variables, the${VAR_NAME}substitution syntax in static headers and authentication, and the difference between Instance (shared) and Per-user scopes.Test plan