[Docs] Add missing MCP per-user token env vars to config_settings

[yuneng-berri]

Summary

MCP_PER_USER_TOKEN_DEFAULT_TTL and MCP_PER_USER_TOKEN_EXPIRY_BUFFER_SECONDS were introduced in #25441 but not added to the environment variables reference doc, causing test_env_keys.py to fail on all PRs branched from main after that merge.

Changes

Added both env vars to the environment variables - Reference table in docs/my-website/docs/proxy/config_settings.md, grouped with the existing MCP OAuth entries.

Testing

Ran poetry run python ./tests/documentation_tests/test_env_keys.py locally — passes.

Type

📖 Documentation

[vercel]

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Project	Deployment	Actions	Updated (UTC)
litellm	Ready	Preview, Comment	Apr 10, 2026 4:06am

[greptile-apps]

Greptile Summary

This PR adds two missing environment variables (MCP_PER_USER_TOKEN_DEFAULT_TTL and MCP_PER_USER_TOKEN_EXPIRY_BUFFER_SECONDS) to the proxy config settings reference docs, fixing a test_env_keys.py regression introduced when they were implemented in #25441 without a corresponding docs entry. The documented defaults (43200 and 60) accurately match the values in litellm/constants.py.

Confidence Score: 5/5

Safe to merge — documentation-only fix with accurate defaults, unblocks CI on dependent PRs.

The change is two documentation lines with values verified against the source constants. No logic, security, or schema concerns.

No files require special attention.

Important Files Changed

Filename	Overview
docs/my-website/docs/proxy/config_settings.md	Added two MCP per-user token env var entries with correct defaults, grouped logically with existing MCP OAuth settings.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[MCP Per-User OAuth Token Request] --> B{expires_in present?}
    B -- Yes --> C[TTL = expires_in - MCP_PER_USER_TOKEN_EXPIRY_BUFFER_SECONDS\ndefault buffer: 60s]
    B -- No --> D[TTL = MCP_PER_USER_TOKEN_DEFAULT_TTL\ndefault: 43200s / 12 hours]
    C --> E[Store token in Redis with computed TTL]
    D --> E

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[codspeed-hq]

Merging this PR will not alter performance

✅ 16 untouched benchmarks

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_{Comparing litellm_doc_mcp_per_user_token_env_vars (ce0b57b) with main (aa0fa10)}