docs: add Needlepath context selection guardrail page

[kirankashalkar]

Draft, paired with BerriAI/litellm#36504. We are keeping both in draft pending our own upstream validation, and will mark them ready for review shortly.

Adds the documentation page for the needlepath guardrail introduced in BerriAI/litellm#36504, plus its sidebars.js entry.

The page covers:

• what selection does: query-conditioned extractive selection of the spans that carry the answer, with nothing paraphrased or rewritten
• how the query is derived per message, from the tool call's intent or the last user message
• the full config surface, top-level and nested optional_params, with defaults
• the fail-open behaviour, stated as a feature: every decline path and what the client gets in each case
• what is not covered today, including /v1/responses and mixed text and non-text content parts

No performance, accuracy, or compression-ratio numbers are claimed anywhere on the page. It is deliberately mechanism-only and limited to behaviour that is observable on the wire.

Files:

• docs/proxy/guardrails/needlepath.md (new)
• sidebars.js (one line, alphabetical position in the guardrails list)

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Project	Deployment	Actions	Updated (UTC)
litellm	Ready	Preview	Aug 11, 2026 3:16am