---
title: "Introspect Endpoint"
method: POST
path: "/introspect"
tags: ["mcp_discoverable"]
---

# Introspect Endpoint

`POST /introspect`

RFC 7662 introspection for gateway-issued session tokens (``llm_session_`` /
``llm_srefresh_``), so an external gateway can validate them without the signing
secret. The caller authenticates with a LiteLLM virtual key (section 2.1, enforced by
the route dependency); any token the gateway cannot vouch for answers
``{"active": false}`` with no further detail.

## Response `200`

Successful Response

- unknown

## Other responses

- `422` — Validation Error

## Changes

- **2026-09-20** `3b2b241e4b0b` — 2 info
  - api tag `mcp_discoverable` added
  - api tag `mcp` removed
- **2026-09-18** `082b5fabd909` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/flock/apis/litellm-api/changes/introspect/post.md)

---

[API](https://skmtc.dev/flock/apis/litellm-api.md) · [All operations](https://skmtc.dev/flock/apis/litellm-api/llms.txt) · [OpenAPI document](https://skmtc.dev/flock/apis/litellm-api/revisions/3b2b241e4b0b?raw)