---
title: "Mark Agent Session Read"
method: PUT
path: "/agent/sessions/{session_id}/read"
tags: ["Agents"]
---

# Mark Agent Session Read

`PUT /agent/sessions/{session_id}/read`

## Request

- Base URL: `https://be.graph8.com/api/v1`
- URL: `https://be.graph8.com/api/v1/agent/sessions/{session_id}/read`
- Auth: HTTP bearer

Mark messages read up to a COUNT, not a flag.

A count higher than the session actually holds is refused with 409 rather
than accepted. That looks strict until you consider what accepting it does:
a stale client claiming to have read eleven messages when there are nine
would mark the next two read before anyone saw them, and the customer would
never be told the agent had replied.

The app answers 204 with no body; this returns the usual envelope so a
generated SDK has one response shape across the surface.

## Path parameters

- `session_id` string, required: Session id (UUID).

## Headers

- `Authorization` string, nullable
- `X-Target-Org-Id` string, nullable

## Request body

- SessionReadRequest: Mirror of `SessionReadRequest`.
  - `message_count` integer, required: How many messages the caller has actually seen. NOT a flag: the server refuses a count higher than the session holds with a 409, because a client claiming to have read messages that do not exist yet is a stale client, and silently accepting it would mark a later real message read before anyone saw it.

## Response `200`

Successful Response

- ApiResponseAgentSessionStatePayload
  - `data` AgentSessionStatePayload, required: An open envelope for a hydration or voice answer. Open because session hydration returns the agent's STEPS as well as its messages, and a step's `detail` is whatever the tool that produced it reported. That set grows with every tool the platform gains, and a pinned mirror would drop the detail of exactly the newest ones - which on a transcript surface reads as the agent having done less than it did.
  - `pagination` PaginationMeta
    - `page` integer, required: Current page number (1-indexed)
    - `limit` integer, required: Items per page
    - `total` integer, required: Total number of items
    - `has_next` boolean, required: Whether there are more pages
    - `next_cursor` string, nullable: Opaque cursor for the next page; null when there are no more items. Pass it back as the `cursor` query param to fetch the following page without computing page numbers.
    - `total_available` integer, nullable: Search endpoints only: how many records really match, when known. Can be larger than `total`, which is capped at the 10,000 results that can be paged. For company search this is a distinct-company estimate. Null when unknown; absent outside search.
    - `total_is_lower_bound` boolean, nullable: Search endpoints only: true when more records match than `total` shows (the result set is larger than the 10,000 results that can be paged). Absent outside search.
    - `notes` string[], nullable: Search endpoints only: plain-language notes about the result, e.g. that more records match than can be paged, or that a reversed `between` range was put in order.

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/graph8/apis/graph8-developer-api.md) · [All operations](https://skmtc.dev/graph8/apis/graph8-developer-api/llms.txt) · [OpenAPI document](https://skmtc.dev/graph8/apis/graph8-developer-api/revisions/2e7cfa0ca921?raw)