> ## Documentation Index
> Fetch the complete documentation index at: https://docs.reply.io/llms.txt
> Use this file to discover all available pages before exploring further.
# List messages in an inbox thread
> _Requires the `inbox:read` scope (or a broader one that includes it)._
Returns a paginated page of messages on the given thread, ordered by `date` ascending. Messages are polymorphic: `channel: email` carries recipient and subject metadata, `channel: linkedIn` carries only the shared base fields.
## OpenAPI
````yaml /api-reference/bundled.yaml get /v3/inbox/threads/{id}/messages
openapi: 3.1.0
info:
version: 3.0.0
title: Reply API
description: API for managing email sequences, contacts, and automation workflows
servers:
- url: https://api.reply.io
security:
- bearerAuth: []
tags:
- name: User Account
description: Account information and authentication verification
- name: Accounts
description: Manage accounts (companies/organizations)
- name: AI SDR Insights
description: Read AI SDR insights for sequence contacts
- name: AI SDR Intent Signals
description: >-
Read Reply industry IDs and technology slugs used in AI SDR intent-signal
configuration (typeahead)
- name: AI SDR Sequences
description: >-
Manage AI SDR sequences and their AI SDR-specific settings — create, read
settings, partial update, autopilot enable/disable/force-start, approval
mode, generated step types, and playbook/knowledge-base connections
- name: AI SDR Web Search
description: Find contacts via AI-driven web search and review past searches
- name: Attachments
description: >-
Upload file attachments used across email templates, sequence steps, and
direct emails
- name: Account Lists
description: Manage account lists and account membership
- name: Background Jobs
description: >-
Track and cancel asynchronous background operations (e.g., email
validation)
- name: Custom Fields
description: Manage custom contact fields
- name: Direct Outreach
description: >-
Send one-off outreach directly to a contact outside of any sequence —
direct emails and LinkedIn connection requests, messages, InMails, and
voice messages
- name: Contact Blacklist Rules
description: Manage blacklist rules for domains, emails, and email exceptions
- name: Contact Enrichment
description: >-
Enrich contacts with emails, phone numbers, LinkedIn data, and AI-filled
custom fields
- name: Contact Lists
description: Manage contact lists and contact membership
- name: Contacts
description: Manage individual contacts
- name: Email Accounts
description: Manage email accounts used for sending and receiving
- name: Email Templates
description: Manage email templates and template folders
- name: Email Validations
description: Estimate and schedule asynchronous email validation jobs
- name: Holiday Calendars
description: Manage holiday calendars for scheduling
- name: Inbox
description: >-
Manage inbox threads and per-team thread categories — list/filter, read
state, replies, category assignment, and meeting-intent flagging
- name: LinkedIn Accounts
description: Manage LinkedIn accounts for outreach
- name: Live Data
description: >-
Find new contacts via Live Data searches and read typeahead values for the
Live Data / Autopilot filter sidebar
- name: AI SDR Knowledge Bases
description: >-
Manage AI SDR knowledge bases — collections of documents, links, reply
handlers, and reengagement cards that inform the agent's responses
- name: AI SDR Offers
description: >-
Manage AI SDR offers — bundles of company-context inputs (ICP, pain
points, value propositions, etc.) used to personalize outreach
- name: AI SDR Pending Approvals
description: >-
Review, send, regenerate, and provide feedback on AI-generated messages
awaiting human approval
- name: AI SDR Playbooks
description: >-
Manage AI SDR playbooks — tone, voice, and style guides applied during
personalized message generation
- name: Reports
description: >-
Generate and access performance reports across email, calls, tasks,
LinkedIn, and team performance
- name: Schedules
description: Manage email send schedules and timing
- name: Settings
description: Manage team and user settings
- name: Sequence Contacts
description: Manage contacts within sequences
- name: Sequence Email Accounts
description: Manage email accounts linked to sequences
- name: Sequence Folders
description: Organize sequences into folders
- name: Sequence LinkedIn Accounts
description: Manage LinkedIn accounts linked to sequences
- name: AI SDR Sequence Preview
description: >-
Read and regenerate per-contact previews of the messages a sequence will
send, and provide feedback on preview messages
- name: Sequence Steps
description: Manage individual steps in sequences
- name: Sequence Templates
description: Manage sequence templates
- name: Sequences
description: Manage email automation sequences
- name: AI SDR Strategist
description: Trigger AI Strategist runs
- name: Tasks
description: Manage tasks and to-do items
- name: Webhooks
description: Manage webhook subscriptions and inspect delivery history
paths:
/v3/inbox/threads/{id}/messages:
get:
tags:
- Inbox
summary: List messages in an inbox thread
description: >-
_Requires the `inbox:read` scope (or a broader one that includes
it)._
Returns a paginated page of messages on the given thread, ordered by
`date` ascending. Messages are polymorphic: `channel: email` carries
recipient and subject metadata, `channel: linkedIn` carries only the
shared base fields.
operationId: ListInboxThreadMessages
parameters:
- in: path
name: id
required: true
schema:
type: integer
minimum: 1
- in: query
name: top
schema:
type: integer
minimum: 1
maximum: 1000
description: >-
Maximum items to return. Defaults to the server-side default page
size when omitted.
- in: query
name: skip
schema:
type: integer
minimum: 0
description: Items to skip from the start of the result set.
responses:
'200':
description: Thread messages page
content:
application/json:
schema:
type: object
required:
- items
- hasMore
properties:
items:
type: array
items:
title: Inbox Thread Message
description: >-
Polymorphic message variant within an inbox thread,
discriminated by `channel`. Email messages carry
recipient and subject metadata; LinkedIn messages carry
only the shared base fields.
discriminator:
propertyName: channel
mapping:
email:
$ref: '#/components/schemas/email.type-2'
linkedIn:
$ref: '#/components/schemas/linkedin.type-2'
oneOf:
- type: object
title: Inbox Email Message
description: Email message within an inbox thread.
required:
- channel
properties:
channel:
type: string
enum:
- email
description: Discriminator — always `email` for this variant.
date:
type: string
format: date-time
body:
type: string
nullable: true
description: Message body. May contain HTML.
fromName:
type: string
nullable: true
isOutbound:
type: boolean
description: >-
True when the message was sent from this
account; false when received.
status:
type: object
allOf:
- type: object
title: Inbox Thread Message Status
description: >-
Per-message status. Populated for outbound
messages that surfaced a delivery error;
absent (`null`) on healthy inbound or
successfully delivered outbound messages.
properties:
state:
type: string
enum:
- ok
- needsAttention
description: >-
Message state, parallel to the thread
state.
code:
type: string
nullable: true
enum:
- linkedInAccountNotEnabled
- linkedInInvalidCookie
- linkedInSendingLimitExceeded
- linkedInMessageSendingDisabled
- >-
linkedInSalesNavigatorSubscriptionMissing
- linkedInMessageTooLong
- linkedInRenderFailed
- linkedInUnknown
- linkedInProfileNotConnected
description: >-
Specific delivery error that put the
message into `needsAttention`. `null`
for healthy messages.
occurredAt:
type: string
format: date-time
nullable: true
description: >-
Timestamp of the most recent status
transition.
nullable: true
aiSentType:
type: string
nullable: true
enum:
- aiGenerated
- aiGeneratedEdited
- autoSent
description: >-
For a sent message, identifies that it was
generated by AI. `null` when the message was not
AI-generated.
subject:
type: string
nullable: true
fromAddress:
type: string
nullable: true
to:
type: array
nullable: true
items:
type: string
cc:
type: array
nullable: true
items:
type: string
bcc:
type: array
nullable: true
items:
type: string
- type: object
title: Inbox LinkedIn Message
description: LinkedIn message within an inbox thread.
required:
- channel
properties:
channel:
type: string
enum:
- linkedIn
description: >-
Discriminator — always `linkedIn` for this
variant.
date:
type: string
format: date-time
body:
type: string
nullable: true
fromName:
type: string
nullable: true
isOutbound:
type: boolean
status:
type: object
allOf:
- type: object
title: Inbox Thread Message Status
description: >-
Per-message status. Populated for outbound
messages that surfaced a delivery error;
absent (`null`) on healthy inbound or
successfully delivered outbound messages.
properties:
state:
type: string
enum:
- ok
- needsAttention
description: >-
Message state, parallel to the thread
state.
code:
type: string
nullable: true
enum:
- linkedInAccountNotEnabled
- linkedInInvalidCookie
- linkedInSendingLimitExceeded
- linkedInMessageSendingDisabled
- >-
linkedInSalesNavigatorSubscriptionMissing
- linkedInMessageTooLong
- linkedInRenderFailed
- linkedInUnknown
- linkedInProfileNotConnected
description: >-
Specific delivery error that put the
message into `needsAttention`. `null`
for healthy messages.
occurredAt:
type: string
format: date-time
nullable: true
description: >-
Timestamp of the most recent status
transition.
nullable: true
aiSentType:
type: string
nullable: true
enum:
- aiGenerated
- aiGeneratedEdited
- autoSent
description: >-
For a sent message, identifies that it was
generated by AI. `null` when the message was not
AI-generated.
hasMore:
type: boolean
examples:
email_thread:
summary: Two-message email exchange
value:
items:
- channel: email
date: '2026-05-06T08:01:42Z'
body: >-
Hi Daria — quick check-in on the Q3 rollout pricing
we discussed last week. Are you free Tuesday at 10am
for a 20-min call?
fromName: Alex Johnson
isOutbound: true
subject: Pricing for Q3 rollout
fromAddress: alex.johnson@reply.example
to:
- daria.kovalenko@northwind.example
cc: null
bcc: null
- channel: email
date: '2026-05-07T14:32:11Z'
body: >-
Thanks — does Tuesday at 10am work for a quick
call?
Daria
fromName: Daria Kovalenko
isOutbound: false
subject: 'Re: Pricing for Q3 rollout'
fromAddress: daria.kovalenko@northwind.example
to:
- alex.johnson@reply.example
cc: null
bcc: null
hasMore: false
linkedin_thread_with_send_failure:
summary: >-
LinkedIn thread where the latest outbound message hit a
delivery error — the message-level `status` carries the
failure code.
value:
items:
- channel: linkedIn
date: '2026-05-05T11:22:00Z'
body: >-
Thanks for connecting — would you be open to a 15 min
chat about how teams use Lattice for pipeline
reporting?
fromName: Priya Subramaniam
isOutbound: false
- channel: linkedIn
date: '2026-05-06T07:04:51Z'
body: Hi Priya — sure, would Thursday afternoon work?
fromName: Alex Johnson
isOutbound: true
status:
state: needsAttention
code: linkedInInvalidCookie
occurredAt: '2026-05-06T07:04:53Z'
hasMore: false
'400':
description: >-
Route validation failure, or a business-rule rejection (e.g. invalid
pagination, invalid input).
content:
application/problem+json:
schema:
oneOf:
- allOf:
- allOf:
- type: object
title: Problem Details
description: >-
Bare RFC 9457 problem-details envelope. Returned
by middleware-level errors
that don't carry domain context: 401 Unauthorized
(auth middleware),
429 Too Many Requests (rate-limit middleware), and
route-level 404 / 405 /
415 (framework middleware).
Business and validation responses extend this
envelope and add additional
fields — see `business-problem.model.yaml` (adds
`code` slug) and
`validation-problem.model.yaml` (adds `errors[]`
array).
properties:
title:
type: string
description: Short, human-readable summary of the problem.
status:
type: integer
description: HTTP status code.
minimum: 100
maximum: 599
detail:
type: string
description: >-
Human-readable explanation specific to this
occurrence.
- type: object
properties:
errors:
type: array
description: >-
List of field-level validation errors. Always
non-empty when this
envelope is returned. Each entry pins a single
offending field
via JSON Pointer plus a sanitized detail
string.
items:
type: object
title: Validation Error
description: A single field-level validation error.
properties:
pointer:
type: string
description: >-
JSON Pointer (RFC 6901) to the offending
field — e.g.
`/steps/0/subject`.
* An empty string (`""`) means the error
applies to the whole
request body (e.g. body is missing or unparseable).
* For route or query parameter failures
the pointer is the parameter
name (e.g. `id`, `top`).
example: /steps/0/subject
detail:
type: string
description: >-
Sanitized, human-readable explanation of
this field's error. One of a
small set of templates — `"Field is
required."`, `"Value has an
invalid type."`, `"Value has an invalid
format."`, `"Request body is
not valid JSON."`, `"The request body is
required and cannot be
empty."` — or a FluentValidator message
on body endpoints.
example: Field is required.
title: Validation Problem
description: >-
Input-validation error response at 400. Returned when
the request body
fails binding, FluentValidator rules, or when
route/query parameter
attribute validation (`[Range]`, `[Required]`) fails.
Route, query, and
body errors are combined into a single `errors[]`
array — clients should
not assume one error per request.
- example:
title: Validation failed
status: 400
detail: The request body contains validation errors.
errors:
- pointer: /name
detail: Field is required.
- allOf:
- allOf:
- type: object
title: Problem Details
description: >-
Bare RFC 9457 problem-details envelope. Returned
by middleware-level errors
that don't carry domain context: 401 Unauthorized
(auth middleware),
429 Too Many Requests (rate-limit middleware), and
route-level 404 / 405 /
415 (framework middleware).
Business and validation responses extend this
envelope and add additional
fields — see `business-problem.model.yaml` (adds
`code` slug) and
`validation-problem.model.yaml` (adds `errors[]`
array).
properties:
title:
type: string
description: Short, human-readable summary of the problem.
status:
type: integer
description: HTTP status code.
minimum: 100
maximum: 599
detail:
type: string
description: >-
Human-readable explanation specific to this
occurrence.
- type: object
properties:
code:
type: string
description: >-
Stable, machine-readable error slug in the
form
`"."`.
* `resource` is the camelCased domain — e.g.
`sequence`,
`contact`, `inboxThread`, `blacklistDomainRule`.
* `variant` is the camelCased specific failure
mode — e.g.
`notFound`, `forbidden`, `duplicateName`, `globalRuleReadOnly`.
Use `code` for programmatic error handling;
use `detail` for
user-facing messages. Slugs are stable across
server-side enum
reorderings and never change meaning under a
given resource.
pattern: ^[a-z][a-zA-Z0-9]*(\.[a-z][a-zA-Z0-9]*)+$
example: sequence.notFound
title: Business Problem
description: >-
Domain error response carrying a stable, namespaced
error slug.
Emitted for most 4xx responses (business 400, 403,
404, 409, …) and
for 503 when a downstream dependency is unavailable.
- example:
title: Bad Request
status: 400
detail: Pagination parameters are invalid.
code: sequence.invalidPagination
examples:
validation_failed:
summary: Route parameter validation failure
value:
title: Validation failed
status: 400
detail: The request contains validation errors.
errors:
- pointer: id
detail: '''id'' must be a positive integer.'
business_invalid_pagination:
summary: Invalid pagination
value:
title: Bad Request
status: 400
detail: Invalid pagination parameters.
code: inboxThread.invalidPagination
'401':
description: >-
Unauthorized. The response body is empty; check the
`WWW-Authenticate` header for the expected scheme.
content:
application/problem+json:
schema:
allOf:
- type: object
title: Problem Details
description: >-
Bare RFC 9457 problem-details envelope. Returned by
middleware-level errors
that don't carry domain context: 401 Unauthorized (auth
middleware),
429 Too Many Requests (rate-limit middleware), and
route-level 404 / 405 /
415 (framework middleware).
Business and validation responses extend this envelope and
add additional
fields — see `business-problem.model.yaml` (adds `code`
slug) and
`validation-problem.model.yaml` (adds `errors[]` array).
properties:
title:
type: string
description: Short, human-readable summary of the problem.
status:
type: integer
description: HTTP status code.
minimum: 100
maximum: 599
detail:
type: string
description: >-
Human-readable explanation specific to this
occurrence.
- example:
title: Unauthorized
status: 401
detail: Authentication credentials are missing or invalid.
'403':
description: Inbox feature is not available for this user or team.
content:
application/problem+json:
schema:
allOf:
- allOf:
- type: object
title: Problem Details
description: >-
Bare RFC 9457 problem-details envelope. Returned by
middleware-level errors
that don't carry domain context: 401 Unauthorized
(auth middleware),
429 Too Many Requests (rate-limit middleware), and
route-level 404 / 405 /
415 (framework middleware).
Business and validation responses extend this envelope
and add additional
fields — see `business-problem.model.yaml` (adds
`code` slug) and
`validation-problem.model.yaml` (adds `errors[]`
array).
properties:
title:
type: string
description: Short, human-readable summary of the problem.
status:
type: integer
description: HTTP status code.
minimum: 100
maximum: 599
detail:
type: string
description: >-
Human-readable explanation specific to this
occurrence.
- type: object
properties:
code:
type: string
description: >-
Stable, machine-readable error slug in the form
`"."`.
* `resource` is the camelCased domain — e.g.
`sequence`,
`contact`, `inboxThread`, `blacklistDomainRule`.
* `variant` is the camelCased specific failure
mode — e.g.
`notFound`, `forbidden`, `duplicateName`, `globalRuleReadOnly`.
Use `code` for programmatic error handling; use
`detail` for
user-facing messages. Slugs are stable across
server-side enum
reorderings and never change meaning under a given
resource.
pattern: ^[a-z][a-zA-Z0-9]*(\.[a-z][a-zA-Z0-9]*)+$
example: sequence.notFound
title: Business Problem
description: >-
Domain error response carrying a stable, namespaced error
slug.
Emitted for most 4xx responses (business 400, 403, 404,
409, …) and
for 503 when a downstream dependency is unavailable.
- example:
title: Forbidden
status: 403
detail: You do not have permission to access this resource.
code: sequence.forbidden
example:
title: Forbidden
status: 403
detail: Inbox feature is not available for this user.
code: inboxThread.forbidden
'404':
description: Thread not found or not visible to the current user.
content:
application/problem+json:
schema:
allOf:
- allOf:
- type: object
title: Problem Details
description: >-
Bare RFC 9457 problem-details envelope. Returned by
middleware-level errors
that don't carry domain context: 401 Unauthorized
(auth middleware),
429 Too Many Requests (rate-limit middleware), and
route-level 404 / 405 /
415 (framework middleware).
Business and validation responses extend this envelope
and add additional
fields — see `business-problem.model.yaml` (adds
`code` slug) and
`validation-problem.model.yaml` (adds `errors[]`
array).
properties:
title:
type: string
description: Short, human-readable summary of the problem.
status:
type: integer
description: HTTP status code.
minimum: 100
maximum: 599
detail:
type: string
description: >-
Human-readable explanation specific to this
occurrence.
- type: object
properties:
code:
type: string
description: >-
Stable, machine-readable error slug in the form
`"."`.
* `resource` is the camelCased domain — e.g.
`sequence`,
`contact`, `inboxThread`, `blacklistDomainRule`.
* `variant` is the camelCased specific failure
mode — e.g.
`notFound`, `forbidden`, `duplicateName`, `globalRuleReadOnly`.
Use `code` for programmatic error handling; use
`detail` for
user-facing messages. Slugs are stable across
server-side enum
reorderings and never change meaning under a given
resource.
pattern: ^[a-z][a-zA-Z0-9]*(\.[a-z][a-zA-Z0-9]*)+$
example: sequence.notFound
title: Business Problem
description: >-
Domain error response carrying a stable, namespaced error
slug.
Emitted for most 4xx responses (business 400, 403, 404,
409, …) and
for 503 when a downstream dependency is unavailable.
- example:
title: Not Found
status: 404
detail: The requested resource was not found.
code: sequence.notFound
example:
title: Not Found
status: 404
detail: Inbox thread not found.
code: inboxThread.notFound
'429':
description: Too Many Requests
headers:
Retry-After:
description: Seconds to wait before retrying
schema:
type: integer
minimum: 1
content:
application/problem+json:
schema:
allOf:
- type: object
title: Problem Details
description: >-
Bare RFC 9457 problem-details envelope. Returned by
middleware-level errors
that don't carry domain context: 401 Unauthorized (auth
middleware),
429 Too Many Requests (rate-limit middleware), and
route-level 404 / 405 /
415 (framework middleware).
Business and validation responses extend this envelope and
add additional
fields — see `business-problem.model.yaml` (adds `code`
slug) and
`validation-problem.model.yaml` (adds `errors[]` array).
properties:
title:
type: string
description: Short, human-readable summary of the problem.
status:
type: integer
description: HTTP status code.
minimum: 100
maximum: 599
detail:
type: string
description: >-
Human-readable explanation specific to this
occurrence.
example:
title: Too Many Requests
status: 429
detail: Rate limit exceeded. Retry after 60 seconds.
components:
schemas:
email.type-2:
type: object
title: Inbox Email Message
description: Email message within an inbox thread.
required:
- channel
properties:
channel:
type: string
enum:
- email
description: Discriminator — always `email` for this variant.
date:
type: string
format: date-time
body:
type: string
nullable: true
description: Message body. May contain HTML.
fromName:
type: string
nullable: true
isOutbound:
type: boolean
description: >-
True when the message was sent from this account; false when
received.
status:
type: object
allOf:
- type: object
title: Inbox Thread Message Status
description: >-
Per-message status. Populated for outbound messages that
surfaced a delivery error; absent (`null`) on healthy inbound or
successfully delivered outbound messages.
properties:
state:
type: string
enum:
- ok
- needsAttention
description: Message state, parallel to the thread state.
code:
type: string
nullable: true
enum:
- linkedInAccountNotEnabled
- linkedInInvalidCookie
- linkedInSendingLimitExceeded
- linkedInMessageSendingDisabled
- linkedInSalesNavigatorSubscriptionMissing
- linkedInMessageTooLong
- linkedInRenderFailed
- linkedInUnknown
- linkedInProfileNotConnected
description: >-
Specific delivery error that put the message into
`needsAttention`. `null` for healthy messages.
occurredAt:
type: string
format: date-time
nullable: true
description: Timestamp of the most recent status transition.
nullable: true
aiSentType:
type: string
nullable: true
enum:
- aiGenerated
- aiGeneratedEdited
- autoSent
description: >-
For a sent message, identifies that it was generated by AI. `null`
when the message was not AI-generated.
subject:
type: string
nullable: true
fromAddress:
type: string
nullable: true
to:
type: array
nullable: true
items:
type: string
cc:
type: array
nullable: true
items:
type: string
bcc:
type: array
nullable: true
items:
type: string
linkedin.type-2:
type: object
title: Inbox LinkedIn Message
description: LinkedIn message within an inbox thread.
required:
- channel
properties:
channel:
type: string
enum:
- linkedIn
description: Discriminator — always `linkedIn` for this variant.
date:
type: string
format: date-time
body:
type: string
nullable: true
fromName:
type: string
nullable: true
isOutbound:
type: boolean
status:
type: object
allOf:
- type: object
title: Inbox Thread Message Status
description: >-
Per-message status. Populated for outbound messages that
surfaced a delivery error; absent (`null`) on healthy inbound or
successfully delivered outbound messages.
properties:
state:
type: string
enum:
- ok
- needsAttention
description: Message state, parallel to the thread state.
code:
type: string
nullable: true
enum:
- linkedInAccountNotEnabled
- linkedInInvalidCookie
- linkedInSendingLimitExceeded
- linkedInMessageSendingDisabled
- linkedInSalesNavigatorSubscriptionMissing
- linkedInMessageTooLong
- linkedInRenderFailed
- linkedInUnknown
- linkedInProfileNotConnected
description: >-
Specific delivery error that put the message into
`needsAttention`. `null` for healthy messages.
occurredAt:
type: string
format: date-time
nullable: true
description: Timestamp of the most recent status transition.
nullable: true
aiSentType:
type: string
nullable: true
enum:
- aiGenerated
- aiGeneratedEdited
- autoSent
description: >-
For a sent message, identifies that it was generated by AI. `null`
when the message was not AI-generated.
securitySchemes:
bearerAuth:
type: http
scheme: bearer
description: >-
Authenticate every request with a Bearer token. Pass your Reply API key
in the
`Authorization` header:
```
Authorization: Bearer
```
Get your API key from the Reply dashboard: **Settings → API Key**.
````