Sierra website screenshot

Sierra

Sierra is an enterprise conversational AI platform co-founded by Bret Taylor that builds and operates customer-facing AI agents across chat, SMS, WhatsApp, email, voice, and ChatGPT. Its Agent OS includes Agent Studio for building agents, Ghostwriter for agent generation from SOPs and transcripts, Insights for analytics, an Agent Data Platform for personalization, Voice Agents, and Live Assist for human handoff. Sierra is enterprise sales-led with no self-serve public developer API; integrations and Agent SDK access are provisioned through customer engagements.

Sierra publishes 1 API on the APIs.io network. Tagged areas include Agents, Artificial Intelligence, Chat, Conversational AI, and Customer Experience.

Sierra’s developer surface includes engineering blog, pricing, support, developer portal, documentation, and 15 more developer resources.

23.6/100 emerging ▬ flat Agent 3/100 human only saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0
AccessFree
1 APIs 6 Features 3 Use Cases
AgentsArtificial IntelligenceChatConversational AICustomer ExperienceCustomer ServiceEnterpriseVoice

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0
Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/sierra: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Sierra Agent OS

Sierra Agent OS is the enterprise platform for building, deploying, and operating customer-facing AI agents. It includes Agent Studio, Ghostwriter, Insights, the Agent Data Plat...

Pricing Plans 1

Published pricing tiers and plan structures.

Sierra Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Sierra Rate Limits

2 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Features 6

Notable capabilities this provider offers.

Agent Studio

Dashboard for building, configuring, optimizing, and managing customer-facing AI agents.

Ghostwriter

Agent-building agent that generates production-ready agents from SOPs, transcripts, or plain English descriptions.

Insights

Analytics suite covering conversation Explorer, proactive Monitors, multivariate Experiments, and tool-call Observability.

Agent Data Platform

Integrates customer context, conversation history, and data warehouses for personalization.

Voice Agents

AI agents deployable across voice, chat, SMS, WhatsApp, email, and ChatGPT channels.

Live Assist

Seamless escalation and human-in-the-loop handoff from AI agents to live customer service reps.

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Sierra Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Sierra Vulnerability Disclosure

Hackerone · security.txt · contact published

SECURITY

Sierra Trust Center

PCI DSS, HIPAA

SECURITY

Use Cases 3

What developers build with this provider.

Customer Service Automation

Resolve customer support inquiries autonomously across channels.

Voice IVR Replacement

Replace traditional IVR with natural conversational voice agents.

Subscription Retention

Reduce subscription cancellations through proactive agent engagement.

Integrations 5

Pre-built integrations with other platforms and tools.

Google Cloud

Data connectivity and infrastructure partner.

Databricks

Data warehouse and ML platform connector for agent context.

Snowflake

Data warehouse connector for the Agent Data Platform.

Redis

Real-time data and cache integration.

AWS

Cloud infrastructure and data connector.

Solutions 7

Packaged solutions this provider offers.

Financial Services

Vertical solution for banks, fintechs, and lenders with compliance tooling and case templates.

Healthcare

HIPAA-aligned deployments for payers, providers, and digital health.

Telecommunications

Carrier-grade agents for plan changes, troubleshooting, and retention.

Media and Subscriptions

Subscription lifecycle and content support.

Travel and Hospitality

Booking, itinerary changes, and concierge experiences (Woodside Collection).

Retail

Pre-purchase, post-purchase, and loyalty agents.

Technology

Developer tools and SaaS support workflows.

Scroll for all 7

Resources

Get Started 2

Portal, sign-up, and the first successful call

Documentation 1

Reference material describing how the API behaves

Build 1

SDKs, sample code, and the tooling you integrate with

Access & Security 4

Authentication, authorization, and security posture

Operate 2

Status, limits, changes, and where to get help

Commercial 3

Pricing, plans, and the legal terms of use

Company 4

The organization behind the API

Other 5

Properties that don't map to a standard resource type

Source (apis.yml)

apis.yml Raw ↑
aid: sierra
name: Sierra
description: Sierra is an enterprise conversational AI platform co-founded by Bret Taylor that builds and operates customer-facing
  AI agents across chat, SMS, WhatsApp, email, voice, and ChatGPT. Its Agent OS includes Agent Studio for building agents,
  Ghostwriter for agent generation from SOPs and transcripts, Insights for analytics, an Agent Data Platform for personalization,
  Voice Agents, and Live Assist for human handoff. Sierra is enterprise sales-led with no self-serve public developer API;
  integrations and Agent SDK access are provisioned through customer engagements.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: free
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Free
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/sierra.png
url: https://raw.githubusercontent.com/api-evangelist/sierra/refs/heads/main/apis.yml
created: '2026-05-23'
modified: '2026-08-08'
specificationVersion: '0.23'
type: Index
access: 3rd-Party
position: Producing
tags:
- Agents
- Artificial Intelligence
- Chat
- Conversational AI
- Customer Experience
- Customer Service
- Enterprise
- Voice
tags_raw:
- Agents
- AI
- Chat
- Conversational AI
- Customer Experience
- Customer Service
- Enterprise
- Voice
apis:
- aid: sierra:agent-os
  name: Sierra Agent OS
  description: Sierra Agent OS is the enterprise platform for building, deploying, and operating customer-facing AI agents.
    It includes Agent Studio, Ghostwriter, Insights, the Agent Data Platform, Voice Agents, and Live Assist. Sierra references
    an Agent SDK in product materials but does not publish a public API reference; access is provisioned through enterprise
    engagement.
  humanURL: https://sierra.ai/platform
  tags:
  - Agents
  - Conversational AI
  - Enterprise
  - SDK
  - Voice
  properties:
  - type: Documentation
    url: https://sierra.ai/platform
common:
- type: TrustCenter
  url: security/sierra-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/sierra-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/sierra-domain-security.yml
- type: Website
  url: https://sierra.ai
- type: Blog
  url: https://sierra.ai/blog
- type: Customers
  url: https://sierra.ai/customers
- type: Pricing
  url: https://sierra.ai/contact
- type: TermsOfService
  url: https://sierra.ai/legal/terms-of-service
- type: PrivacyPolicy
  url: https://sierra.ai/legal/privacy-policy
- type: Support
  url: https://sierra.ai/contact
- type: GitHubOrganization
  url: https://github.com/sierra-ai
- type: LinkedIn
  url: https://www.linkedin.com/company/sierra-ai
- type: Login
  url: https://app.sierra.ai
- type: Features
  data:
  - name: Agent Studio
    description: Dashboard for building, configuring, optimizing, and managing customer-facing AI agents.
  - name: Ghostwriter
    description: Agent-building agent that generates production-ready agents from SOPs, transcripts, or plain English descriptions.
  - name: Insights
    description: Analytics suite covering conversation Explorer, proactive Monitors, multivariate Experiments, and tool-call
      Observability.
  - name: Agent Data Platform
    description: Integrates customer context, conversation history, and data warehouses for personalization.
  - name: Voice Agents
    description: AI agents deployable across voice, chat, SMS, WhatsApp, email, and ChatGPT channels.
  - name: Live Assist
    description: Seamless escalation and human-in-the-loop handoff from AI agents to live customer service reps.
- type: UseCases
  data:
  - name: Customer Service Automation
    description: Resolve customer support inquiries autonomously across channels.
  - name: Voice IVR Replacement
    description: Replace traditional IVR with natural conversational voice agents.
  - name: Subscription Retention
    description: Reduce subscription cancellations through proactive agent engagement.
- type: Customers
  data:
  - name: Rocket Mortgage
  - name: SoFi
  - name: Chime
  - name: Brex
  - name: Gap Inc.
  - name: SiriusXM
  - name: Wayfair
  - name: Sutter Health
  - name: Discord
  - name: Redfin
  - name: Rivian
  - name: ADT
  - name: CLEAR
  - name: Singtel
  - name: Tubi
- type: Integrations
  data:
  - name: Google Cloud
    description: Data connectivity and infrastructure partner.
  - name: Databricks
    description: Data warehouse and ML platform connector for agent context.
  - name: Snowflake
    description: Data warehouse connector for the Agent Data Platform.
  - name: Redis
    description: Real-time data and cache integration.
  - name: AWS
    description: Cloud infrastructure and data connector.
- type: Compliance
  data:
  - name: SOC 2
  - name: ISO 27001
  - name: ISO 42001
  - name: HIPAA
  - name: GDPR
  - name: EU AI Act
- type: Portal
  url: https://sierra.ai
- type: Documentation
  url: https://docs.sierra.ai
- type: Resources
  url: https://sierra.ai/resources
- type: Careers
  url: https://sierra.ai/careers
- type: Contact
  url: https://sierra.ai/contact
- type: Events
  url: https://sierra.ai/summit
- type: X
  url: https://twitter.com/sierraplatform
- type: Solutions
  data:
  - name: Financial Services
    description: Vertical solution for banks, fintechs, and lenders with compliance tooling and case templates.
  - name: Healthcare
    description: HIPAA-aligned deployments for payers, providers, and digital health.
  - name: Telecommunications
    description: Carrier-grade agents for plan changes, troubleshooting, and retention.
  - name: Media and Subscriptions
    description: Subscription lifecycle and content support.
  - name: Travel and Hospitality
    description: Booking, itinerary changes, and concierge experiences (Woodside Collection).
  - name: Retail
    description: Pre-purchase, post-purchase, and loyalty agents.
  - name: Technology
    description: Developer tools and SaaS support workflows.
  url: ''
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
  url: https://apievangelist.com
x-merged-from:
- sierra-ai

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this
  • find_providersBrowse and filter every provider in the catalog.
  • get_provider_artifactsEvery artifact this provider publishes, grouped by type.
  • get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
  • get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
  • get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
  • get_provider_ratingPRO — composite, band, trend and facet scores.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This provider
curl "https://apis.io/api/v1/providers/sierra"
All providers
curl "https://apis.io/api/v1/providers?limit=25"
Every operation they expose
curl "https://apis.io/api/v1/providers/sierra/operations?limit=25"
How their score was established
curl "https://apis.io/api/v1/providers/sierra/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

A second provider on the same verified email joins the account you already have.