LangSmith
LangSmith is the observability, debugging, and evaluation platform for LLM applications, built by LangChain. The LangSmith API exposes tracing, dataset management, evaluation, prompt-hub, and Fleet agent functionality for AI engineering teams.
LangSmith publishes 73 APIs on the APIs.io network, including Access Policies API, Ace API, Agents API, and 70 more. Tagged areas include Artificial Intelligence, LLM, Observability, Evaluation, and LangChain.
LangSmith’s developer surface includes authentication, documentation, pricing, engineering blog, and 7 more developer resources.
What this lets a business do 6
Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →
Kin Score
Standards implemented 1
Interfaces this provider implements that became standards by being copied rather than ratified. Each is profiled by the API Commons, and the evidence column says how the claim was established — not that it was made.
APIs 73
Individual APIs this provider publishes, each with its own machine-readable definition.
LangSmith Access Policies API
The access_policies API from LangSmith — 3 operation(s) for access_policies.
LangSmith Ace API
The ace API from LangSmith — 1 operation(s) for ace.
LangSmith Agents API
The agents API from LangSmith — 2 operation(s) for agents.
LangSmith Alert Rules API
The alert_rules API from LangSmith — 3 operation(s) for alert_rules.
LangSmith Annotation Queues API
The annotation-queues API from LangSmith — 17 operation(s) for annotation-queues.
LangSmith API Key API
The api-key API from LangSmith — 4 operation(s) for api-key.
LangSmith Audit Logs API
The audit-logs API from LangSmith — 1 operation(s) for audit-logs.
LangSmith Auth API
The auth API from LangSmith — 7 operation(s) for auth.
LangSmith Aws Marketplace API
The aws_marketplace API from LangSmith — 1 operation(s) for aws_marketplace.
LangSmith Backfills API
The backfills API from LangSmith — 1 operation(s) for backfills.
LangSmith Beacon API
The beacon API from LangSmith — 1 operation(s) for beacon.
LangSmith Bulk Exports API
The bulk-exports API from LangSmith — 7 operation(s) for bulk-exports.
LangSmith Charts API
The charts API from LangSmith — 13 operation(s) for charts.
LangSmith Comments API
The comments API from LangSmith — 3 operation(s) for comments.
LangSmith Commits API
The commits API from LangSmith — 2 operation(s) for commits.
LangSmith Data Planes API
The data_planes API from LangSmith — 1 operation(s) for data_planes.
LangSmith Datasets API
The datasets API from LangSmith — 28 operation(s) for datasets.
LangSmith Directories API
The directories API from LangSmith — 2 operation(s) for directories.
LangSmith Evaluators API
The evaluators API from LangSmith — 2 operation(s) for evaluators.
LangSmith Examples API
The examples API from LangSmith — 9 operation(s) for examples.
LangSmith Experiment View Overrides API
The experiment-view-overrides API from LangSmith — 2 operation(s) for experiment-view-overrides.
LangSmith Experiments API
The experiments API from LangSmith — 1 operation(s) for experiments.
LangSmith Features API
The features API from LangSmith — 4 operation(s) for features.
LangSmith Feedback API
The feedback API from LangSmith — 7 operation(s) for feedback.
LangSmith Feedback Configs API
The feedback-configs API from LangSmith — 1 operation(s) for feedback-configs.
LangSmith fleet auth API
The fleet auth API from LangSmith — 10 operation(s) for fleet auth.
LangSmith fleet github-app API
The fleet github-app API from LangSmith — 9 operation(s) for fleet github-app.
LangSmith fleet integrations API
The fleet integrations API from LangSmith — 3 operation(s) for fleet integrations.
LangSmith fleet mcp API
The fleet mcp API from LangSmith — 7 operation(s) for fleet mcp.
LangSmith fleet threads API
The fleet threads API from LangSmith — 5 operation(s) for fleet threads.
LangSmith fleet usage API
The fleet usage API from LangSmith — 4 operation(s) for fleet usage.
LangSmith Fleet Webhooks API
The fleet_webhooks API from LangSmith — 1 operation(s) for fleet_webhooks.
LangSmith Gateway API
The gateway API from LangSmith — 4 operation(s) for gateway.
LangSmith Gateway Policies API
The gateway-policies API from LangSmith — 2 operation(s) for gateway-policies.
LangSmith Hub Environments API
The hub_environments API from LangSmith — 2 operation(s) for hub_environments.
LangSmith Info API
The info API from LangSmith — 2 operation(s) for info.
LangSmith Integrations API
The integrations API from LangSmith — 1 operation(s) for integrations.
LangSmith Likes API
The likes API from LangSmith — 1 operation(s) for likes.
LangSmith MCP API
The mcp API from LangSmith — 2 operation(s) for mcp.
LangSmith MCP Vendors API
The mcp_vendors API from LangSmith — 6 operation(s) for mcp_vendors.
LangSmith Me API
The me API from LangSmith — 4 operation(s) for me.
LangSmith Metrics API
The metrics API from LangSmith — 1 operation(s) for metrics.
LangSmith Model Price Map API
The model-price-map API from LangSmith — 2 operation(s) for model-price-map.
LangSmith Nps API
The nps API from LangSmith — 1 operation(s) for nps.
LangSmith Ok API
The Ok API from LangSmith — 1 operation(s) for ok.
LangSmith Optimization Jobs API
The optimization-jobs API from LangSmith — 4 operation(s) for optimization-jobs.
LangSmith Organizations API
The Organizations API from LangSmith — 1 operation(s) for organizations.
LangSmith Orgs API
The orgs API from LangSmith — 39 operation(s) for orgs.
LangSmith Ownerships API
The ownerships API from LangSmith — 1 operation(s) for ownerships.
LangSmith Playground Settings API
The playground-settings API from LangSmith — 2 operation(s) for playground-settings.
LangSmith Prompt Webhooks API
The prompt-webhooks API from LangSmith — 3 operation(s) for prompt-webhooks.
LangSmith Prompts API
The prompts API from LangSmith — 2 operation(s) for prompts.
LangSmith Public API
The public API from LangSmith — 20 operation(s) for public.
LangSmith Repos API
The repos API from LangSmith — 5 operation(s) for repos.
LangSmith Run API
The run API from LangSmith — 19 operation(s) for run.
LangSmith Runs API
The runs API from LangSmith — 7 operation(s) for runs.
LangSmith Sandboxes API
The sandboxes API from LangSmith — 12 operation(s) for sandboxes.
LangSmith Sandboxes Internal API
The sandboxes-internal API from LangSmith — 1 operation(s) for sandboxes-internal.
LangSmith SCIM Tokens API
The SCIM Tokens API from LangSmith — 2 operation(s) for scim tokens.
LangSmith Service Accounts API
The service-accounts API from LangSmith — 2 operation(s) for service-accounts.
LangSmith Sessions API
The sessions API from LangSmith — 1 operation(s) for sessions.
LangSmith Settings API
The settings API from LangSmith — 2 operation(s) for settings.
LangSmith Skills API
The skills API from LangSmith — 2 operation(s) for skills.
LangSmith Tag Transitions API
The tag-transitions API from LangSmith — 1 operation(s) for tag-transitions.
LangSmith Tags API
The tags API from LangSmith — 2 operation(s) for tags.
LangSmith Tenant API
The tenant API from LangSmith — 1 operation(s) for tenant.
LangSmith Threads API
The threads API from LangSmith — 2 operation(s) for threads.
LangSmith Tools API
The tools API from LangSmith — 3 operation(s) for tools.
LangSmith Tracer Sessions API
The tracer-sessions API from LangSmith — 14 operation(s) for tracer-sessions.
LangSmith TTL Settings API
The TTL Settings API from LangSmith — 2 operation(s) for ttl settings.
LangSmith Usage Limits API
The usage-limits API from LangSmith — 3 operation(s) for usage-limits.
LangSmith Workspaces API
The workspaces API from LangSmith — 25 operation(s) for workspaces.
LangSmith OAUTH API
The oauth API from LangSmith — 8 operation(s) for oauth.
Scroll for all 73
Open Collections 75
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONLangSmith access_policies API
OPEN COLLECTIONLangSmith access_policies ace API
OPEN COLLECTIONLangSmith access_policies agents API
OPEN COLLECTIONLangSmith access_policies alert_rules API
OPEN COLLECTIONLangSmith access_policies annotation-queues API
OPEN COLLECTIONLangSmith access_policies api-key API
OPEN COLLECTIONLangSmith access_policies audit-logs API
OPEN COLLECTIONLangSmith access_policies auth API
OPEN COLLECTIONLangSmith access_policies aws_marketplace API
OPEN COLLECTIONLangSmith access_policies backfills API
OPEN COLLECTIONLangSmith access_policies beacon API
OPEN COLLECTIONLangSmith access_policies bulk-exports API
OPEN COLLECTIONLangSmith access_policies charts API
OPEN COLLECTIONLangSmith access_policies comments API
OPEN COLLECTIONLangSmith access_policies commits API
OPEN COLLECTIONLangSmith access_policies data_planes API
OPEN COLLECTIONLangSmith access_policies datasets API
OPEN COLLECTIONLangSmith access_policies directories API
OPEN COLLECTIONLangSmith access_policies evaluators API
OPEN COLLECTIONLangSmith access_policies examples API
OPEN COLLECTIONLangSmith access_policies experiment-view-overrides API
OPEN COLLECTIONLangSmith access_policies experiments API
OPEN COLLECTIONLangSmith access_policies features API
OPEN COLLECTIONLangSmith access_policies feedback API
OPEN COLLECTIONLangSmith access_policies feedback-configs API
OPEN COLLECTIONLangSmith access_policies fleet auth API
OPEN COLLECTIONLangSmith access_policies fleet github-app API
OPEN COLLECTIONLangSmith access_policies fleet integrations API
OPEN COLLECTIONLangSmith access_policies fleet mcp API
OPEN COLLECTIONLangSmith access_policies fleet threads API
OPEN COLLECTIONLangSmith access_policies fleet usage API
OPEN COLLECTIONLangSmith access_policies fleet_webhooks API
OPEN COLLECTIONLangSmith access_policies gateway API
OPEN COLLECTIONLangSmith access_policies gateway-policies API
OPEN COLLECTIONLangSmith access_policies hub_environments API
OPEN COLLECTIONLangSmith access_policies info API
OPEN COLLECTIONLangSmith access_policies integrations API
OPEN COLLECTIONLangSmith access_policies likes API
OPEN COLLECTIONLangSmith access_policies mcp API
OPEN COLLECTIONLangSmith access_policies mcp_vendors API
OPEN COLLECTIONLangSmith access_policies me API
OPEN COLLECTIONLangSmith access_policies metrics API
OPEN COLLECTIONLangSmith access_policies model-price-map API
OPEN COLLECTIONLangSmith access_policies nps API
OPEN COLLECTIONLangSmith access_policies oauth API
OPEN COLLECTIONLangSmith access_policies Ok API
OPEN COLLECTIONLangSmith access_policies optimization-jobs API
OPEN COLLECTIONLangSmith access_policies Organizations API
OPEN COLLECTIONLangSmith access_policies orgs API
OPEN COLLECTIONLangSmith access_policies ownerships API
OPEN COLLECTIONLangSmith access_policies playground-settings API
OPEN COLLECTIONLangSmith access_policies prompt-webhooks API
OPEN COLLECTIONLangSmith access_policies prompts API
OPEN COLLECTIONLangSmith access_policies public API
OPEN COLLECTIONLangSmith access_policies repos API
OPEN COLLECTIONLangSmith access_policies run API
OPEN COLLECTIONLangSmith access_policies runs API
OPEN COLLECTIONLangSmith access_policies sandboxes API
OPEN COLLECTIONLangSmith access_policies sandboxes-internal API
OPEN COLLECTIONLangSmith access_policies SCIM Tokens API
OPEN COLLECTIONLangSmith access_policies service-accounts API
OPEN COLLECTIONLangSmith access_policies sessions API
OPEN COLLECTIONLangSmith access_policies settings API
OPEN COLLECTIONLangSmith access_policies skills API
OPEN COLLECTIONLangSmith access_policies tag-transitions API
OPEN COLLECTIONLangSmith access_policies tags API
OPEN COLLECTIONLangSmith access_policies tenant API
OPEN COLLECTIONLangSmith access_policies threads API
OPEN COLLECTIONLangSmith access_policies tools API
OPEN COLLECTIONLangSmith access_policies tracer-sessions API
OPEN COLLECTIONLangSmith access_policies TTL Settings API
OPEN COLLECTIONLangSmith access_policies usage-limits API
OPEN COLLECTIONLangSmith access_policies workspaces API
OPEN COLLECTIONLangSmith
OPEN COLLECTIONScroll for all 75
Pricing Plans 2
Published pricing tiers and plan structures.
Rate Limits 1
Documented rate limits and quota policies.
Langsmith Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals for API financial operations.
Langsmith Finops
FINOPSSecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
Recommended x-agentic-access execution contracts for AI agents.
Resources
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Access & Security 2
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 1
Properties that don't map to a standard resource type
Source (apis.yml)
Work with this as data
Every provider here is available over the APIs.io API and to AI agents over MCP.