Azure Pipelines · Rate Limits

Microsoft Azure Pipelines Rate Limits

Azure DevOps Services (which hosts Azure Pipelines) applies a per-user / per-identity Throughput Service Threshold (TSTU / RCU) sliding-window rate limit. Each REST API call consumes a number of TSTUs based on cost; each user has 200 TSTUs per 5-minute sliding window. Throttled requests return HTTP 429 with Retry-After. Concurrency is capped not by API rate but by purchased parallel jobs (default 25 for Microsoft-hosted on new orgs, raise via support). Per-user TSTU limits cannot be raised — clients must throttle.

Microsoft Azure Pipelines Rate Limits is the machine-readable rate-limit profile for Azure Pipelines on the APIs.io network, in the API Commons Rate Limits shape.

It captures 5 rate-limit definitions, measuring tstu_per_5_minutes, concurrent_jobs, and minutes_per_run.

Limit state is signalled in the retryAfter, delay, limit, and remaining response headers, and an exhausted limit returns HTTP 429.

This profile was written by API Evangelist and has not been verified against a page the provider published; treat every limit as unconfirmed until a dated transcription replaces it.

The profile also includes 5 backoff/retry policies defined and response codes documented for throttled and delayedNotBlocked.

Tagged areas include Automation, Build, CI/CD, Deployment, and DevOps.

5 Limits Exhausted: HTTP 429 retryAfterdelaylimitremaining
Method: generated, dated 2026-05-05.
Written by API Evangelist on 2026-05-05 and not verified against a page the provider published. Treat every limit as unconfirmed until a dated transcription replaces it.
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AutomationBuildCI/CDDeploymentDevOpsPipelinesRate Limiting

Limits

Per-user TSTU sliding window user
tstu_per_5_minutes · minute
200
Throughput measured in Throughput Units (TSTUs). 200 per 5-minute sliding window per user. Heavy queries cost more TSTUs; light reads can cost <1.
Microsoft-hosted parallel job concurrency organization
concurrent_jobs
25
New organizations are capped at 25 Microsoft-hosted parallel jobs until a support ticket raises the limit; subject to regional capacity.
Microsoft-hosted job duration (paid) pipeline-run
minutes_per_run · minute
360
Each paid Microsoft-hosted job has a 6-hour per-run timeout.
Microsoft-hosted job duration (free private) pipeline-run
minutes_per_run · minute
60
Free private projects cap individual runs at 60 minutes.
Self-hosted job duration pipeline-run
minutes_per_run
-1
No per-run timeout on self-hosted parallel jobs.

Policies

TSTU cost weighting
API calls cost differing TSTU values based on database/CPU expense. Inexpensive reads may cost <1 TSTU; expensive list/query operations may cost 5+.
Delay before block
Before returning 429, the service may inject a delay (X-RateLimit-Delay) header to slow the client without blocking. Persistent abuse upgrades to 429.
Spread automation across identities
Build agents under PAT or service principal share the same per-identity quota; use multiple service principals to fan out automation.
Exponential backoff
Honor Retry-After. Implement exponential backoff with jitter for 429 responses.
No support increase for TSTU
Per-user TSTU limits cannot be raised by support. Design clients to respect headers and stay under limit.

Sources

Work with this as data

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

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Tools for rate limits

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curl "https://apis.io/api/v1/rate-limits/microsoft-azure-pipelines-rate-limits"
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curl "https://apis.io/api/v1/rate-limits?limit=25"

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