# GitLab CI

*/Software/GitLab_CI*

## Solution Overview

GitLab CI executes automated scripts to build, test, and deploy code changes within a Git repository. It reads a .gitlab-ci.yml configuration file at the root of a project, provisions isolated runner environments, and runs predefined stages in sequence or parallel. The system generates pass/fail status checks, build artifacts, and deployment logs directly attached to specific commits and merge requests.

Platform engineering teams and software developers configure this system to eliminate manual build and deployment routines. By enforcing automated testing and environment provisioning on every code push, it prevents broken code from reaching production and removes the need for local, inconsistent developer machine builds.

As a Headless SaaS primitive, GitLab CI sits between version control systems and cloud infrastructure providers. It consumes webhooks from Git push events and triggers downstream container registries, Kubernetes clusters, or external code review agents through its API, acting as the central execution engine for the software delivery lifecycle.

## Headless Saas Data Model

**Entities**:
- Name: Pipeline · Description: Execution of a CI/CD configuration for a specific commit
- Name: Project · Description: The repository or workspace grouping pipelines and runners
- Name: Job · Description: Individual unit of execution within a pipeline stage
- Name: Runner · Description: Provisioned environment agent that executes assigned jobs
- Name: Artifact · Description: Output files and logs generated by a completed job
**Relations**:
- To: Pipeline · From: Project · Label: triggers many · Cardinality: one-to-many
- To: Runner · From: Project · Label: registers many · Cardinality: one-to-many
- To: Job · From: Pipeline · Label: contains many · Cardinality: one-to-many
- To: Job · From: Runner · Label: executes many · Cardinality: one-to-many
- To: Artifact · From: Job · Label: generates many · Cardinality: one-to-many
**Tenant Anchor**: Project
**Primary Resource**: Pipeline

## Api Definition

**Protocols**:
- REST
- GraphQL
- CLI
- MCP
- Webhooks
**Consumed By**:
- [Release Automation Agent](/Agents/Release_Automation_Agent)
- [Code Review Agent](/Agents/Code_Review_Agent)
- [Security Triage Agent](/Agents/Security_Triage_Agent)
**Integrations**:
- [Kubernetes](/Products/Kubernetes)
- [AWS ECR](/Products/AWS_ECR)
- [Docker Hub](/Products/Docker_Hub)
- [HashiCorp Vault](/Products/HashiCorp_Vault)
**Consumption Model**: A code review agent consumes the MCP server to trigger pipelines on specific commits, subsequently calling the REST API to retrieve failure logs and test artifacts.
**Workflow Wrappers**:
- Name: Trigger Pipeline · Wraps: Parses the repository configuration, evaluates stage dependencies, and enqueues initial jobs to runners.
- Name: Retry Pipeline · Wraps: Identifies all failed jobs in a pipeline execution and re-enqueues them to available runners.
- Name: Register Runner · Wraps: Authenticates the execution environment token and connects a runner to the project job queue.

## Api Function Cascade

**Ai Role**: This Headless SaaS primitive relies entirely on deterministic code steps to orchestrate execution, operating completely straight-through with no embedded AI models or human intervention required on the primary path.
**Cascade**:
- Kind: Code · Note: Evaluates yaml configuration files for syntax and stage definitions. · Step: Parse Repository Configuration · Verb: parse · Realizes: Process System Configurations · Oversight: none
- Kind: Code · Note: Maps the directed acyclic graph based on defined stage constraints. · Step: Construct Pipeline DAG · Verb: evaluate · Realizes: Determine Execution Dependencies · Oversight: none
- Kind: Code · Note: Fetches secure environment variables natively from HashiCorp Vault. · Step: Inject Vault Secrets · Verb: retrieve · Realizes: Manage Access Credentials · Oversight: none
- Kind: Code · Note: Enqueues workloads to connected Kubernetes environments. · Step: Dispatch Runner Jobs · Verb: dispatch · Realizes: Schedule Work Items · Oversight: none
- Kind: Code · Note: Pushes compiled container images to AWS ECR or Docker Hub. · Step: Publish Build Artifacts · Verb: publish · Realizes: Maintain Software Repositories · Oversight: none
- Kind: Code · Note: Broadcasts execution status to consuming automated agents. · Step: Emit Status Webhooks · Verb: notify · Realizes: Dispatch System Notifications · Oversight: none
**Optimizes**:
- [Pipeline Execution Duration](/Metrics/Pipeline_Execution_Duration)
- [Job Failure Rate](/Metrics/Job_Failure_Rate)
- [Runner Utilization Rate](/Metrics/Runner_Utilization_Rate)
- [Continuous Integration Throughput](/Metrics/Continuous_Integration_Throughput)

## Headless Saas Representative Offer

**Warranty**: Guarantees 99.9% uptime for the API and job queuing system, providing prorated service credits if availability drops below the threshold.
**Price Band**: roughly $0.005 to $0.02 per compute minute, depending on the runner instance size and operating system
**Pricing Kind**: UsageMeter
**Deliverables**:
- On-demand pipeline execution compute
- Compiled build and test artifacts
- Pipeline execution logs and trace outputs
- Job queue access for registered custom runners
**Delivery Mode**: API-metered and self-serve, where the agent provisions pipeline executions instantly via API calls and usage is tracked per execution minute.
**Business Function**: ProvideService
**Agent Checkout Support**:
- agentic-commerce-protocol
- stored-credential

## Headless Saas Crud Surface

**Auth Model**: API Key
**Endpoints**:
- GET /pipelines — list pipelines
- POST /pipelines — trigger a new pipeline
- GET /pipelines/{id} — fetch pipeline details
- PATCH /pipelines/{id} — update pipeline status
- POST /pipelines/{id}/cancel — cancel a running pipeline
- GET /pipelines/{id}/jobs — list jobs contained in a pipeline
- GET /projects — list registered projects
- POST /projects — create a new project workspace
- GET /projects/{id} — fetch project details
- PATCH /projects/{id} — update project settings
- GET /projects/{id}/pipelines — list pipelines triggered by a project
- GET /projects/{id}/runners — list runners registered to a project
- GET /jobs — list jobs
- GET /jobs/{id} — fetch job execution details
- PATCH /jobs/{id} — update job status or stage
- POST /jobs/{id}/retry — retry a failed job
- GET /jobs/{id}/artifacts — list artifacts generated by a job
- GET /runners — list available runners
- POST /runners — provision and register a new runner
- GET /runners/{id} — fetch runner details
- PATCH /runners/{id} — update runner properties
- POST /runners/{id}/heartbeat — record an active heartbeat from a runner
- GET /runners/{id}/jobs — list jobs executed by a specific runner
- GET /artifacts — list artifacts
- POST /artifacts — register a new artifact output
- GET /artifacts/{id} — fetch artifact metadata and download URL
- PATCH /artifacts/{id} — update artifact metadata
**Multitenancy**: Row-level isolation
**Webhook Events**:
- pipeline.completed
- job.assigned
- job.failed
- runner.offline
- artifact.generated

## Headless Saas Erd

```mermaid
erDiagram
Project {
UUID id PK "tenant key"
VARCHAR name
VARCHAR repositoryUrl
VARCHAR defaultBranch
}
Pipeline {
UUID id PK
UUID projectId FK
VARCHAR commitSha
VARCHAR status
TIMESTAMP createdAt
}
Job {
UUID id PK
UUID pipelineId FK
UUID runnerId FK
VARCHAR name
VARCHAR stage
VARCHAR status
}
Runner {
UUID id PK
UUID projectId FK
VARCHAR name
BOOLEAN isOnline
TIMESTAMP lastHeartbeatAt
}
Artifact {
UUID id PK
UUID jobId FK
VARCHAR filename
DECIMAL sizeBytes
VARCHAR downloadUrl
}
Project ||--o{ Pipeline : "triggers many"
Project ||--o{ Runner : "registers many"
Pipeline ||--o{ Job : "contains many"
Runner ||--o{ Job : "executes many"
Job ||--o{ Artifact : "generates many"
```

## Neighborhood

### Related (exposed by)

- [Notify On Failure](/Action/Notify_On_Failure) — exposed by · Action
- [Get Run Result](/Action/Get_Run_Result) — exposed by · Action
- [Execute Deployment Pipeline](/Action/Execute_Deployment_Pipeline) — exposed by · Action
- [Schedule Deployment Pipeline](/Action/Schedule_Deployment_Pipeline) — exposed by · Action

### Related (uses software)

- [Network Automation Engineer](/JobTypes/Network_Automation_Engineer) — uses software · JobTypes
- [DevSecOps Engineer](/JobTypes/DevSecOps_Engineer) — uses software · JobTypes
- [Release Engineer](/JobTypes/Release_Engineer) — uses software · JobTypes

### Optimizes

- [Runner Utilization Rate](/Metrics/Runner_Utilization_Rate) — optimizes · Metrics
- [Continuous Integration Throughput](/Metrics/Continuous_Integration_Throughput) — optimizes · Metrics
- [Pipeline Execution Duration](/Metrics/Pipeline_Execution_Duration) — optimizes · Metrics
- [Job Failure Rate](/Metrics/Job_Failure_Rate) — optimizes · Metrics
- [Defect Rework Cost](/Metrics/Defect_Rework_Cost) — optimizes · Metrics
- [Capitalized Labor Accuracy](/Metrics/Capitalized_Labor_Accuracy) — optimizes · Metrics
- [Time Allocation Tracking Compliance](/Metrics/Time_Allocation_Tracking_Compliance) — optimizes · Metrics
- [Development Cost Per Product](/Metrics/Development_Cost_Per_Product) — optimizes · Metrics

### What it uses

- [Kubernetes](/Products/Kubernetes) — uses · Products
- [AWS ECR](/Products/AWS_ECR) — uses · Products
- [HashiCorp Vault](/Products/HashiCorp_Vault) — uses · Products
- [Docker Hub](/Products/Docker_Hub) — uses · Products
- [Workday](/Software/Workday) — uses · Software
- [GitHub Pull Requests](/Products/GitHub_Pull_Requests) — uses · Products
- [GitLab CI](/Products/GitLab_CI) — uses · Products
- [NetSuite](/Software/NetSuite) — uses · Software

### Who consumes this

- [Security Triage Agent](/Agents/Security_Triage_Agent) — consumed by · Agents
- [Code Review Agent](/Agents/Code_Review_Agent) — consumed by · Agents
- [Release Automation Agent](/Agents/Release_Automation_Agent) — consumed by · Agents
- [Cloud FinOps Agent](/Agents/Cloud_FinOps_Agent) — consumed by · Agents
- [R&D Controller Agent](/Agents/R&D_Controller_Agent) — consumed by · Agents
- [Capitalization Audit Agent](/Agents/Capitalization_Audit_Agent) — consumed by · Agents

### Similar Software

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- [Continuous Integration Platforms](/Metrics/Launch_Readiness_Score/Software/Continuous_Integration_Platforms) — similar · Software
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- [Automated Testing Frameworks](/Metrics/Number_of_defects_identified_per_thousand_lines_of_code_in_pre-production_quality_assurance_processes/Software/Automated_Testing_Frameworks) — similar · Software
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- [Release Orchestration Software](/Metrics/Average_time-to-market_in_days_for_all_products_(including_product_improvements_and_extensions)/Software/Release_Orchestration_Software) — similar · Software
- [GitOps Controllers](/Metrics/Deployment_Frequency/Software/GitOps_Controllers) — similar · Software
- [GitLab](/Competitors/Jira_Software/Software/GitLab) — similar · Software
- [Agile Project Management](/Metrics/Average_time-to-market_in_days_for_all_products_(including_product_improvements_and_extensions)/Software/Agile_Project_Management) — similar · Software
- [Enterprise Resource Planning](/Metrics/Development_Cost_Per_Product/Processes/Engineering_And_Coding/Problems/Defect_Rework_Cycles/Competitors/GitLab/Software/Enterprise_Resource_Planning) — similar · Software
- [Application Lifecycle Management](/Software/Application_Lifecycle_Management) — similar · Software
- [Source Code Repositories](/Metrics/Requirements_Traceability_Index/Software/Source_Code_Repositories) — similar · Software
- [GitLab CI](/Metrics/Development_Cost_Per_Product/Processes/Engineering_And_Coding/Problems/Defect_Rework_Cycles/Competitors/SonarQube/Software/GitLab_CI) — similar · Software

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### Similar Competitors

- [GitLab](/Metrics/Development_Cost_Per_Product/Processes/Engineering_And_Coding/Problems/Defect_Rework_Cycles/Competitors/GitLab) — similar · Competitors