Pipeline

Pipeline Skill

Overview

The pipeline skill enables chaining multiple agents together in defined workflows where the output of one agent becomes the input to the next. This creates powerful agent pipelines similar to Unix pipes but designed for AI agent orchestration.

Core Concepts

1. Sequential Pipelines

The simplest form: Agent A's output flows to Agent B, which flows to Agent C.

explore -> architect -> executor

Flow:

1. Explore agent searches codebase and produces findings
2. Architect receives findings and produces analysis/recommendations
3. Executor receives recommendations and implements changes

2. Branching Pipelines

Route to different agents based on output conditions.

explore -> {
  if "complex refactoring" -> architect -> executor-high
  if "simple change" -> executor-low
  if "UI work" -> designer -> executor
}

3. Parallel-Then-Merge Pipelines

Run multiple agents in parallel, merge their outputs.

parallel(explore, researcher) -> architect -> executor

Built-in Pipeline Presets

Review Pipeline

Purpose: Comprehensive code review and implementation

/pipeline review <task>

Stages:

1. explore - Find relevant code and patterns
2. architect - Analyze architecture and design implications
3. critic - Review and critique the analysis
4. executor - Implement with full context

Use for: Major features, refactorings, complex changes

Implement Pipeline

Purpose: Planned implementation with testing

/pipeline implement <task>

Stages:

1. planner - Create detailed implementation plan
2. executor - Implement the plan
3. tdd-guide - Add/verify tests

Use for: New features with clear requirements

Debug Pipeline

Purpose: Systematic debugging workflow

/pipeline debug <issue>

Stages:

1. explore - Locate error locations and related code
2. architect - Analyze root cause
3. build-fixer - Apply fixes and verify

Use for: Bugs, build errors, test failures

Research Pipeline

Purpose: External research + internal analysis

/pipeline research <topic>

Stages:

1. parallel(researcher, explore) - External docs + internal code
2. architect - Synthesize findings
3. writer - Document recommendations

Use for: Technology decisions, API integrations

Refactor Pipeline

Purpose: Safe, verified refactoring

/pipeline refactor <target>

Stages:

1. explore - Find all usages and dependencies
2. architect-medium - Design refactoring strategy
3. executor-high - Execute refactoring
4. qa-tester - Verify no regressions

Use for: Architectural changes, API redesigns

Security Pipeline

Purpose: Security audit and fixes

/pipeline security <scope>

Stages:

1. explore - Find potential vulnerabilities
2. security-reviewer - Audit and identify issues
3. executor - Implement fixes
4. security-reviewer-low - Re-verify

Use for: Security reviews, vulnerability fixes

Custom Pipeline Syntax

Basic Sequential

/pipeline agent1 -> agent2 -> agent3 "task description"

Example:

/pipeline explore -> architect -> executor "add authentication"

With Model Specification

/pipeline explore:haiku -> architect:opus -> executor:sonnet "optimize performance"

With Branching

/pipeline explore -> (
  complexity:high -> architect:opus -> executor-high:opus
  complexity:medium -> executor:sonnet
  complexity:low -> executor-low:haiku
) "fix reported issues"

With Parallel Stages

/pipeline [explore, researcher] -> architect -> executor "implement OAuth"

Data Passing Protocol

Each agent in the pipeline receives structured context from the previous stage:

{
  "pipeline_context": {
    "original_task": "user's original request",
    "previous_stages": [
      {
        "agent": "explore",
        "model": "haiku",
        "findings": "...",
        "files_identified": ["src/auth.ts", "src/user.ts"]
      }
    ],
    "current_stage": "architect",
    "next_stage": "executor"
  },
  "task": "specific task for this agent"
}

Error Handling

Retry Logic

When an agent fails, the pipeline can:

1. Retry - Re-run the same agent (up to 3 times)
2. Skip - Continue to next stage with partial output
3. Abort - Stop entire pipeline
4. Fallback - Route to alternative agent

Configuration:

/pipeline explore -> architect -> executor --retry=3 --on-error=abort

Error Recovery Patterns

Pattern 1: Fallback to Higher Tier

executor-low -> on-error -> executor:sonnet

Pattern 2: Consult Architect

executor -> on-error -> architect -> executor

Pattern 3: Human-in-the-Loop

any-stage -> on-error -> pause-for-user-input

Pipeline State Management

Pipelines maintain state in .omc/pipeline-state.json:

{
  "pipeline_id": "uuid",
  "name": "review",
  "active": true,
  "current_stage": 2,
  "stages": [
    {
      "name": "explore",
      "agent": "explore",
      "model": "haiku",
      "status": "completed",
      "output": "..."
    },
    {
      "name": "architect",
      "agent": "architect",
      "model": "opus",
      "status": "in_progress",
      "started_at": "2026-01-23T10:30:00Z"
    },
    {
      "name": "executor",
      "agent": "executor",
      "model": "sonnet",
      "status": "pending"
    }
  ],
  "task": "original user task",
  "created_at": "2026-01-23T10:25:00Z"
}

Verification Rules

Before pipeline completion, verify:

• All stages completed successfully
• Output from final stage addresses original task
• No unhandled errors in any stage
• All files modified pass lsp_diagnostics
• Tests pass (if applicable)

Advanced Features

Conditional Branching

Based on agent output, route to different paths:

explore -> {
  if files_found > 5 -> architect:opus -> executor-high:opus
  if files_found <= 5 -> executor:sonnet
}

Loop Constructs

Repeat stages until condition met:

repeat_until(tests_pass) {
  executor -> qa-tester
}

Merge Strategies

When parallel agents complete:

• concat: Concatenate all outputs
• summarize: Use architect to summarize findings
• vote: Use critic to choose best output

Usage Examples

Example 1: Feature Implementation

/pipeline review "add rate limiting to API"

→ Triggers: explore → architect → critic → executor

Example 2: Bug Fix

/pipeline debug "login fails with OAuth"

→ Triggers: explore → architect → build-fixer

Example 3: Custom Chain

/pipeline explore:haiku -> architect:opus -> executor:sonnet -> tdd-guide:sonnet "refactor auth module"

Example 4: Research-Driven Implementation

/pipeline research "implement GraphQL subscriptions"

→ Triggers: parallel(researcher, explore) → architect → writer

Cancellation

Stop active pipeline:

/pipeline cancel

Or use the general cancel command which detects active pipeline.

Integration with Other Skills

Pipelines can be used within other skills:

• Ralph: Loop pipelines until verified complete
• Ultrawork: Run multiple pipelines in parallel
• Autopilot: Use pipelines as building blocks

Best Practices

1. Start with presets - Use built-in pipelines before creating custom ones
2. Match model to complexity - Don't waste opus on simple tasks
3. Keep stages focused - Each agent should have one clear responsibility
4. Use parallel stages - Run independent work simultaneously
5. Verify at checkpoints - Use architect or critic to verify progress
6. Document custom pipelines - Save successful patterns for reuse

Troubleshooting

Pipeline Hangs

Check: .omc/pipeline-state.json for current stage Fix: Resume with /pipeline resume or cancel and restart

Agent Fails Repeatedly

Check: Retry count and error messages Fix: Route to higher-tier agent or add architect consultation

Output Not Flowing

Check: Data passing structure in agent prompts Fix: Ensure each agent is prompted with pipeline_context

Technical Implementation

The pipeline orchestrator:

1. Parses pipeline definition - Validates syntax and agent names
2. Initializes state - Creates pipeline-state.json
3. Executes stages sequentially - Spawns agents with Task tool
4. Passes context between stages - Structures output for next agent
5. Handles branching logic - Evaluates conditions and routes
6. Manages parallel execution - Spawns concurrent agents and merges
7. Persists state - Updates state file after each stage
8. Enforces verification - Runs checks before completion

STATE CLEANUP ON COMPLETION

IMPORTANT: Delete state files on completion - do NOT just set active: false

When pipeline completes (all stages done or cancelled):

# Delete pipeline state file
rm -f .omc/state/pipeline-state.json

This ensures clean state for future sessions. Stale state files with active: false should not be left behind.

Skill Invocation

This skill activates when:

• User types /pipeline command
• User mentions "agent chain", "workflow", "pipe agents"
• Pattern detected: "X then Y then Z" with agent names

Explicit invocation:

/oh-my-gemini:pipeline review "task"

Auto-detection:

"First explore the codebase, then architect should analyze it, then executor implements"

→ Automatically creates pipeline: explore → architect → executor