msd-core/docs/AGENTS.md

GSD Agent Reference

All 15 specialized agents — roles, tools, spawn patterns, and relationships. For architecture context, see Architecture.

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Overview

GSD uses a multi-agent architecture where thin orchestrators (workflow files) spawn specialized agents with fresh context windows. Each agent has a focused role, limited tool access, and produces specific artifacts.

Agent Categories

Category	Count	Agents
Researchers	3	project-researcher, phase-researcher, ui-researcher
Synthesizers	1	research-synthesizer
Planners	1	planner
Roadmappers	1	roadmapper
Executors	1	executor
Checkers	3	plan-checker, integration-checker, ui-checker
Verifiers	1	verifier
Auditors	2	nyquist-auditor, ui-auditor
Mappers	1	codebase-mapper
Debuggers	1	debugger

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Agent Details

gsd-project-researcher

Role: Researches domain ecosystem before roadmap creation.

Property	Value
Spawned by	/gsd:new-project, /gsd:new-milestone
Parallelism	4 instances (stack, features, architecture, pitfalls)
Tools	Read, Write, Bash, Grep, Glob, WebSearch, WebFetch, mcp (context7)
Model (balanced)	Sonnet
Produces	.planning/research/STACK.md, FEATURES.md, ARCHITECTURE.md, PITFALLS.md

Capabilities:

• Web search for current ecosystem information
• Context7 MCP integration for library documentation
• Writes research documents directly to disk (reduces orchestrator context load)

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gsd-phase-researcher

Role: Researches how to implement a specific phase before planning.

Property	Value
Spawned by	/gsd:plan-phase
Parallelism	4 instances (same focus areas as project researcher)
Tools	Read, Write, Bash, Grep, Glob, WebSearch, WebFetch, mcp (context7)
Model (balanced)	Sonnet
Produces	{phase}-RESEARCH.md

Capabilities:

• Reads CONTEXT.md to focus research on user's decisions
• Investigates implementation patterns for the specific phase domain
• Detects test infrastructure for Nyquist validation mapping

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gsd-ui-researcher

Role: Produces UI design contracts for frontend phases.

Property	Value
Spawned by	/gsd:ui-phase
Parallelism	Single instance
Tools	Read, Write, Bash, Grep, Glob, WebSearch, WebFetch, mcp (context7)
Model (balanced)	Sonnet
Color	#E879F9 (fuchsia)
Produces	{phase}-UI-SPEC.md

Capabilities:

• Detects design system state (shadcn components.json, Tailwind config, existing tokens)
• Offers shadcn initialization for React/Next.js/Vite projects
• Asks only unanswered design contract questions
• Enforces registry safety gate for third-party components

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gsd-research-synthesizer

Role: Combines outputs from parallel researchers into a unified summary.

Property	Value
Spawned by	/gsd:new-project (after 4 researchers complete)
Parallelism	Single instance (sequential after researchers)
Tools	Read, Write, Bash
Model (balanced)	Sonnet
Color	Purple
Produces	.planning/research/SUMMARY.md

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gsd-planner

Role: Creates executable phase plans with task breakdown, dependency analysis, and goal-backward verification.

Property	Value
Spawned by	/gsd:plan-phase, /gsd:quick
Parallelism	Single instance
Tools	Read, Write, Bash, Glob, Grep, WebFetch, mcp (context7)
Model (balanced)	Opus
Color	Green
Produces	{phase}-{N}-PLAN.md files

Key behaviors:

• Reads PROJECT.md, REQUIREMENTS.md, CONTEXT.md, RESEARCH.md
• Creates 2-3 atomic task plans sized for single context windows
• Uses XML structure with <task> elements
• Includes read_first and acceptance_criteria sections
• Groups plans into dependency waves

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gsd-roadmapper

Role: Creates project roadmaps with phase breakdown and requirement mapping.

Property	Value
Spawned by	/gsd:new-project
Parallelism	Single instance
Tools	Read, Write, Bash, Glob, Grep
Model (balanced)	Sonnet
Color	Purple
Produces	ROADMAP.md

Key behaviors:

• Maps requirements to phases (traceability)
• Derives success criteria from requirements
• Respects granularity setting for phase count
• Validates coverage (every v1 requirement mapped to a phase)

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gsd-executor

Role: Executes GSD plans with atomic commits, deviation handling, and checkpoint protocols.

Property	Value
Spawned by	/gsd:execute-phase, /gsd:quick
Parallelism	Multiple (parallel within waves, sequential across waves)
Tools	Read, Write, Edit, Bash, Grep, Glob
Model (balanced)	Sonnet
Color	Yellow
Produces	Code changes, git commits, {phase}-{N}-SUMMARY.md

Key behaviors:

• Fresh 200K context window per plan
• Follows XML task instructions precisely
• Atomic git commit per completed task
• Handles checkpoint types: auto, human-verify, decision, human-action
• Reports deviations from plan in SUMMARY.md
• Invokes node repair on verification failure

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gsd-plan-checker

Role: Verifies plans will achieve phase goals before execution.

Property	Value
Spawned by	/gsd:plan-phase (verification loop, max 3 iterations)
Parallelism	Single instance (iterative)
Tools	Read, Bash, Glob, Grep
Model (balanced)	Sonnet
Color	Green
Produces	PASS/FAIL verdict with specific feedback

8 Verification Dimensions:

1. Requirement coverage
2. Task atomicity
3. Dependency ordering
4. File scope
5. Verification commands
6. Context fit
7. Gap detection
8. Nyquist compliance (when enabled)

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gsd-integration-checker

Role: Verifies cross-phase integration and end-to-end flows.

Property	Value
Spawned by	/gsd:audit-milestone
Parallelism	Single instance
Tools	Read, Bash, Grep, Glob
Model (balanced)	Sonnet
Color	Blue
Produces	Integration verification report

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gsd-ui-checker

Role: Validates UI-SPEC.md design contracts against quality dimensions.

Property	Value
Spawned by	/gsd:ui-phase (validation loop, max 2 iterations)
Parallelism	Single instance
Tools	Read, Bash, Glob, Grep
Model (balanced)	Sonnet
Color	#22D3EE (cyan)
Produces	BLOCK/FLAG/PASS verdict

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gsd-verifier

Role: Verifies phase goal achievement through goal-backward analysis.

Property	Value
Spawned by	/gsd:execute-phase (after all executors complete)
Parallelism	Single instance
Tools	Read, Write, Bash, Grep, Glob
Model (balanced)	Sonnet
Color	Green
Produces	{phase}-VERIFICATION.md

Key behaviors:

• Checks codebase against phase goals, not just task completion
• PASS/FAIL with specific evidence
• Logs issues for /gsd:verify-work to address

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gsd-nyquist-auditor

Role: Fills Nyquist validation gaps by generating tests.

Property	Value
Spawned by	/gsd:validate-phase
Parallelism	Single instance
Tools	Read, Write, Edit, Bash, Grep, Glob
Model (balanced)	Sonnet
Produces	Test files, updated VALIDATION.md

Key behaviors:

• Never modifies implementation code — only test files
• Max 3 attempts per gap
• Flags implementation bugs as escalations for user

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gsd-ui-auditor

Role: Retroactive 6-pillar visual audit of implemented frontend code.

Property	Value
Spawned by	/gsd:ui-review
Parallelism	Single instance
Tools	Read, Write, Bash, Grep, Glob
Model (balanced)	Sonnet
Color	#F472B6 (pink)
Produces	{phase}-UI-REVIEW.md with scores

6 Audit Pillars (scored 1-4):

1. Copywriting
2. Visuals
3. Color
4. Typography
5. Spacing
6. Experience Design

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gsd-codebase-mapper

Role: Explores codebase and writes structured analysis documents.

Property	Value
Spawned by	/gsd:map-codebase
Parallelism	4 instances (tech, architecture, quality, concerns)
Tools	Read, Bash, Grep, Glob, Write
Model (balanced)	Haiku
Color	Cyan
Produces	.planning/codebase/*.md (7 documents)

Key behaviors:

• Read-only exploration + structured output
• Writes documents directly to disk
• No reasoning required — pattern extraction from file contents

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gsd-debugger

Role: Investigates bugs using scientific method with persistent state.

Property	Value
Spawned by	/gsd:debug, /gsd:verify-work (for failures)
Parallelism	Single instance (interactive)
Tools	Read, Write, Edit, Bash, Grep, Glob, WebSearch
Model (balanced)	Sonnet
Color	Orange
Produces	.planning/debug/*.md, knowledge-base updates

Debug Session Lifecycle: gathering → investigating → fixing → verifying → awaiting_human_verify → resolved

Key behaviors:

• Tracks hypotheses, evidence, and eliminated theories
• State persists across context resets
• Requires human verification before marking resolved
• Appends to persistent knowledge base on resolution
• Consults knowledge base on new sessions

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gsd-user-profiler

Role: Analyzes session messages across 8 behavioral dimensions to produce a scored developer profile.

Property	Value
Spawned by	/gsd:profile-user
Parallelism	Single instance
Tools	Read
Model (balanced)	Sonnet
Color	Magenta
Produces	USER-PROFILE.md, /gsd:dev-preferences, CLAUDE.md profile section

Behavioral Dimensions: Communication style, decision patterns, debugging approach, UX preferences, vendor choices, frustration triggers, learning style, explanation depth.

Key behaviors:

• Read-only agent — analyzes extracted session data, does not modify files
• Produces scored dimensions with confidence levels and evidence citations
• Questionnaire fallback when session history is unavailable

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Agent Tool Permissions Summary

Agent	Read	Write	Edit	Bash	Grep	Glob	WebSearch	WebFetch	MCP
project-researcher	✓	✓		✓	✓	✓	✓	✓	✓
phase-researcher	✓	✓		✓	✓	✓	✓	✓	✓
ui-researcher	✓	✓		✓	✓	✓	✓	✓	✓
research-synthesizer	✓	✓		✓
planner	✓	✓		✓	✓	✓		✓	✓
roadmapper	✓	✓		✓	✓	✓
executor	✓	✓	✓	✓	✓	✓
plan-checker	✓			✓	✓	✓
integration-checker	✓			✓	✓	✓
ui-checker	✓			✓	✓	✓
verifier	✓	✓		✓	✓	✓
nyquist-auditor	✓	✓	✓	✓	✓	✓
ui-auditor	✓	✓		✓	✓	✓
codebase-mapper	✓	✓		✓	✓	✓
debugger	✓	✓	✓	✓	✓	✓	✓
user-profiler	✓

Principle of Least Privilege:

• Checkers are read-only (no Write/Edit) — they evaluate, never modify
• Researchers have web access — they need current ecosystem information
• Executors have Edit — they modify code but not web access
• Mappers have Write — they write analysis documents but not Edit (no code changes)