Meridian:research Phase

/meridian:research-phase — Research Phase Type

Spawns 3 parallel researcher subagents (domain, technical, competitive) for an upcoming phase. Produces RESEARCH.md in the phase artifact directory. The plan phase soft-gates on this artifact being present.

Arguments

• (no args) — research the current pending/planned phase
• --phase <id> — research a specific phase by ID
• --skip-competitive — skip competitive research (faster, 2 subagents only)
• --skip-research — bypass gate warning in /meridian:plan (emergency only)

Keywords

research, investigate, analyze, domain, technical, competitive, findings, pre-plan, context

Procedure

Step 1: Find Target Phase

PYTHONPATH=$MERIDIAN_HOME uv run --project $MERIDIAN_HOME -- python -c "
import json
from scripts.db import connect, get_db_path
from scripts.research_phase import get_research_context
conn = connect(get_db_path('.'))
ctx = get_research_context(conn, phase_id=<phase_id_or_None>)
print(json.dumps(ctx, indent=2, default=str))
conn.close()
"

Pass the --phase <id> value as phase_id, or None if not specified.

If result contains "error", display it and stop — tell the user to run /meridian:plan first.

Store: phase_id, phase_name, description, acceptance_criteria, tech_stack, phase_dir, slug.

Step 2: Check for Existing RESEARCH.md

PYTHONPATH=$MERIDIAN_HOME uv run --project $MERIDIAN_HOME -- python -c "
from pathlib import Path
from scripts.research_phase import check_research_artifact
result = check_research_artifact(Path('<phase_dir>'))
print('exists' if result else 'missing')
"

If exists: ask the user — "RESEARCH.md already exists for this phase. Re-run and overwrite? (y/N)". If No, print the path and exit.

Step 3: Spawn Researcher Subagents (parallel)

Launch all researcher agents in a single parallel batch (same message). Use subagent_type: Explore for each. Read the prompts/research-phase.md template and customize each call with the variables below. Pass absolute paths when referencing files.

Agent 1 — Domain Researcher:

focus_area: domain
focus_label: Domain & Business Context
phase_name: <phase_name>
phase_description: <description>
tech_stack: <tech_stack>
acceptance_criteria: <formatted list>
focus_instructions: |
  Research the real-world problem domain this phase addresses.
  Cover: what users/operators expect from this feature, industry conventions and
  best practices, common failure modes in production, regulatory or compliance
  context (if any), and what "done well" looks like from a practitioner's perspective.
  Do NOT read the codebase — this is pure domain research.

Agent 2 — Technical Researcher:

focus_area: technical
focus_label: Technical Implementation
phase_name: <phase_name>
phase_description: <description>
tech_stack: <tech_stack>
acceptance_criteria: <formatted list>
focus_instructions: |
  Research technical implementation options for this phase in the context of the
  project's tech stack. Read the codebase to find existing patterns, naming conventions,
  and analogous implementations. Cover: relevant libraries/APIs (with versions), known
  pitfalls, integration patterns, performance considerations, and security surface area.
  Quote file paths and line numbers for patterns you find in the codebase.

Agent 3 — Competitive Researcher (skip if --skip-competitive):

focus_area: competitive
focus_label: Competitive & Reference
phase_name: <phase_name>
phase_description: <description>
tech_stack: <tech_stack>
acceptance_criteria: <formatted list>
focus_instructions: |
  Research how similar tools, frameworks, and open-source projects implement equivalent
  features. Identify 2-3 reference implementations worth studying. Surface design
  decisions worth borrowing and anti-patterns worth deliberately avoiding.
  Focus on publicly known systems — no codebase access needed.

Collect all 3 results (or 2 if --skip-competitive).

Step 4: Write RESEARCH.md

PYTHONPATH=$MERIDIAN_HOME uv run --project $MERIDIAN_HOME -- python -c "
from pathlib import Path
from scripts.db import connect, get_db_path
from scripts.research_phase import write_research_md, mark_research_complete
conn = connect(get_db_path('.'))
path = write_research_md(
    phase_dir=Path('<phase_dir>'),
    phase_name='<phase_name>',
    phase_id=<phase_id>,
    domain='''<domain_findings_verbatim>''',
    technical='''<technical_findings_verbatim>''',
    competitive='''<competitive_findings_or_empty_string>''',
)
mark_research_complete(conn, <phase_id>)
conn.close()
print(str(path))
"

Paste the verbatim findings blocks from each subagent.

Step 5: Display Summary

## Research Complete: <Phase Name>

Artifact: <phase_dir>/RESEARCH.md
Subagents: domain ✓  technical ✓  competitive ✓ (or skipped)

### Key Findings

**Domain:** <1-2 sentence summary of domain findings>
**Technical:** <1-2 sentence summary of technical findings>
**Competitive:** <1-2 sentence summary, or "Skipped (--skip-competitive)">

Next: /meridian:plan --phase <phase_id>

Gate Behavior

/meridian:plan and /meridian:execute should check for RESEARCH.md using research_gate():

PYTHONPATH=$MERIDIAN_HOME uv run --project $MERIDIAN_HOME -- python -c "
import json
from pathlib import Path
from scripts.research_phase import research_gate
result = research_gate(Path('<phase_dir>'))
print(json.dumps(result, indent=2))
"

• passed: true → proceed normally
• passed: false → print the warning string and ask the user to confirm skip with --skip-research

This is a soft gate — it warns but does not block execution by default.

What Each Researcher Covers

Output Artifact Structure

.planning/phases/<slug>/
└── RESEARCH.md          ← written by this skill
    ├── Domain & Business Context
    ├── Competitive & Reference Analysis (if run)
    └── Technical Implementation