msd-core/gsd-core/workflows/scan.md

Lightweight codebase assessment. Spawns a single gsd-codebase-mapper agent for one focus area, producing targeted documents in `.planning/codebase/`.

<required_reading> Read all files referenced by the invoking prompt's execution_context before starting. </required_reading>

<available_agent_types> Valid GSD subagent types (use exact names — do not fall back to 'general-purpose'):

• gsd-codebase-mapper — Maps project structure and dependencies </available_agent_types>

Focus-to-Document Mapping

Focus	Documents Produced
tech	STACK.md, INTEGRATIONS.md
arch	ARCHITECTURE.md, STRUCTURE.md
quality	CONVENTIONS.md, TESTING.md
concerns	CONCERNS.md
tech+arch	STACK.md, INTEGRATIONS.md, ARCHITECTURE.md, STRUCTURE.md

Step 1: Parse arguments and resolve focus

Parse the user's input for --focus <area>. Default to tech+arch if not specified.

Validate that the focus is one of: tech, arch, quality, concerns, tech+arch.

If invalid:

Unknown focus area: "{input}". Valid options: tech, arch, quality, concerns, tech+arch

Exit.

Step 2: Check for existing documents

_GSD_SHIM_NAME="gsd-tools.cjs"; _GSD_RUNTIME_ROOT="${RUNTIME_DIR:-$(git rev-parse --show-toplevel 2>/dev/null || pwd)}"; GSD_TOOLS="${_GSD_RUNTIME_ROOT}/gsd-core/bin/${_GSD_SHIM_NAME}"; _gsd_at() { for _p; do if [ -f "$_p" ]; then GSD_TOOLS="$_p"; return 0; fi; done; return 1; }; if _gsd_at "${_GSD_RUNTIME_ROOT}/gsd-core/bin/${_GSD_SHIM_NAME}" "${_GSD_RUNTIME_ROOT}/.claude/gsd-core/bin/${_GSD_SHIM_NAME}" "${_GSD_RUNTIME_ROOT}/.codex/gsd-core/bin/${_GSD_SHIM_NAME}"; then gsd_run() { node "$GSD_TOOLS" "$@"; }; elif unset -f gsd_run; _G="$(command -v gsd_run)"; then GSD_TOOLS="$_G"; gsd_run() { "$GSD_TOOLS" "$@"; }; elif _gsd_at "${CLAUDE_CONFIG_DIR:-$HOME/.claude}/gsd-core/bin/${_GSD_SHIM_NAME}" "${HERMES_HOME:-$HOME/.hermes}/gsd-core/bin/${_GSD_SHIM_NAME}" "${CURSOR_CONFIG_DIR:-$HOME/.cursor}/gsd-core/bin/${_GSD_SHIM_NAME}" "${CODEX_HOME:-$HOME/.codex}/gsd-core/bin/${_GSD_SHIM_NAME}" "${GEMINI_CONFIG_DIR:-$HOME/.gemini}/gsd-core/bin/${_GSD_SHIM_NAME}" "${COPILOT_CONFIG_DIR:-$HOME/.copilot}/gsd-core/bin/${_GSD_SHIM_NAME}" "${WINDSURF_CONFIG_DIR:-$HOME/.codeium/windsurf}/gsd-core/bin/${_GSD_SHIM_NAME}" "${AUGMENT_CONFIG_DIR:-$HOME/.augment}/gsd-core/bin/${_GSD_SHIM_NAME}" "${TRAE_CONFIG_DIR:-$HOME/.trae}/gsd-core/bin/${_GSD_SHIM_NAME}" "${QWEN_CONFIG_DIR:-$HOME/.qwen}/gsd-core/bin/${_GSD_SHIM_NAME}" "${CODEBUDDY_CONFIG_DIR:-$HOME/.codebuddy}/gsd-core/bin/${_GSD_SHIM_NAME}" "${CLINE_CONFIG_DIR:-$HOME/.cline}/gsd-core/bin/${_GSD_SHIM_NAME}" "${GROK_AGENTS_HOME:-$HOME/.agents}/gsd-core/bin/${_GSD_SHIM_NAME}" "${ANTIGRAVITY_CONFIG_DIR:-$HOME/.gemini/antigravity}/gsd-core/bin/${_GSD_SHIM_NAME}" "${OPENCODE_CONFIG_DIR:-${XDG_CONFIG_HOME:-$HOME/.config}/opencode}/gsd-core/bin/${_GSD_SHIM_NAME}" "${KILO_CONFIG_DIR:-${XDG_CONFIG_HOME:-$HOME/.config}/kilo}/gsd-core/bin/${_GSD_SHIM_NAME}"; then gsd_run() { node "$GSD_TOOLS" "$@"; }; else echo "ERROR: gsd-tools.cjs not found at $GSD_TOOLS and gsd_run is not on PATH. Run: npx -y @opengsd/gsd-core@latest --claude --local" >&2; exit 1; fi; GSD_IDENTITY_STATUS=unverified; case "$(gsd_run runtime-identity --raw 2>/dev/null || true)" in '{"packageName":"@opengsd/gsd-core"'*'}') GSD_IDENTITY_STATUS=ok;; esac; export GSD_IDENTITY_STATUS; [ "$GSD_IDENTITY_STATUS" = ok ] || echo "WARNING: \"$GSD_TOOLS\" did not prove it is @opengsd/gsd-core - it is either a different package or an @opengsd/gsd-core older than the runtime-identity verb. See docs/how-to/diagnose-a-foreign-gsd-tools.md" >&2; if [ -n "${CLAUDE_ENV_FILE:-}" ] && [ -n "${GSD_TOOLS:-}" ]; then printf "export PATH='%s':\"\$PATH\"\n" "${GSD_TOOLS%/*}" >> "$CLAUDE_ENV_FILE" 2>/dev/null || true; fi
INIT=$(gsd_run query init.map-codebase 2>/dev/null || echo "{}")
if [[ "$INIT" == @file:* ]]; then INIT=$(cat "${INIT#@file:}"); fi

Parse JSON for: mapper_model, commit_docs, search_gitignored, parallelization, subagent_timeout, date, codebase_dir, existing_maps, has_maps, planning_exists, codebase_dir_exists.

Look up which documents would be produced for the selected focus (from the mapping table above).

For each target document, check if it already exists in .planning/codebase/:

ls -la .planning/codebase/{DOCUMENT}.md 2>/dev/null

If any exist, show their modification dates and ask:

Existing documents found:
  - STACK.md (modified 2026-04-03)
  - INTEGRATIONS.md (modified 2026-04-01)

Overwrite with fresh scan? [y/N]

If user says no, exit.

Step 3: Create output directory

mkdir -p .planning/codebase

Step 4: Spawn mapper agent

Spawn a single gsd-codebase-mapper agent with the selected focus area:

Print: ◆ Spawning scanner... (runs in a subagent — no output until it returns, ~1–5 min; expected, not a freeze)

Runtime-aware dispatch (#2508 Phase 4). GSD workflows dispatch specialized subagents by role. Before dispatching on a built-in-only runtime (kimi-code — three built-ins only), resolve the role to a built-in via gsd_run query resolve-dispatch-type --requested <role> --raw. On named-dispatch runtimes (Claude/OpenCode/…) the role is returned unchanged; on kimi-code it maps to coder/explore/plan by role-suffix. The persona rides ${AGENT_SKILLS_<ROLE>} (Phase 3) regardless. See @gsd-core/references/runtime-aware-dispatch.md.

#2517 model resolution: mapper_model is the field init.map-codebase emits (parsed in Step 2) — this is the same binding map-codebase.md uses. Omit the model= parameter entirely when mapper_model is "inherit" or empty; do NOT pass model="" or model="inherit", which 404s on non-Claude runtimes. Omitting inherits the orchestrator's model.

Agent(
  prompt="Scan this codebase with focus: {focus}. Write results to {codebase_dir}/. Produce only: {document_list}",
  subagent_type="gsd-codebase-mapper",
  model="{mapper_model}"
)

ORCHESTRATOR RULE — CODEX RUNTIME: After calling Agent() above, stop working on this task immediately. Do not read more files, edit code, or run tests related to this task while the subagent is active. Wait for the subagent to return its result. This prevents duplicate work, conflicting edits, and wasted context. Only resume when the subagent result is available.

Step 5: Report

## Scan Complete

**Focus:** {focus}
**Documents produced:**
{list of documents written with line counts}

Use `/gsd:map-codebase` for a comprehensive 4-area parallel scan.

<success_criteria>

• Focus area correctly parsed (default: tech+arch)
• Existing documents detected with modification dates shown
• User prompted before overwriting
• Single mapper agent spawned with correct focus
• Output documents written to .planning/codebase/ </success_criteria>