Project Config

Project config reference

.harness/project.json is the per-project config file. It already carries vault_project, github, and env; task 2 of V4 #32 adds an additive enablement block (type, skills, hooks, registered_at, registered_via, operator_overrides, last_redetect_at) that records this repo's detected/approved configuration. The verification ledger (features.json passes) is a separate file and is untouched.

⚡ Quick Reference

Question	Answer
Where does enablement config live?	.harness/project.json — NOT features.json (locked DC-1).
Who writes it?	scripts/project_config.py — register() calls merge_enablement(), which preserves every other key (vault_project / github / env) and overwrites only the enablement keys.
Where does the file resolve to?	Vault-resident post-V4 #26: <vault>/projects/<slug>/_harness/project.json. The writer routes through harness_memory.write_state_file (.project-mode-aware — routes to the repo-local home <repo>/.harness/ for local-mode projects, which write_state_file now writes with no vault configured; distinct from the migrate-nagging legacy fallback).
What counts as "registered"?	is_registered() = project.json carries a non-empty skills block OR the repo has a repo_registry entry.
What's the default type?	"coding" (the type taxonomy is deferred to V5).
Related pages	Detection rules, Configure a new project, Repo layout

Enablement block schema

The 7 keys build_enablement_block emits and merge_enablement overwrites. Everything else on project.json survives the merge verbatim.

Field	Type	Default	Meaning
type	string	"coding"	Project type. The taxonomy beyond "coding" is deferred to V5.
skills	object	the 6 enableable skills, all enabled	Map <name> → TargetState. Names: memory, design, diataxis-author, pii-scrubber, ship-release, dependabot-fixer.
hooks	object	the 7 enableable hooks, all enabled	Map <name> → TargetState. Names: kill-switch, steer, commit-on-stop, memory-recall-session-start, memory-recall-prompt-submit, memory-reflect-idle, memory-reflect-stop.
registered_at	string (ISO-8601 UTC)	now, at write time	When the block was first written, e.g. 2026-05-29T14:03:00Z.
registered_via	string	"auto-detect"	How the repo was registered — "auto-detect" (the flow) or "manual".
operator_overrides	array	[]	[{at, skill_or_hook, action, reason}] — one entry per opt-out recorded by apply_override (action defaults to "disabled-at-registration").
last_redetect_at	string | null	null	Reserved; stays null (the /setup --redetect flow is deferred).

TargetState shape (each entry in skills / hooks)

Field	Type	Meaning
enabled	bool	Whether the skill/hook is active for this project (false after an opt-out).
auto_detected	bool	true if a rule matched this target; false if it carries the default rationale only.
rationale	string	Why this target is relevant — a detection reason (when matched) or a default reason.
rule_id	string | null	The matching rule's id (e.g. R-wiki), or null when default-enabled.
operator_action	string | null	null until an opt-out flips it to "disabled-at-registration".

Pre-existing keys (unchanged)

The enablement block is additive — these keys are preserved by the merge-writer.

Key	Meaning
vault_project	MemoryVault slug for this repo.
github	GitHub Projects linkage (owner/number/url/repo). See GitHub Projects integration.
env	Per-project environment settings. Pre-existing; untouched by the enablement merge.

Related

• Detection rules — what populates rationale / rule_id in the skills / hooks maps.
• Configure a new project — the flow that writes this block.
• Repo layout — where .harness/project.json sits on disk.
• Auto-detect + auto-configure — why config lives here and not in features.json (DC-1).