Night Market Architecture Contract

Night Market Architecture Contract

This skill records the design decisions that hold claude-night-market together, the invariants that enforcement code keeps true, and the weak points that are known and accepted. Read it before proposing a change that crosses a plugin boundary, touches a hook, adds a skill, or bumps a version. Every claim cites in-repo evidence: an ADR (Architecture Decision Record, in docs/adr/), a commit hash, or a checked-in enforcement file. Verify a citation before relying on it:

git log --oneline -1 <hash>
rg -n "Status" docs/adr/<file>.md

Load-bearing decisions

1. Plugins are self-contained deployables

Each of the 23 plugins under plugins/ must install and run alone. There is no shared registry and no root-level shared library that plugins import at runtime (ADR-0001, Accepted). Plugins detect each other at runtime via filesystem checks and must degrade gracefully when a sibling is absent.

Cross-plugin DRY is an anti-pattern here, and that is settled by experiment, not taste. Commit 054e2679 consolidated 1164 lines of duplicated tasks_manager.py from attune, sanctum, and spec-kit into a shared root script. It broke plugin self-containment and was reverted in 29961cd2. The durable fix, d89a55c7, made the copies per-plugin and intentionally different. docs/dependency-audit.md records the per-plugin copies as the approved state. Do not re-propose the consolidation.

Practical test before you extract shared code: if a user installs only one plugin from the marketplace, does your change still work? If not, duplicate the code into each plugin instead.

2. Hooks run under host Python from a cache directory