The platform has had a complete story for one module using another's
*backend* since ADR 0006 — capabilities, versioned ranges, provider
registration. It has had none at all for one module using another's *browser*
code, and every workaround is wrong in a way that matters: a consumer cannot
import a peer module, it cannot re-implement a renderer for a domain it does
not own, and a second `entrypoints` role would put the platform in charge of
deciding when a slot inside someone else's screen should be filled.
Add a generic browser contribution. `manifestVersion: 7` declares one:
namespaced id, its own version, a target capability, a compatible range, and
one artifact. That is the complete list, and the omissions are the decision —
no payload schema, slot, ordering, or rendering hint exists anywhere, so Core
cannot learn what a slide is because the declaration cannot express it.
Discovery resolves a contribution artifact through the *identical* loop every
other compiled entrypoint uses, inheriting the path, containment, symlink,
extension, and file-kind checks rather than getting a weaker copy of them. The
registry publishes one only when another eligible module provides the target
capability within the declared range; otherwise it is absent rather than
mounted and broken. `apps/api` serves it as a sibling of the artifact and
display routes, with the same policy: three lookup keys, one exact match, one
already-validated path, and one indistinguishable 404 for unknown, undeclared,
stale, and incompatible alike.
A consumer discovers through the host, never through a URL. Its descriptor
carries identity, version, and capability; the URL stays server-side and is
resolved exactly as `api.request("records")` is. A module can only ever see
contributions aimed at a capability it itself provides, and cannot name its
way to anything else — a mount for a withheld id fails without fetching.
The consumer owns the domain contract entirely. Input is opaque JSON, checked
structurally so a Date, a function, a cycle, or `undefined` fails at the
boundary rather than vanishing somewhere far from the mistake, and checked for
nothing else. A contributed renderer receives its own id and that input: no
API client, realtime, principal, configuration, database, storage, or
credential. Loading one grants its module nothing.
The contribution ABI is versioned separately from the module UI ABI, because
the two have different shapes and lifecycles and coupling them would force
every module to rebuild whenever either moved. It supports asynchronous
readiness, update-without-remount (a screen that remounted per tick would
restart animations and reload media), deterministic cleanup in a `finally`,
and sanitized failure that never carries the consumer's domain data. Each
renderer mounts in its own isolated root with its own stylesheet.
The template now declares a contribution, so `pnpm build` exercises the whole
authoring path, and the shell suite drives the full relationship — one module
discovering, mounting, updating, and unmounting another's React renderer with
neither importing the other.
Co-Authored-By: Claude Opus 5 <[email protected]>
Modules had no way to be told anything. Announcements — the first real
product Ekklesia will absorb — has zero environment variables and compiles
a LAN IP address into its source, so this is the contract standing between
it and the module system.
- A module declares what it needs in its manifest, using six bounded types
(string, integer, boolean, enum, url, secret) with no nesting and no
regular expressions. Static declaration is what lets the platform validate
configuration *before* deciding whether a module may start: an enabled
module missing a required value is reported `blocked ·
configuration_missing · <key>` rather than taking startup down from inside
its own `start` hook, and Doctor reports the same while still importing no
module code. That forces `manifestVersion: 5`, a hard cutover.
- Ordinary values persist in one Core table (migration 0005), one row per
(module_id, key), stored as text until validated against the declaring
module's current manifest. Nothing is coerced; an invalid stored value
blocks the module rather than falling back to the default. A key the
manifest no longer declares is retained and ignored.
- Secrets are never persisted. There is no encryption at rest in this
repository, so a `secret` key is deployment-supplied and mapped in by the
host under a name the module never sees. A secret declaration has no
`default` field, the write API refuses secret material, and the HTTP view
has no `value` field for one — absent by construction, not filtered.
- Modules receive a frozen `context.config` on the registration, runtime,
and HTTP handler contexts: the same object identity, per module, beside
`services` rather than inside it (services is deliberately one shared
instance). No environment access, no database reference, no way to reach
another module's values.
- Configuration decides eligibility through ADR 0028's existing resolver:
three new blocked reasons, each with a distinct operator fix, propagating
to required dependents through the same mechanism as a disabled module.
- Changes take effect at the next restart; both resources report
restartRequired. New restricted permission
`core.modules.configuration.manage`, separate from lifecycle, at the
sibling prefix `/api/v1/module-configuration`.
- Migration participation stays independent of configuration validity.
Endpoints and credentials for shared infrastructure stay platform
concerns; a module declares which bucket it needs, not an S3 endpoint.
See ADR 0029.
Co-Authored-By: Claude Opus 5 <[email protected]>
ekklesia