design phase 7.1 plugin source

Design: Phase 7.1 — Plugin source + trust/provenance model

Status: implemented in Phase 7.1 (✅). PRD: prd-phase-7-skills.md. Research: research-phase-4.4-skills.md (read first — this design assumes its findings, with the four corrections noted in the PRD).

This design covers the first Phase 7 sub-phase only — the foundation that all later sub-phases build on. It adds a plugin variant to ResourceSource, lands the trust tier + provenance-pin model, defines the SkillSource port (with one no-op implementation), and flips the validator + smoke test that currently reject non-inline skill sources. No outbound network is introduced in 7.1 — the user pastes the spec; trust is computed from the repo owner string. The first fetch lands in 7.2.

What 7.1 adds

Four coupled changes, in dependency order:

Domain (core) — a plugin variant on ResourceSource; a SkillSource port (new file); a TrustTier type; SkillMeta / SkillBundle data shapes mirroring Hermes's dataclasses.
Shared (shared) — the matching zod object for plugin; a TRUSTED_REPOS constant + resolveTrustTier() helper (the single source of truth for the 4 trusted repos + the official ⇒ builtin rule).
Server (server) — extend validateSkillResource to accept plugin; compute trust at save time and stash it on the resource's labels (no schema/storage change needed — labels already exists).
Smoke — flip the INVALID_SKILL_SOURCE block (scripts/smoke.mjs:593) to a positive create-and-verify flow.

The dependency boundary is core → shared → server → smoke. Build each before the next (composite project references need dist).

Part 1 — Domain changes

1a. New `plugin` variant (`packages/core/src/domain/resource.ts:46`)

Append a sixth member to the ResourceSource discriminated union:

export type ResourceSource =
  | { type: 'git'; url: string; ref?: string; path?: string }
  | { type: 'tarball'; url: string; checksum?: string }
  | { type: 'local'; path: string }
  | { type: 'inline'; content: string }
  | { type: 'inline-bundle'; files: Record<string, string> }
  // ---- Phase 7.1 ----
  | {
      type: 'plugin';
      /**
       * Mirrors the CC marketplace.json `source` kinds (research-corrected:
       * 4 live kinds in the official catalog — url / git-subdir / string-path /
       * github; no npm in production, modeled for completeness). The string
       * relative-path form (`"./plugins/foo"`) is NOT accepted here — it only
       * makes sense inside a marketplace repo; Harness Nexus stores resolved specs.
       */
      source:
        | { source: 'github'; repo: string; ref?: string; sha?: string; path?: string }
        | { source: 'url'; url: string; ref?: string; sha?: string; path?: string }
        | { source: 'git-subdir'; url: string; path: string; ref?: string; sha?: string }
        | { source: 'npm'; package: string; version: string; registry?: string };
      /** The plugin this entry resolves to (the `plugin:skill` namespace half). */
      plugin: string;
      /**
       * Optional marketplace-entry version pin. Falls back to `sha` (for git
       * kinds) or the resolved git commit at install time. Absent ⇒ floating,
       * tracked to `ref` (default branch).
       */
      version?: string;
    };

The choice of a new variant over reusing git is settled in the research doc and preserved: plugin carries the namespace (plugin field) and the source-kind distinction (git-subdir is a sparse clone ≠ github/url full clone) that git cannot express.

1b. Trust tier + provenance (computed, not stored as new fields)

Trust and provenance are not new columns or new domain fields. They ride on the existing labels: Record<string, string> (Resource.labels, already in the schema and storage). This avoids a migration and keeps Resource stable.

At save/update time the server computes three label entries (only when source.type === 'plugin'; other kinds are unaffected):

Label key	Value	Source
`trust`	`'builtin'` \| `'trusted'` \| `'community'`	`resolveTrustTier(source)` (Part 2)
`pin`	the `sha` / `version` string, or absent	from the spec
`provenance`	short human string, e.g. `"anthropics/skills@sha:abc123"`	derived from the spec

If the user passes labels of their own, the server overwrites these three keys (trust/provenance are authoritative; user labels coexist for everything else). A community resource with no pin is valid but triggers the install-warning UX in 7.3.

Why labels and not new fields? The trust tier is derived from the spec (it is a function of the repo owner), so storing it is denormalization for UI convenience — labels is the existing extension point for exactly this. Provenance is the same. If we later want to index on trust (e.g. for a ?trust=trusted filter), we can promote it to a real column then; 7.1 does not need it.

1c. `SkillSource` port (new file: `packages/core/src/ports/skill-source.ts`)

A port (pure interface, no I/O imports) mirroring Hermes's ABC ground truth: 4 abstract methods + 1 concrete default (trustLevelFor defaults to 'community'). search is optional — only multi-source adapters (7.4) implement it; the single-marketplace fetcher (7.2) lists the whole catalog and does not need it.

import type { TrustTier, SkillMeta, SkillBundle } from '../domain/skill.js';

/**
 * A source of skills (a marketplace, a GitHub repo, a direct URL, …). Mirrors
 * Hermes's `SkillSource` ABC (`~/.hermes/hermes-agent/tools/skills_hub.py`).
 *
 * This is a PORT — pure interface. Concrete adapters live in
 * `@harness-nexus/server` under `src/infra/source-fetchers/*`. Phase 7.1 ships
 * one no-op implementation (to prove the shape); 7.2 ships the marketplace
 * adapter; 7.4 ships the rest.
 */
export interface SkillSource {
  /** Stable id for this source kind: 'github' | 'url' | 'claude-marketplace' | … */
  sourceId(): string;
  /** Metadata only — no bytes. Returns null if the identifier is unknown here. */
  inspect(identifier: string): Promise<SkillMeta | null>;
  /** The bytes (a SKILL.md + its bundle). Phase 7.2+; 7.1's impl throws. */
  fetch(identifier: string): Promise<SkillBundle | null>;
  /** Optional: search across this source's catalog. Multi-source only (7.4+). */
  search?(query: string, limit?: number): Promise<SkillMeta[]>;
  /**
   * Trust tier for a given identifier. NOT abstract — defaults to 'community'
   * (mirrors Hermes's concrete default). Adapters that know better (github,
   * claude-marketplace) override.
   */
  trustLevelFor(identifier: string): TrustTier {
    return 'community';
  }
}

1d. Domain types for skills (new file: `packages/core/src/domain/skill.ts`)

Three small types, mirroring Hermes's SkillMeta / SkillBundle dataclasses (ground-truth quoted in the research verification):

export type TrustTier = 'builtin' | 'trusted' | 'community';

export interface SkillMeta {
  name: string;
  description: string;
  /** The source_id that produced this meta: 'github' | 'url' | … */
  source: string;
  /** Source-specific identifier (e.g. 'anthropics/skills/skill-creator'). */
  identifier: string;
  trustLevel: TrustTier;
  repo?: string;
  path?: string;
  tags?: string[];
  /** Source-specific extras (category, author, homepage, …). */
  extra?: Record<string, unknown>;
}

export interface SkillBundle {
  name: string;
  /** Relative path → content. One key must be `SKILL.md`. */
  files: Record<string, string | Buffer>;
  source: string;
  identifier: string;
  trustLevel: TrustTier;
  metadata?: Record<string, unknown>;
}

Export both new files from packages/core/src/ports/index.ts and packages/core/src/domain/index.ts respectively (then core/src/index.ts re-exports them, as it already does for the other ports/domains).

Part 2 — Shared schema + trust resolution

2a. zod object for `plugin` (`packages/shared/src/schemas/resource.ts:28`)

Add a sixth arm to the resourceSourceSchema discriminated union. Field shapes mirror Part 1a exactly:

z.object({
  type: z.literal('plugin'),
  source: z.discriminatedUnion('source', [
    z.object({
      source: z.literal('github'),
      repo: z.string().min(1),
      ref: z.string().optional(),
      sha: z.string().optional(),
      path: z.string().optional(),
    }),
    z.object({
      source: z.literal('url'),
      url: z.string().min(1),
      ref: z.string().optional(),
      sha: z.string().optional(),
      path: z.string().optional(),
    }),
    z.object({
      source: z.literal('git-subdir'),
      url: z.string().min(1),
      path: z.string().min(1),
      ref: z.string().optional(),
      sha: z.string().optional(),
    }),
    z.object({
      source: z.literal('npm'),
      package: z.string().min(1),
      version: z.string().min(1),
      registry: z.string().optional(),
    }),
  ]),
  plugin: z.string().min(1),
  version: z.string().optional(),
}),

No change to createResourceSchema / updateResourceSchema — they consume resourceSourceSchema and pick up the new arm automatically.

2b. Trust resolution (new file: `packages/shared/src/trust.ts`)

The single source of truth for the 4 trusted repos and the resolution rules. Lives in shared (not core) because it is a pure function over a constant table — both server and (eventually) web consult it. Mirrors hooks.ts (also at the shared root) as a peer.

Layering correction (verified during implementation). An earlier draft of this section had import type { TrustTier } from '@harness-nexus/core' here. That violates the one-way dependency rule — shared/package.json depends only on zod, never on core (the existing @harness-nexus/core mentions in shared/src are comments only). The implemented file mirrors TrustTier locally via z.infer, exactly how schemas/profile.ts mirrors AgentTarget — see packages/shared/src/trust.ts. Keep the two definitions in sync.

import { z } from 'zod';

/**
 * The zod mirror of `@harness-nexus/core` `TrustTier`. Defined locally (not
 * imported from core) because `shared` does not depend on `core` — matches
 * the `AgentTarget` pattern in `schemas/profile.ts`. Keep in sync with
 * `core/src/domain/skill.ts` `TrustTier`.
 */
export const trustTierSchema = z.enum(['builtin', 'trusted', 'community']);
export type TrustTier = z.infer<typeof trustTierSchema>;

/**
 * The 4 trusted repos (ground-truth verified from Hermes's `TRUSTED_REPOS`,
 * `tools/skills_guard.py:40-49`). Capitalization of `NVIDIA` matters — the
 * comparison lowercases both sides but the canonical form is preserved here.
 */
export const TRUSTED_REPOS: ReadonlySet<string> = new Set([
  'openai/skills',
  'anthropics/skills',
  'huggingface/skills',
  'NVIDIA/skills',
]);

/**
 * Resolve the trust tier for a plugin source. Rules (mirror Hermes
 * `_resolve_trust_level`, skills_hub.py:1050-1061):
 *   - `official` source kind      ⇒ `builtin`  (Harness Nexus owns none today)
 *   - repo owner ∈ TRUSTED_REPOS  ⇒ `trusted`
 *   - otherwise                   ⇒ `community`
 *
 * The 4th Hermes tier (`agent-created`, off-by-default) is NOT surfaced.
 */
export function resolveTrustTier(
  source:
    | { source: 'github'; repo: string }
    | { source: 'url'; url: string }
    | { source: 'git-subdir'; url: string }
    | { source: 'npm'; package: string },
): TrustTier {
  // Extract an `owner/repo` string from the source, lowercase for compare.
  const ownerRepo = extractOwnerRepo(source);
  if (ownerRepo && TRUSTED_REPOS.has(ownerRepo.toLowerCase())) return 'trusted';
  return 'community';
}

/** Best-effort owner/repo extraction; returns null if not parseable. */
function extractOwnerRepo(
  source:
    | { source: 'github'; repo: string }
    | { source: 'url'; url: string }
    | { source: 'git-subdir'; url: string }
    | { source: 'npm'; package: string },
): string | null {
  if (source.source === 'github') return source.repo;
  // url / git-subdir: try to pull owner/repo out of a github URL.
  const match =
    source.source === 'npm'
      ? null
      : source.source === 'url'
        ? source.url.match(/github\.com[/:]([^/]+\/[^/]+?)(?:\.git)?(?:[/?#]|$)/i)
        : source.url.match(/github\.com[/:]([^/]+\/[^/]+?)(?:\.git)?(?:[/?#]|$)/i);
  return match ? match[1] : null;
}

Re-export from packages/shared/src/index.ts. (Note: core cannot import from shared — dependency direction is one-way. resolveTrustTier takes the narrow source-shape union, not the full ResourceSource, so shared does not need to import the domain type beyond the TrustTier re-export, which already flows core → shared.)

Part 3 — Server validation flip

3a. Accept `plugin` in `validateSkillResource` (`packages/server/src/modules/resources.ts:275`)

The current validator hard-rejects anything but inline / inline-bundle (409 INVALID_SKILL_SOURCE). Extend the allowlist and add plugin-specific validation (path safety for the path field, since the install writer joins it onto a target directory):

function validateSkillResource(kind: ResourceKind, source: Resource['source']): void {
  if (kind !== 'skill') return;
  switch (source.type) {
    case 'inline':
      return; // single-file SKILL.md body
    case 'inline-bundle':
      validateBundlePaths(source.files); // extracted from the current logic
      return;
    case 'plugin':
      validatePluginSource(source); // new — see below
      return;
    default:
      // git / tarball / local still rejected for skills in 7.1 (a plugin
      // source is the right representation for an external skill; a bare git
      // ref loses the plugin namespace). Revisit if a use case appears.
      throw new AppError(
        `A skill source must be 'inline', 'inline-bundle', or 'plugin', got '${source.type}'`,
        409,
        'INVALID_SKILL_SOURCE',
      );
  }
}

function validatePluginSource(source: Extract<Resource['source'], { type: 'plugin' }>): void {
  // Path safety for github/url/git-subdir path fields (the install writer
  // joins them onto a target dir — same traversal risk as bundle paths).
  const s = source.source;
  const path = 'path' in s ? s.path : undefined;
  if (path !== undefined && (path.startsWith('/') || path.includes('..') || path.includes('\\'))) {
    throw new AppError(
      `Unsafe plugin source path: "${path}" (must be relative, no '..')`,
      400,
      'VALIDATION_ERROR',
    );
  }
  // npm requires a version (the schema enforces non-empty, but be explicit).
  if (s.source === 'npm' && !s.version) {
    throw new AppError('An npm plugin source requires a version', 400, 'VALIDATION_ERROR');
  }
}

git / tarball / local stay rejected for skills in 7.1 — plugin is the correct representation for an external skill (the namespace matters). This is a deliberate narrowing; revisit if a real use case for a bare-git skill appears.

3b. Compute trust + provenance at save time (`resources.ts`, POST + PATCH)

In both the create and update handlers, after validateSkillResource and before save, if source.type === 'plugin', compute the three labels (Part 1b) and merge them into labels:

import { resolveTrustTier } from '@harness-nexus/shared';

function withTrustLabels(resource: Resource): Resource {
  if (resource.source.type !== 'plugin') return resource;
  const tier = resolveTrustTier(resource.source.source);
  const pin =
    'sha' in resource.source.source ? resource.source.source.sha : resource.source.version;
  const provenance = buildProvenance(resource.source); // 'anthropics/skills@sha:abc123'
  return {
    ...resource,
    labels: {
      ...(resource.labels ?? {}),
      trust: tier,
      ...(pin ? { pin } : {}),
      provenance,
    },
  };
}

Call it in the POST handler after constructing the resource object (before save), and in the PATCH handler after merging next (before save). Existing user-supplied labels are preserved except for the three authoritative keys.

3c. `resourceView` — no change

serialize.resourceView is an identity function today and stays that way. The trust labels are already part of Resource.labels and flow through unchanged. (If we later want to redact something — e.g. a private registry token in a custom registry URL — this is the seam.)

Part 4 — Storage

No migration. No driver change. The storage layer is fully variant-agnostic (verified):

SQLite (packages/server/src/infra/storage/sqlite/repos.ts:171, 582): source is JSON.stringify-ed on write and JSON.parse-ed on read — the new plugin shape round-trips with zero code change. The as ResourceSource cast at line 171 picks up the new variant automatically once core exports it.
Memory (packages/server/src/infra/storage/memory/index.ts:177-206): stores the Resource object directly in a Map — no serialization, no branching.
labels is already a JSON column (labels TEXT, JSON-encoded); the three new keys ride along for free.

Part 5 — SDK

No code change. packages/sdk-ts/src/index.ts is pure pass-through: it JSON.stringifys the request body and ships it. createResource / updateResource accept source: ResourceSource, and ResourceSource is re-exported (line 370) from @harness-nexus/core — once core adds plugin, the SDK accepts it automatically. The TrustTier / SkillMeta / SkillBundle types should be added to the SDK's re-export list (line 369-371) for client ergonomics.

Part 6 — One no-op `SkillSource` implementation

To prove the port shape compiles and round-trips, ship one no-op adapter in packages/server/src/infra/source-fetchers/noop-source.ts:

import type { SkillSource } from '@harness-nexus/core';

/** No-op adapter — proves the port shape. Real adapters arrive in 7.2/7.4. */
export class NoopSkillSource implements SkillSource {
  sourceId(): string {
    return 'noop';
  }
  async inspect(): Promise<null> {
    return null;
  }
  async fetch(): Promise<null> {
    return null;
  }
  // search is optional — omitted.
}

It is not wired to any route in 7.1 (there is no registry of sources yet — that arrives in 7.2 alongside the marketplace fetch endpoint). Its only job is to make tsc exercise the port contract.

Part 7 — Smoke test flip (`scripts/smoke.mjs:593-606`)

The current block asserts source: { type: 'git', url } is rejected with 409 INVALID_SKILL_SOURCE. Replace it with a positive plugin flow and add trust assertions. Keep a negative assertion for git (which stays rejected — see Part 3a):

log('\n--- [7.1] skill with plugin source accepted; trust computed ---');

// Positive: anthropics/skills github plugin ⇒ trusted tier.
r = await req('POST', '/api/resources', {
  token: userToken,
  body: {
    key: 'skill:plugin-trusted',
    kind: 'skill',
    name: 'trusted-plugin-skill',
    scope: 'personal',
    source: {
      type: 'plugin',
      source: { source: 'github', repo: 'anthropics/skills', sha: 'abc123def456' },
      plugin: 'skill-creator',
    },
    targets: ['claude-code'],
  },
});
expect('plugin skill created', r.status, 201);
expect('plugin source round-trips', r.json.resource.source.type, 'plugin');
expect('trust label = trusted', r.json.resource.labels?.trust, 'trusted');
expect('pin label = sha', r.json.resource.labels?.pin, 'abc123def456');

// Positive: unknown repo ⇒ community tier, no pin ⇒ no pin label.
r = await req('POST', '/api/resources', {
  token: userToken,
  body: {
    key: 'skill:plugin-community',
    kind: 'skill',
    name: 'community-plugin-skill',
    scope: 'personal',
    source: { type: 'plugin', source: { source: 'github', repo: 'random/dev' }, plugin: 'thing' },
    targets: ['claude-code'],
  },
});
expect('community plugin skill created', r.status, 201);
expect('trust label = community', r.json.resource.labels?.trust, 'community');
expect('no pin label when floating', r.json.resource.labels?.pin, undefined);

// Negative: git source still rejected for skills (use 'plugin' instead).
r = await req('POST', '/api/resources', {
  token: userToken,
  body: {
    key: 'skill:git-nope',
    kind: 'skill',
    name: 'nope',
    scope: 'personal',
    source: { type: 'git', url: 'https://example.com/repo' },
    targets: ['claude-code'],
  },
});
expect('skill git source still rejected', r.status, 409);
expect('error code INVALID_SKILL_SOURCE', r.json.error, 'INVALID_SKILL_SOURCE');

// Negative: unsafe path in plugin source.
r = await req('POST', '/api/resources', {
  token: userToken,
  body: {
    key: 'skill:plugin-badpath',
    kind: 'skill',
    name: 'badpath',
    scope: 'personal',
    source: {
      type: 'plugin',
      source: { source: 'github', repo: 'anthropics/skills', path: '../etc/passwd' },
      plugin: 'x',
    },
    targets: ['claude-code'],
  },
});
expect('unsafe plugin path rejected', r.status, 400);

Part 8 — Edit map (the full blast radius, verified)

For the implementer — every spot that changes in 7.1:

File	Change
`packages/core/src/domain/resource.ts:46`	Add `\| { type: 'plugin'; ... }` to the union (Part 1a).
`packages/core/src/domain/skill.ts` (new)	`TrustTier`, `SkillMeta`, `SkillBundle` (Part 1d).
`packages/core/src/domain/index.ts`	Re-export `./skill.js`.
`packages/core/src/ports/skill-source.ts` (new)	`SkillSource` interface (Part 1c).
`packages/core/src/ports/index.ts`	Re-export `./skill-source.js`.
`packages/shared/src/schemas/resource.ts:28`	Add the `plugin` arm to `resourceSourceSchema` (Part 2a).
`packages/shared/src/trust.ts` (new)	`TRUSTED_REPOS`, `resolveTrustTier()` (Part 2b).
`packages/shared/src/index.ts`	Re-export `./trust.js` + `./schemas/resource.js` (already exports the latter).
`packages/server/src/modules/resources.ts:275`	Extend `validateSkillResource`; add `validatePluginSource`; call `withTrustLabels` in POST + PATCH (Parts 3a, 3b).
`packages/server/src/infra/source-fetchers/noop-source.ts` (new)	`NoopSkillSource` (Part 6).
`packages/sdk-ts/src/index.ts:369`	Add `TrustTier`, `SkillMeta`, `SkillBundle` to the type re-exports (Part 5).
`scripts/smoke.mjs:593-606`	Flip the assertion block (Part 7).

Not touched (variant-agnostic by construction — verified by grep):

packages/server/src/infra/storage/sqlite/repos.ts — source is JSON.
packages/server/src/infra/storage/memory/index.ts — direct Map.
packages/server/src/modules/serialize.ts — resourceView is identity.
packages/core/src/domain/profile.ts — references resources by id/kind, not source.
packages/core/src/ports/repository.ts — ResourceRepository is source-agnostic.

Part 9 — Scope, permission, and security rules

No new outbound network in 7.1. Trust is computed from the repo owner string (resolveTrustTier); no fetch happens. The first fetch lands in 7.2 behind MARKETPLACE_ALLOWLIST.
The existing scope model applies unchanged. A plugin-source skill is global (admin-mutate) or personal (owner-only) exactly like every other resource. No new scope concepts.
Trust labels are advisory. They inform the install-warning UX (7.3); they do not gate storage. A community skill stores fine — the warning appears later, in the profile/install path.
git / tarball / local stay rejected for skills. A bare git ref loses the plugin namespace; plugin is the correct external-skill shape. If a non-plugin external skill use case appears, revisit.

Out of scope (deferred to 7.2+)

Any outbound fetch — marketplace browse, plugin resolution, SHA pinning by fetching the repo. All of this is 7.2+.
The marketplace allowlist + GET /api/skills/marketplaces/:id/plugins endpoint — 7.2.
The hub search UI — 7.3.
Real SkillSource adapters (github, url, skills-sh, …) — 7.4. 7.1 ships only the no-op proof-of-shape.
Content security scanning — not modeled; Harness Nexus stores references, the target tool executes.
Promoting trust to a real column / indexed filter — only if a ?trust=trusted list filter is needed; labels suffices for 7.1's UI badge.
The 4th Hermes trust tier (agent-created) — off-by-default in Hermes, not surfaced here.
Install-time materialization — Phase 3.3's writer pipeline. 7.1 only stores the reference.

Verification checklist

When implementing 7.1:

pnpm --filter @harness-nexus/core run build — the new union member + port + domain types compile.
pnpm --filter @harness-nexus/shared run build — zod picks up the new arm; resolveTrustTier typechecks.
pnpm --filter @harness-nexus/server run build — validateSkillResource and withTrustLabels compile; the no-op adapter satisfies SkillSource.
pnpm --filter @harness-nexus/sdk-ts run build — re-exports compile.
pnpm -r run typecheck — whole tree.
Boot a memory-driver server (STORAGE_DRIVER=memory JWT_SECRET=… pnpm dev:server) and run node scripts/smoke.mjs — the flipped [7.1] block passes.

Home

Features

For developers

design phase 7.1 plugin source

Design: Phase 7.1 — Plugin source + trust/provenance model

What 7.1 adds

Part 1 — Domain changes

1a. New plugin variant (packages/core/src/domain/resource.ts:46)

1b. Trust tier + provenance (computed, not stored as new fields)

1c. SkillSource port (new file: packages/core/src/ports/skill-source.ts)

1d. Domain types for skills (new file: packages/core/src/domain/skill.ts)

Part 2 — Shared schema + trust resolution

2a. zod object for plugin (packages/shared/src/schemas/resource.ts:28)

2b. Trust resolution (new file: packages/shared/src/trust.ts)

Part 3 — Server validation flip

3a. Accept plugin in validateSkillResource (packages/server/src/modules/resources.ts:275)

3b. Compute trust + provenance at save time (resources.ts, POST + PATCH)

3c. resourceView — no change

Part 4 — Storage

Part 5 — SDK

Part 6 — One no-op SkillSource implementation

Part 7 — Smoke test flip (scripts/smoke.mjs:593-606)

Part 8 — Edit map (the full blast radius, verified)

Part 9 — Scope, permission, and security rules

Out of scope (deferred to 7.2+)

Verification checklist

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1a. New `plugin` variant (`packages/core/src/domain/resource.ts:46`)

1c. `SkillSource` port (new file: `packages/core/src/ports/skill-source.ts`)

1d. Domain types for skills (new file: `packages/core/src/domain/skill.ts`)

2a. zod object for `plugin` (`packages/shared/src/schemas/resource.ts:28`)

2b. Trust resolution (new file: `packages/shared/src/trust.ts`)

3a. Accept `plugin` in `validateSkillResource` (`packages/server/src/modules/resources.ts:275`)

3b. Compute trust + provenance at save time (`resources.ts`, POST + PATCH)

3c. `resourceView` — no change

Part 6 — One no-op `SkillSource` implementation

Part 7 — Smoke test flip (`scripts/smoke.mjs:593-606`)