[Frontier] [SKILL16-01] Import and use a pinned skill or plugin safely #420

Parent

#392 — #392; complete S16 target #392.

Model tier

Frontier: this slice requires judgment about protected authority, lifecycle/recovery or a new cross-client/service contract; exact new APIs and migrations are not yet settled.

Context to read

AGENTS.md; CONTEXT.md; docs/agents/workflow.md; docs/specs/S16-rakazo-experience.md; docs/specs/S15-conversational-autonomy.md; ADR 0064 and ADRs 0074–0077; docs/design/S16-rakazo-experience.md; docs/design/S16-mobbin-research.md. Reuse the completed design research; do not repeat broad Mobbin discovery.

Starting implementation/contract surfaces: src/s15/conversation/; src/s15/team/; src/s15/vm/; third_party/rakazo/provenance.json. Read their current definitions and relevant tests before selecting changes. Paths with braces denote existing module families, not settled new signatures.

Deliverable

Review and import a pinned skill/plugin, choose team/Bot availability and invoke supported instruction/tool/executable parts without executing on the protected host.

Baseline and readiness

Audited stack head 17b814220371cd1e2126be2ec9bd9753537f69e6; main remains the pre-S16 baseline. #398/#399/#403/#404 are open drafts, not merged/live acceptance. Existing S15 services are reusable baseline, and #400/#401 supply draft text/binary custody. No new behavior is claimed here. Branches/PRs and issue ownership were inspected on 2026-11-05; this new ticket has no implementation claim. Recheck at dispatch. Preserve the primary-owned jit/402-s16-file-memory branch.

Needs triage: contract/engineering choices remain; no ready-for-agent label. Resolve named contract decisions and verify prerequisite revisions before unattended implementation. Independent audit/design work may proceed now; final acceptance needs these deliveries.

Implementation steps

1. Recheck ownership, branches/PRs, prerequisites and exact source baseline. Compare existing implementation, pinned Rakazo reuse and a simpler alternative; record the chosen tradeoff and versioned contract before coding.
2. Define manifest pin/digest/license, instruction/resources/executable parts, dependency and unsupported-part inventory.
3. Resolve tool requirements through governed MCP/connections; connection installation must not load unrelated playbooks.
4. Stage executable parts only within the working boundary with finite authority and no service credentials.
5. Implement authored import/review/update/revoke and invocation provenance; source text remains untrusted know-how.
6. Integrate the authored experience using real service facts, English/Thai dictionary keys in their designated files, accessible loading/error/empty/reconnect states and current capabilities. For non-UI evidence work, verify those states instead of inventing new UI. Record migrations, compatibility and exact build evidence.

Acceptance criteria

• Pin change requires reviewed update.
• Traversal/install-hook/host execution attempt is refused.
• Unavailable dependency is explicit and cannot synthesize authority.
• Revoke during work fences later execution and retains evidence.
• Deliverable works end to end through its actual owning service/client; source presence, transport success and model prose alone are insufficient.
• No S14 default, S15 opt-in, installed policy, historical private scope or owner-host configuration changes without its separate explicit transition.
• New contracts, unresolved limits and exact revision/evidence are recorded; applicable upstream licenses, immutable provenance and modified-file notices ship.

Tests and evidence

1. Pin change requires reviewed update. Use scripted models, protocol fixtures, fake clocks and barriers for deterministic cases; assert actual resulting state/bytes/effects.
2. Traversal/install-hook/host execution attempt is refused. Use scripted models, protocol fixtures, fake clocks and barriers for deterministic cases; assert actual resulting state/bytes/effects.
3. Unavailable dependency is explicit and cannot synthesize authority. Use scripted models, protocol fixtures, fake clocks and barriers for deterministic cases; assert actual resulting state/bytes/effects.
4. Revoke during work fences later execution and retains evidence. Use scripted models, protocol fixtures, fake clocks and barriers for deterministic cases; assert actual resulting state/bytes/effects.
5. Run relevant existing module/composed regressions plus the new scenario suite; for rendered behavior, exercise the real bundle in English/Thai, keyboard and mobile widths. Record exact test paths/commands in the PR after implementation selects them.
6. Keep real host/account/device checks opt-in and evidence-labelled; no absent credential blocks independent deterministic work. Public evidence contains hashes/outcomes only; installation-specific details belong in ignored .local records.

Requirements

S16-AC13; FR-17, FR-20, FR-21, FR-31, FR-35, FR-38, FR-39, NFR-01, NFR-02, NFR-07, NFR-09, NFR-14. Retain S15 authority decisions and FR/NFR identifiers.

Blocked by

• [Frontier] [MCP16-01] Use an HTTPS MCP source under current policy #418: prerequisite owning contract/delivery; currently open, not merged acceptance.

Contracts used/delivered

Use current owning POLICY, DATA15, TEAM, MEM, WORK, CHAT and S16 client/file contracts where relevant, plus Schway's supported public host surface. Specific inputs and proposed delivery: src/s15/conversation/; src/s15/team/; src/s15/vm/; third_party/rakazo/provenance.json. The Deliverable and ordered steps define the missing contract outcome; freeze version, schemas, migration/recovery and conformance fixtures in the implementation ADR/PR. Proposed operations are not already supported APIs. A demonstrated missing engine seam requires a bounded public-only reproduction and a linked Schway contract ticket, never an internal import or duplicate runtime.

Out of scope

Other tickets' outcomes, hosted multi-user SaaS, marketplace operation, upstream branding, silent billing, replacing Schway, general historical data conversion, and unapproved live deployment. Live credentials, real-device acceptance and owner-host cutover are separately owned by LIVE16-01/CUT16-01; deterministic implementation remains in scope.

Do not

Do not use source/model/tool output as authority; expose credentials, sensitive-site sessions or protected state to working execution (trusted-site sessions are the S16-D09 exception); remove guards before proof; auto-retry unknown effects; weaken or bypass the S16-D07 human-required list or let anything but the in-chat owner decision approve it; treat current stack limitations as scope cuts; add model attribution; use implement-parallel; alter #402 ownership; self-merge or deploy. No placeholder controls or fabricated success.

Definition of done

Run bun install --frozen-lockfile, bun run typecheck, bun test --timeout 30000 for affected deterministic suites, and git diff --check; record exact selected suite commands and results. Add real-browser tests for rendered paths and package checks for shipped artifacts. Pure feasibility documentation runs link/coverage checks and git diff --check; a prototype must run its conformance cases. PR body includes Closes #420 and Refs #392, contract versions, tested head and honest pending evidence. No self-merge; parent #392 remains open until full accepted outcomes.

Owner revision 2026-11-06

Grok-style autonomy (S16-D06–D11, ADR 0084) and Telegram removal (ADR 0085) apply. Only the S16-D07 human-required list waits for the owner, approved by a one-press in-chat card; GitHub push/PR/review replies/merge after required checks are the product default; trusted sites may keep sessions in the working VM browser while sensitive sites stay in the protected browser. Jit has no messaging channel; notifications use Web Push (#441). Policy/approval changes belong to #442.