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docs(adr): ADR-0063 — two kernel agents (ask/build); skills are the third-party extension primitive - #2164
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…rd-party extension primitive Supersedes ADR-0040 §3/§4: withdraws tenant-authored custom agents; the extension primitive is *.skill.ts (+ tools/MCP). Two platform-owned shells split by what they mutate — ask (records, OSS/free) and build (metadata, cloud/paid) — carrying the architecture, governance, and commercial line on one seam. Adds skill->shell affinity contract, intent-verb naming (ask/build canonical; data_chat/metadata_assistant as silent aliases), and tier-aware routing. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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…64 tool scoping (#2167) Reverses ADR-0040's unified single-assistant core (merged first cut of ADR-0063 in #2164 kept it). ask and build are two products for different needs — like Claude Chat vs Claude Code — bound by the surface the user is in, not a per-turn intent classifier or a roster. Keeps ADR-0040's "user never picks", re-grounded as surface binding. - ADR-0063 (revised): two agents (ask ≈ Chat, free/OSS; build ≈ Code, paid/cloud); skills (+tools/MCP) are the only third-party extension primitive; *.agent.ts closed to third parties; skill→agent surface affinity; ask/build canonical naming; supersedes ADR-0040 core + §3. - ADR-0064 (new): tool scoping — an agent's tools = the union of its skills' tools; remove the global fall-through; resolves ADR-0040 §4. - Assessment: four-repo touchpoint inventory + findings that drove D2. Co-authored-by: Jack Zhuang <277994282+os-zhuang@users.noreply.github.com> Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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Adds ADR-0063, settling the platform agent model and superseding ADR-0040 §3/§4.
Decision: the kernel keeps exactly two platform-owned agent shells, split by what they mutate:
ask(Claude-Chat analogue)@objectstack/service-ai)build(Claude-Code analogue)../cloud/service-ai-studio)Everything else — domain depth, persona, playbooks, external reach — is a skill (+ tools/MCP). Third parties extend via
*.skill.ts, never*.agent.ts. ADR-0040's 'custom agents are a builder feature' is withdrawn.Why: the platform is metadata-driven so the domain ontology is already shared with
askfor free (a custom agent to 'teach the industry' is a category error — the leftover is a skill); skills compose and scale, agents don't (Claude Code is hugely capable with zero user-authored agents); the records-vs-metadata seam carries the architectural, governance, and commercial boundary on one cut.Contents: two-shell table · skills+tools/MCP as the only third-party primitive · skill→shell affinity (
surface: ask|build|both) · naming (ask/buildcanonical,data_chat/metadata_assistantsilent aliases) · tier-aware routing · cleanup checklist (tracked as a separate issue).Docs-only; no code changes.
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