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Amends 0100, decisions 2, 9 and 15, and 0021, decision 3.

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Context

0100 and 0021 set the AI engine and write safety. The owner’s answers P14, AI1, AI4 and AI5 (mem L399, L781, L784, L785, 2026-10-20) add provider drivers, the data rules for threads and memory, and guardrails. P14 changes 0100 decision 15, which said AgentCore is not a driver.

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Decision

  1. Hosting driver (P14, AI6). A managed agent runtime, such as AgentCore, is a deferred hosting driver behind the Promptable port. Tools, approval, evidence and audit stay in the action pipeline, whatever the hosting driver.
  2. Model providers (AI1). Drivers for Bedrock (the SaaS default), Anthropic, OpenAI and Google, and local vLLM or Ollama for on-prem and air-gapped installs. A routing table per task type can be overridden per tenant, and tenants can bring their own keys through connections (0107). This closes the provider half of gap C5.
  3. Threads and memory (AI4). Threads are encrypted with the tenant key and kept 90 days by default. They can be exported and erased. Scoped long-term memory is explicit, can be viewed, and can be deleted. Customer data is never used for training.
  4. Guardrails and evals (AI5). Guardrails are layered. Each agent and each built-in prompt has an eval suite. Token budgets are enforced with meters.
  5. Decision 3 of 0021 and decision 9 of 0100 are restated under these rules, not changed in meaning.
  6. Open: the sources give no revival trigger for the deferred AgentCore driver. The owner must name one.

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Consequences

  • Swapping a provider is a driver change and a routing change, not a rewrite of agents.
  • Thread retention is a default, so a tenant that needs longer or shorter has to change a setting within bounds.

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Enforcement

planned — the eval suites run in CI for each agent and built-in prompt, and the meter check blocks a run over its token budget.

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Alternatives

  • AgentCore as the runtime: deferred; it is a hosting driver, not the engine.
  • AgentCore as “not a driver” (0100 decision 15): superseded by P14 (C-29).

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Supersedes and sources

Supersedes: none. Amends: 0100 decisions 2, 9 and 15; 0021 decision 3. Sources: owner answers P14 and AI6 (stackra-decisions-2026-10-19.md L399, L786), AI1 (L781), AI4 (L784), AI5 (L785), all 2026-10-20; gap C5 (provider half). Open question: the revival trigger for the AgentCore hosting driver.