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<div class="wrap"><header><div class="eyebrow"><span>CUST-ADR-002</span> <span class="stat">accepted · accepted-1</span> <span>the-custodian</span> <span>reviewed 2026-03-12</span><span>generated from canonical source — do not edit</span></div><h1>Custodian Agent Runtime — v0.1 Bootstrap Design</h1><p class="sub">Source: <code>the-custodian · canon/architecture/adr-002-custodian-agent-runtime-design.md · f9435cd605cc5b3cb0f2e957ce6287d9f3129aac</code></p><p class="sub">Review due: 2026-09-12</p></header><div class="layout"><nav class="rail" aria-label="Sections"><ol><li><a href="#status"><span class="n">·</span>Status</a></li><li><a href="#context"><span class="n">·</span>Context</a></li><li><a href="#decisions"><span class="n">·</span>Decisions</a></li><li><a href="#consequences"><span class="n">·</span>Consequences</a></li><li><a href="#deferred"><span class="n">·</span>Deferred</a></li></ol></nav><main><section id="status"><h2>Status</h2>
<p>Accepted.</p>
</section>
<section id="context"><h2>Context</h2>
<p>CUST-WP-0001 requires a first working skeleton of the Custodian as an acting agent: a loop that observes project state, reasons about it, and executes bounded write operations — without human interaction for each step.</p>
<p>The dependencies (llm-connect, operational Railiance infra) are now resolved. This ADR captures the five key architectural decisions for the v0.1 bootstrap.</p>
</section>
<section id="decisions"><h2>Decisions</h2>
<h3>D1 — Location: <code>runtime/</code> inside the-custodian (not a new repo)</h3>
<p><strong>Decision:</strong> The runtime lives under <code>the-custodian/runtime/</code> as a standalone Python package (<code>pyproject.toml</code>, own venv) rather than a new repository.</p>
<p><strong>Rationale:</strong> The runtime is tightly coupled to canon (reads constitution, memory) and the state-hub (its primary coordination layer). A separate repo adds friction with no v0.1 benefit. The existing <code>runtime/</code> scaffold confirms the original intent. Extraction to its own repo is deferred to when the runtime has stable boundaries and multiple consumers.</p>
<h3>D2 — OODA loop: single-pass synchronous CLI</h3>
<p><strong>Decision:</strong> One <code>run()</code> call = one complete Observe → Orient → Decide → Act cycle. Entry point is a CLI (<code>agent.py</code>) invoked manually or by a cron job.</p>
<pre>Observe — HTTP GET to state-hub: state summary or domain summary
Orient — Load constitution + build structured LLM context prompt
Decide — Single LLM call (via llm-connect) returns a JSON action plan
Act — Execute only sanctioned write operations from the plan</pre>
<p><strong>Rationale:</strong> Async event loops and daemons add operational complexity that v0.1 doesn't need. A single-pass CLI is testable, debuggable, and can be scheduled externally. The transition to an event-driven loop is Phase 2.</p>
<h3>D3 — LLM backend: ClaudeCodeAdapter by default</h3>
<p><strong>Decision:</strong> The runtime uses <code>llm_connect.ClaudeCodeAdapter</code> as its default LLM backend (shells out to <code>claude --print</code>). Provider is configurable via <code>--llm</code> flag to support <code>gemini</code>, <code>openrouter</code>, or <code>openai</code>.</p>
<p><strong>Rationale:</strong> <code>ClaudeCodeAdapter</code> requires no API key and honours the Local-First value (V2). All current deployments have Claude Code available. The llm-connect abstraction means switching providers is a one-line change.</p>
<h3>D4 — Action constraint: three sanctioned write operations only</h3>
<p><strong>Decision:</strong> The agent may execute exactly three state-hub write operations without human approval:</p>
<ol><li><code>add_progress_event</code> — append an observation to the event log</li><li><code>update_task_status</code> — mark a task done/in_progress (reversible)</li><li><code>flag_for_human</code> — raise an intervention flag (escalation, not action)</li></ol>
<p>All other operations (create workstream, record decision, resolve decision, write to canon) require human approval before execution.</p>
<p><strong>Rationale:</strong> Constitution §3/§4 require bounded agency. The three operations are either append-only (progress events), reversible (task status), or explicitly escalating (flag). They cannot produce irreversible harm.</p>
<h3>D5 — LLM response format: JSON block in markdown</h3>
<p><strong>Decision:</strong> The LLM is prompted to return a Markdown response with a fenced ```json block containing the structured action plan:</p>
<pre>{
&quot;observations&quot;: [&quot;...&quot;],
&quot;progress_events&quot;: [
{&quot;summary&quot;: &quot;...&quot;, &quot;workstream_id&quot;: &quot;...&quot;, &quot;event_type&quot;: &quot;note&quot;}
],
&quot;tasks_to_update&quot;: [
{&quot;task_id&quot;: &quot;...&quot;, &quot;status&quot;: &quot;done&quot;}
],
&quot;tasks_to_flag&quot;: [
{&quot;task_id&quot;: &quot;...&quot;, &quot;note&quot;: &quot;...&quot;}
]
}</pre>
<p>The surrounding Markdown is preserved as a human-readable reasoning trace and written to <code>memory/working/</code> as a session note.</p>
<p><strong>Rationale:</strong> JSON blocks are robust to extraction (delimited), LLMs produce them reliably with clear instructions, and the surrounding prose gives Bernd an auditable reasoning trace without requiring a separate reasoning step.</p>
</section>
<section id="consequences"><h2>Consequences</h2>
<ul><li><code>runtime/</code> becomes a standalone Python package; <code>make agent-run DOMAIN=x</code> invokes it.</li><li>The runtime has no DB schema changes and no new API endpoints — it is a pure client of the existing state-hub HTTP API.</li><li>Autonomous actions are limited to append-only writes and escalations. Any expansion of the action surface requires a new ADR and human approval.</li><li>The v0.1 loop is single-user (Bernd). Multi-agent expansion is Phase 2+.</li></ul>
</section>
<section id="deferred"><h2>Deferred</h2>
<ul><li>Async event loop / daemon mode (Phase 2)</li><li>RAG over canon (Phase 1 roadmap item)</li><li>Tool adapters beyond state-hub HTTP (planned in <code>runtime/tool_adapters/</code>)</li><li>Deployment on Railiance k3s as a scheduled CronJob</li></ul>
</section><footer><span>CUST-ADR-002 · accepted-1 · accepted</span><span>the-custodian · canon/architecture/adr-002-custodian-agent-runtime-design.md · f9435cd605cc5b3cb0f2e957ce6287d9f3129aac</span></footer></main></div></div></html>