Context
Epic #13349 owns the Agent Harness H2 path: chat/work surface -> constrained blueprint -> live first Neo widget. The current child chain covers the first rendered widget (#13353 / PR #13354), visible transcript / accepted-blueprint evidence (#13355), and safe first-widget request intake (#13357).
ADR 0020 and #13012 both make the next product promise explicit: the first widget must be live-mutable after it appears, not just generated once. ADR 0020 states the canonical demo as "build me a neo grid" -> a pane that becomes its own window, live-mutable; #13012 states that the standalone harness mutates itself through the same Neural Link mechanism it uses to build apps.
Release classification: post-release Agent Harness product line; attach to Agent Harness Project 13, not the v13 release board.
The Problem
After #13357, the user can submit the canonical first-widget request and see deterministic widget provenance. That still stops short of the H2 proof if the result cannot be changed through the same conversational surface. A static first widget is a better demo, not yet a co-inhabited live object.
This ticket owns the next small proof: bounded follow-up requests mutate the existing first-widget state. The slice must stay constrained and reversible in shape. It should accept only a small, explicit edit grammar over the first widget, such as title, row count, column visibility, or sample-data reset. It must not introduce arbitrary code execution, generic provider orchestration, durable persistence, or Node-git write-through.
The Architectural Reality
learn/agentos/decisions/0020-agent-harness-concept.md names pillar 2 as conversational app creation and the canonical demo as chat -> live blueprint emission -> live-mutable grid pane.resources/content/issues/chunk-2/issue-13012.md names runtime mutation via Neural Link and separately names NL-mutation-to-commit write-through onto Node-git. Those are related but not the same leaf.learn/agentos/NeuralLink.md lists constrained runtime mutation tools such as set_instance_properties, create_component, remove_component, undo, and redo. This ticket should consume the bounded runtime-mutation concept without opening the full developer/admin surface.resources/content/issues/chunk-3/issue-13064.md classifies harness-facing Neural Link tool projection as read / write-locked / admin, and warns that embedded harness agents must not inherit the full developer surface by default.resources/content/issues/chunk-3/issue-13221.md preserves undo/redo and transaction-stack work as separate Neural Link substrate. This ticket may depend on those affordances if they are available, but it should not reimplement them.learn/agentos/HarnessDockZoneModel.md separates runtime component ownership from persistence. It treats persisted item.blueprint and saved layouts as their own JSON-first model boundary, so durable persistence/write-through remains a later H2 child.
The Fix
Add a one-PR H2 child slice that lets the AgentOS widget child app accept bounded follow-up edit requests after the initial first-widget request is captured.
Expected shape:
- Reuse the request/transcript/evidence surface from #13357 instead of creating a second chat path.
- Parse a small deterministic edit grammar over the first widget, for example "rename it to ", "show 8 rows", "hide/show column <name>", or "reset sample data".</li>
<li>Apply accepted edits to the existing first-widget blueprint/runtime state from <a href="#/news/tickets/13353">#13353</a> rather than creating a replacement widget or a second hardcoded demo path.</li>
<li>Reflect accepted and rejected edit attempts in the evidence/transcript surface from <a href="#/news/tickets/13355">#13355</a>.</li>
<li>Fail closed for unknown edit commands, overlong input, HTML-like input, invalid row/column bounds, and missing prerequisite widget state.</li>
<li>Keep provider invocation, streaming orchestration, Memory Core persistence, saved layouts, Node-git write-through, and Electron shell work out of scope.</li>
</ul>
<h2 class="neo-h2" data-record-id="6">Contract Ledger Matrix</h2><div class="neo-markdown-table-wrapper"><table>
<thead>
<tr>
<th>Target Surface</th>
<th>Source of Authority</th>
<th>Proposed Behavior</th>
<th>Fallback</th>
<th>Docs</th>
<th>Evidence</th>
</tr>
</thead>
<tbody><tr>
<td>First-widget follow-up edit surface</td>
<td><a href="#/news/tickets/13349">#13349</a>, ADR 0020, <a href="#/news/tickets/13357">#13357</a></td>
<td>Accepts bounded edit requests after first-widget intake exists</td>
<td>Unknown or unsafe commands render a bounded rejection state</td>
<td>JSDoc / @summary on parsing and projection helpers</td>
<td>Unit tests plus local render smoke</td>
</tr>
<tr>
<td>Edit grammar -> widget state projection</td>
<td><a href="#/news/tickets/13353">#13353</a> blueprint contract</td>
<td>Mutates the existing first-widget blueprint/runtime state without creating a parallel widget path</td>
<td>Invalid bounds or missing widget state preserve current widget and surface an error</td>
<td>Helper docs name accepted fields and limits</td>
<td>Unit tests for each accepted edit and fail-closed branch</td>
</tr>
<tr>
<td>Harness-visible mutation authority</td>
<td><a href="#/news/tickets/13064">#13064</a>, Neural Link docs</td>
<td>Uses only bounded app-runtime mutation semantics appropriate for harness embedding</td>
<td>If write-locked substrate is unavailable, keep mutation local to deterministic state and name the residual</td>
<td>PR body evidence</td>
<td>Source assertion or test proving no admin/full-developer surface is exposed</td>
</tr>
<tr>
<td>Transcript/evidence reflection</td>
<td><a href="#/news/tickets/13355">#13355</a> safe evidence surface</td>
<td>Shows accepted/rejected edit attempts without unsafe rendering</td>
<td>Unsafe text remains escaped / bounded</td>
<td>Component/helper summary</td>
<td>Unit/source assertion for no unsafe HTML path</td>
</tr>
</tbody></table></div>
<h2 class="neo-h2" data-record-id="7">Decision Record impact</h2><p>Aligned with ADR 0020. No ADR amendment expected; this ticket implements the "live-mutable" part of the H2 canonical demo without changing product ordering, source placement, Neural Link authority tiering, or persistence boundaries.</p>
<h2 class="neo-h2" data-record-id="8">Acceptance Criteria</h2><ul>
<li><input disabled="" type="checkbox"> The AgentOS widget child app exposes bounded follow-up edit submission after <a href="#/news/tickets/13357">#13357</a>'s first-widget request intake path exists.</li>
<li><input disabled="" type="checkbox"> Accepted edit commands mutate the existing first-widget blueprint/runtime state from <a href="#/news/tickets/13353">#13353</a> rather than creating a replacement widget or duplicate demo path.</li>
<li><input disabled="" type="checkbox"> At least two deterministic edits are supported, one label/title edit and one grid-shape/data edit.</li>
<li><input disabled="" type="checkbox"> Unknown commands, overlong input, HTML-like input, invalid row/column bounds, and missing prerequisite widget state fail closed to bounded visible states.</li>
<li><input disabled="" type="checkbox"> Accepted and rejected edit attempts appear in the transcript/evidence surface from <a href="#/news/tickets/13355">#13355</a> without unsafe HTML rendering.</li>
<li><input disabled="" type="checkbox"> The implementation does not call an LLM provider, persist transcript/widget state, write through to git, expose admin Neural Link tools, or introduce Electron shell/build-root behavior.</li>
<li><input disabled="" type="checkbox"> Focused unit coverage verifies accepted edits, rejected edits, blueprint-path reuse, safe rendering, and no duplicate widget path.</li>
<li><input disabled="" type="checkbox"> Local render smoke verifies initial intake, transcript/evidence, live widget, and follow-up edit surfaces work together after prerequisites land.</li>
</ul>
<h2 class="neo-h2" data-record-id="9">Out of Scope</h2><ul>
<li>Natural-language model invocation or streaming chat orchestration.</li>
<li>Durable transcript or widget persistence.</li>
<li>Saved dock-zone layouts or <code>item.blueprint</code> write-through.</li>
<li>Node-git commit/write-through flows.</li>
<li>Generic Neural Link admin tool exposure or tool-surface curation.</li>
<li>Multi-writer locking or undo/redo substrate implementation; those remain <a href="#/news/tickets/13056">#13056</a> / <a href="#/news/tickets/13221">#13221</a>-adjacent lanes.</li>
<li>Electron shell/build-root work; that remains <a href="#/news/tickets/13033">#13033</a>.</li>
<li>Partner-private workflows or client-specific UI.</li>
</ul>
<h2 class="neo-h2" data-record-id="10">Avoided Traps / Gold Standards Rejected</h2><ul>
<li><strong>Static one-shot widget:</strong> rejected. H2 must show that the widget remains live-mutable after creation.</li>
<li><strong>Arbitrary code generation/editing:</strong> rejected. The first edit path uses a bounded grammar over known widget state.</li>
<li><strong>Full Neural Link developer surface in the harness:</strong> rejected. Harness-embedded mutation must not imply admin capability.</li>
<li><strong>Persistence bundled too early:</strong> rejected. Runtime edit and durable write-through are different boundaries.</li>
<li><strong>Duplicate Electron support:</strong> rejected. <a href="#/news/tickets/13033">#13033</a> remains the canonical Electron shell/build-root lane.</li>
</ul>
<h2 class="neo-h2" data-record-id="11">Related</h2><p>Parent: <a href="#/news/tickets/13349">#13349</a>.
Grandparent: <a href="#/news/tickets/13012">#13012</a>.
Blocked by <a href="#/news/tickets/13357">#13357</a>.
Prerequisite chain: <a href="#/news/tickets/13357">#13357</a> depends on <a href="#/news/tickets/13355">#13355</a>, which depends on <a href="#/news/tickets/13353">#13353</a> / PR <a href="#/news/tickets/13354">#13354</a>.
Sibling lane: <a href="#/news/tickets/13033">#13033</a> remains the Electron shell/build-root lane.
ADR: <code>learn/agentos/decisions/0020-agent-harness-concept.md</code>.</p>
<h2 class="neo-h2" data-record-id="12">Duplicate / Claim Sweep</h2><p>Live latest-open sweep: checked the latest 20 open issues immediately before creation on 2026-06-15T15:55:04Z. Relevant results were <a href="#/news/tickets/13349">#13349</a>, <a href="#/news/tickets/13353">#13353</a>, <a href="#/news/tickets/13355">#13355</a>, <a href="#/news/tickets/13357">#13357</a>, <a href="#/news/tickets/13012">#13012</a>, <a href="#/news/tickets/13033">#13033</a>, <a href="#/news/tickets/13056">#13056</a>, <a href="#/news/tickets/13221">#13221</a>, <a href="#/news/tickets/13287">#13287</a>, and unrelated backlog issues; no equivalent first-widget live-edit / mutation child leaf was present.</p>
<p>Targeted live GitHub searches: <code>"first-widget live edit"</code>, <code>"first-widget mutation"</code>, and <code>"H2 widget edit"</code> returned no open duplicate.</p>
<p>A2A in-flight sweep: native <code>list_messages</code> / <code>add_message</code> tools are not exposed in this Codex Desktop surface (<code>tool_search</code> returned 0 this turn). I could not inspect private in-flight A2A claims from this harness. Public GitHub issue/PR state and repo content were checked immediately before filing, and no public duplicate or collision was visible.</p>
<p>Semantic KB sweep: <code>ask_knowledge_base(query='Agent Harness H2 first widget live mutation edit path blueprint chat intake persistence write-through', type='all')</code> surfaced ADR 0020, Neural Link, and HarnessDockZoneModel context; it confirmed live mutation/edit and persistence/write-through are distinct H2 boundaries.</p>
<p>Exact repo/content sweep: <code>rg "first-widget live edit|first widget live edit|follow-up edit|widget edit command|live widget mutation|H2 widget edit" resources/content/issues resources/content/discussions .agents/workflows learn apps/agentos -n</code> returned no existing child ticket.</p>
<p>Origin Session ID: 019ec8a7-1f8e-75a3-b223-fe59cc444776</p>
<p>Retrieval Hint: "Agent Harness H2 first-widget live edit bounded follow-up request mutation blueprint reuse no persistence no write-through"</p>
</div>
</div>
</div>
<div id="timeline-13361-1" class="neo-timeline-item event" data-record-id="timeline-13361-1">
<div id="timeline-13361-1-target" class="neo-timeline-badge" ><i class="fa-solid fa-link"></i></div>
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<a class="neo-timeline-user" href="https://github.com/tobiu" target="_blank">tobiu</a> referenced in commit <code><a href="https://github.com/neomjs/neo/commit/b759ab1" target="_blank">b759ab1</a></code> - "feat(agentos): live-mutate the first widget via bounded follow-up edits (#13361) (#13451) <span class="neo-timeline-date">on Jun 17, 2026, 1:10 PM</span>
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<a class="neo-timeline-user" href="https://github.com/tobiu" target="_blank">tobiu</a> closed this issue <span class="neo-timeline-date">on Jun 17, 2026, 1:10 PM</span>
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Context
Epic #13349 owns the Agent Harness H2 path: chat/work surface -> constrained blueprint -> live first Neo widget. The current child chain covers the first rendered widget (#13353 / PR #13354), visible transcript / accepted-blueprint evidence (#13355), and safe first-widget request intake (#13357).
ADR 0020 and #13012 both make the next product promise explicit: the first widget must be live-mutable after it appears, not just generated once. ADR 0020 states the canonical demo as
"build me a neo grid" -> a pane that becomes its own window, live-mutable; #13012 states that the standalone harness mutates itself through the same Neural Link mechanism it uses to build apps.Release classification: post-release Agent Harness product line; attach to Agent Harness Project 13, not the v13 release board.
The Problem
After #13357, the user can submit the canonical first-widget request and see deterministic widget provenance. That still stops short of the H2 proof if the result cannot be changed through the same conversational surface. A static first widget is a better demo, not yet a co-inhabited live object.
This ticket owns the next small proof: bounded follow-up requests mutate the existing first-widget state. The slice must stay constrained and reversible in shape. It should accept only a small, explicit edit grammar over the first widget, such as title, row count, column visibility, or sample-data reset. It must not introduce arbitrary code execution, generic provider orchestration, durable persistence, or Node-git write-through.
The Architectural Reality
learn/agentos/decisions/0020-agent-harness-concept.mdnames pillar 2 as conversational app creation and the canonical demo as chat -> live blueprint emission -> live-mutable grid pane.resources/content/issues/chunk-2/issue-13012.mdnames runtime mutation via Neural Link and separately names NL-mutation-to-commit write-through onto Node-git. Those are related but not the same leaf.learn/agentos/NeuralLink.mdlists constrained runtime mutation tools such asset_instance_properties,create_component,remove_component,undo, andredo. This ticket should consume the bounded runtime-mutation concept without opening the full developer/admin surface.resources/content/issues/chunk-3/issue-13064.mdclassifies harness-facing Neural Link tool projection as read / write-locked / admin, and warns that embedded harness agents must not inherit the full developer surface by default.resources/content/issues/chunk-3/issue-13221.mdpreserves undo/redo and transaction-stack work as separate Neural Link substrate. This ticket may depend on those affordances if they are available, but it should not reimplement them.learn/agentos/HarnessDockZoneModel.mdseparates runtime component ownership from persistence. It treats persisteditem.blueprintand saved layouts as their own JSON-first model boundary, so durable persistence/write-through remains a later H2 child.The Fix
Add a one-PR H2 child slice that lets the AgentOS widget child app accept bounded follow-up edit requests after the initial first-widget request is captured.
Expected shape: