diff --git a/bin/install.js b/bin/install.js
index 9a5f39a22..8d5543107 100755
--- a/bin/install.js
+++ b/bin/install.js
@@ -589,6 +589,27 @@ function writeSettings(settingsPath, settings) {
   fs.writeFileSync(settingsPath, JSON.stringify(settings, null, 2) + '\n');
 }
 
+/**
+ * Read model_overrides from ~/.gsd/defaults.json at install time.
+ * Returns an object mapping agent names to model IDs, or null if the file
+ * doesn't exist or has no model_overrides entry.
+ * Used by Codex TOML and OpenCode agent file generators to embed per-agent
+ * model assignments so that model_overrides is respected on non-Claude runtimes (#2256).
+ */
+function readGsdGlobalModelOverrides() {
+  try {
+    const defaultsPath = path.join(os.homedir(), '.gsd', 'defaults.json');
+    if (!fs.existsSync(defaultsPath)) return null;
+    const raw = fs.readFileSync(defaultsPath, 'utf-8');
+    const parsed = JSON.parse(raw);
+    const overrides = parsed.model_overrides;
+    if (!overrides || typeof overrides !== 'object') return null;
+    return overrides;
+  } catch {
+    return null;
+  }
+}
+
 // Cache for attribution settings (populated once per runtime during install)
 const attributionCache = new Map();
 
@@ -1748,7 +1769,7 @@ purpose: ${toSingleLine(description)}
  * Sets required agent metadata, sandbox_mode, and developer_instructions
  * from the agent markdown content.
  */
-function generateCodexAgentToml(agentName, agentContent) {
+function generateCodexAgentToml(agentName, agentContent, modelOverrides = null) {
   const sandboxMode = CODEX_AGENT_SANDBOX[agentName] || 'read-only';
   const { frontmatter, body } = extractFrontmatterAndBody(agentContent);
   const frontmatterText = frontmatter || '';
@@ -1762,12 +1783,22 @@ function generateCodexAgentToml(agentName, agentContent) {
     `name = ${JSON.stringify(resolvedName)}`,
     `description = ${JSON.stringify(resolvedDescription)}`,
     `sandbox_mode = "${sandboxMode}"`,
-    // Agent prompts contain raw backslashes in regexes and shell snippets.
-    // TOML literal multiline strings preserve them without escape parsing.
-    `developer_instructions = '''`,
-    instructions,
-    `'''`,
   ];
+
+  // Embed model override when configured in ~/.gsd/defaults.json so that
+  // model_overrides is respected on Codex (which uses static TOML, not inline
+  // Task() model parameters). See #2256.
+  const modelOverride = modelOverrides?.[resolvedName] || modelOverrides?.[agentName];
+  if (modelOverride) {
+    lines.push(`model = ${JSON.stringify(modelOverride)}`);
+  }
+
+  // Agent prompts contain raw backslashes in regexes and shell snippets.
+  // TOML literal multiline strings preserve them without escape parsing.
+  lines.push(`developer_instructions = '''`);
+  lines.push(instructions);
+  lines.push(`'''`);
+
   return lines.join('\n') + '\n';
 }
 
@@ -2991,7 +3022,10 @@ function installCodexConfig(targetDir, agentsSrc) {
 
     agents.push({ name, description: toSingleLine(description) });
 
-    const tomlContent = generateCodexAgentToml(name, content);
+    // Pass model overrides from ~/.gsd/defaults.json so Codex TOML files
+    // embed the configured model — Codex cannot receive model inline (#2256).
+    const modelOverrides = readGsdGlobalModelOverrides();
+    const tomlContent = generateCodexAgentToml(name, content, modelOverrides);
     fs.writeFileSync(path.join(agentsTomlDir, `${name}.toml`), tomlContent);
   }
 
@@ -3145,7 +3179,7 @@ function convertClaudeToGeminiAgent(content) {
   return `---\n${newFrontmatter}\n---${stripSubTags(neutralBody)}`;
 }
 
-function convertClaudeToOpencodeFrontmatter(content, { isAgent = false } = {}) {
+function convertClaudeToOpencodeFrontmatter(content, { isAgent = false, modelOverride = null } = {}) {
   // Replace tool name references in content (applies to all files)
   let convertedContent = content;
   convertedContent = convertedContent.replace(/\bAskUserQuestion\b/g, 'question');
@@ -3280,6 +3314,12 @@ function convertClaudeToOpencodeFrontmatter(content, { isAgent = false } = {}) {
   // use its default model for subagents. See #1156.
   if (isAgent) {
     newLines.push('mode: subagent');
+    // Embed model override from ~/.gsd/defaults.json so model_overrides is
+    // respected on OpenCode (which uses static agent frontmatter, not inline
+    // Task() model parameters). See #2256.
+    if (modelOverride) {
+      newLines.push(`model: ${modelOverride}`);
+    }
   }
 
   // For commands: add tools object if we had allowed-tools or tools
@@ -5682,7 +5722,11 @@ function install(isGlobal, runtime = 'claude') {
         content = processAttribution(content, getCommitAttribution(runtime));
         // Convert frontmatter for runtime compatibility (agents need different handling)
         if (isOpencode) {
-          content = convertClaudeToOpencodeFrontmatter(content, { isAgent: true });
+          // Resolve per-agent model override from ~/.gsd/defaults.json (#2256)
+          const _ocAgentName = entry.name.replace(/\.md$/, '');
+          const _ocModelOverrides = readGsdGlobalModelOverrides();
+          const _ocModelOverride = _ocModelOverrides?.[_ocAgentName] || null;
+          content = convertClaudeToOpencodeFrontmatter(content, { isAgent: true, modelOverride: _ocModelOverride });
         } else if (isKilo) {
           content = convertClaudeToKiloFrontmatter(content, { isAgent: true });
         } else if (isGemini) {
diff --git a/commands/gsd/inbox.md b/commands/gsd/inbox.md
new file mode 100644
index 000000000..a57684fe2
--- /dev/null
+++ b/commands/gsd/inbox.md
@@ -0,0 +1,38 @@
+---
+name: gsd:inbox
+description: Triage and review all open GitHub issues and PRs against project templates and contribution guidelines
+argument-hint: "[--issues] [--prs] [--label] [--close-incomplete] [--repo owner/repo]"
+allowed-tools:
+  - Read
+  - Bash
+  - Write
+  - Grep
+  - Glob
+  - AskUserQuestion
+---
+<objective>
+One-command triage of the project's GitHub inbox. Fetches all open issues and PRs,
+reviews each against the corresponding template requirements (feature, enhancement,
+bug, chore, fix PR, enhancement PR, feature PR), reports completeness and compliance,
+and optionally applies labels or closes non-compliant submissions.
+
+**Flow:** Detect repo → Fetch open issues + PRs → Classify each by type → Review against template → Report findings → Optionally act (label, comment, close)
+</objective>
+
+<execution_context>
+@~/.claude/get-shit-done/workflows/inbox.md
+</execution_context>
+
+<context>
+**Flags:**
+- `--issues` — Review only issues (skip PRs)
+- `--prs` — Review only PRs (skip issues)
+- `--label` — Auto-apply recommended labels after review
+- `--close-incomplete` — Close issues/PRs that fail template compliance (with comment explaining why)
+- `--repo owner/repo` — Override auto-detected repository (defaults to current git remote)
+</context>
+
+<process>
+Execute the inbox workflow from @~/.claude/get-shit-done/workflows/inbox.md end-to-end.
+Parse flags from arguments and pass to workflow.
+</process>
diff --git a/docs/ARCHITECTURE.md b/docs/ARCHITECTURE.md
index 6f04657dd..5d7c03d48 100644
--- a/docs/ARCHITECTURE.md
+++ b/docs/ARCHITECTURE.md
@@ -113,7 +113,7 @@ User-facing entry points. Each file contains YAML frontmatter (name, description
 - **Copilot:** Slash commands (`/gsd-command-name`)
 - **Antigravity:** Skills
 
-**Total commands:** 73
+**Total commands:** 74
 
 ### Workflows (`get-shit-done/workflows/*.md`)
 
@@ -409,7 +409,7 @@ UI-SPEC.md (per phase) ───────────────────
 
 ```
 ~/.claude/                          # Claude Code (global install)
-├── commands/gsd/*.md               # 73 slash commands
+├── commands/gsd/*.md               # 74 slash commands
 ├── get-shit-done/
 │   ├── bin/gsd-tools.cjs           # CLI utility
 │   ├── bin/lib/*.cjs               # 19 domain modules
diff --git a/tests/codex-config.test.cjs b/tests/codex-config.test.cjs
index f02db36f5..60f863dea 100644
--- a/tests/codex-config.test.cjs
+++ b/tests/codex-config.test.cjs
@@ -320,6 +320,35 @@ tools: Read, Grep, Glob
     const result = generateCodexAgentToml('gsd-unknown', sampleAgent);
     assert.ok(result.includes('sandbox_mode = "read-only"'), 'defaults to read-only');
   });
+
+  // ─── #2256: model_overrides support ───────────────────────────────────────
+
+  test('emits model field when modelOverrides contains an entry for the agent (#2256)', () => {
+    const overrides = { 'gsd-executor': 'gpt-5.3-codex' };
+    const result = generateCodexAgentToml('gsd-executor', sampleAgent, overrides);
+    assert.ok(result.includes('model = "gpt-5.3-codex"'), 'model field must be present in TOML');
+  });
+
+  test('does not emit model field when modelOverrides is null (#2256)', () => {
+    const result = generateCodexAgentToml('gsd-executor', sampleAgent, null);
+    assert.ok(!result.includes('model ='), 'model field must be absent when no override');
+  });
+
+  test('does not emit model field when modelOverrides has no entry for this agent (#2256)', () => {
+    const overrides = { 'gsd-planner': 'gpt-5.4' };
+    const result = generateCodexAgentToml('gsd-executor', sampleAgent, overrides);
+    assert.ok(!result.includes('model ='), 'model field must be absent for agents not in overrides');
+  });
+
+  test('model field appears before developer_instructions (#2256)', () => {
+    const overrides = { 'gsd-executor': 'gpt-5.3-codex' };
+    const result = generateCodexAgentToml('gsd-executor', sampleAgent, overrides);
+    const modelIdx = result.indexOf('model = "gpt-5.3-codex"');
+    const instrIdx = result.indexOf("developer_instructions = '''");
+    assert.ok(modelIdx !== -1, 'model field present');
+    assert.ok(instrIdx !== -1, 'developer_instructions present');
+    assert.ok(modelIdx < instrIdx, 'model field must appear before developer_instructions');
+  });
 });
 
 // ─── CODEX_AGENT_SANDBOX mapping ────────────────────────────────────────────────
diff --git a/tests/runtime-converters.test.cjs b/tests/runtime-converters.test.cjs
index a8803c598..dcffa9924 100644
--- a/tests/runtime-converters.test.cjs
+++ b/tests/runtime-converters.test.cjs
@@ -184,6 +184,48 @@ Fallback skills live in .agents/skills/.`;
       assert.ok(frontmatter.includes('description:'), 'description should be kept');
     });
   });
+
+  // ─── #2256: model_overrides support for OpenCode/Kilo agents ────────────────
+  // Only test OpenCode — Kilo uses the same converter but model override injection
+  // is wired only for OpenCode at the call site in install().
+  if (label === 'OpenCode') {
+    describe('OpenCode agent model override (modelOverride option) (#2256)', () => {
+      test('adds model: field when modelOverride is provided', () => {
+        const result = convert(SAMPLE_AGENT, { isAgent: true, modelOverride: 'gpt-5.3-codex' });
+        const frontmatter = result.split('---')[1];
+        assert.ok(frontmatter.includes('model: gpt-5.3-codex'), 'model: field must be added with override value');
+      });
+
+      test('does not add model: field when modelOverride is null', () => {
+        const result = convert(SAMPLE_AGENT, { isAgent: true, modelOverride: null });
+        const frontmatter = result.split('---')[1];
+        assert.ok(!frontmatter.includes('model:'), 'model: field must be absent when no override');
+      });
+
+      test('does not add model: field when modelOverride is omitted', () => {
+        const result = convert(SAMPLE_AGENT, { isAgent: true });
+        const frontmatter = result.split('---')[1];
+        assert.ok(!frontmatter.includes('model:'), 'model: field must be absent when option omitted');
+      });
+
+      test('model: field appears after mode: subagent', () => {
+        const result = convert(SAMPLE_AGENT, { isAgent: true, modelOverride: 'o4-mini' });
+        const frontmatter = result.split('---')[1];
+        const modeIdx = frontmatter.indexOf('mode: subagent');
+        const modelIdx = frontmatter.indexOf('model: o4-mini');
+        assert.ok(modeIdx !== -1, 'mode: subagent must be present');
+        assert.ok(modelIdx !== -1, 'model: field must be present');
+        assert.ok(modelIdx > modeIdx, 'model: must appear after mode: subagent');
+      });
+
+      test('model override does not affect command conversion', () => {
+        // modelOverride has no effect when isAgent is false (commands)
+        const result = convert(SAMPLE_COMMAND, { modelOverride: 'gpt-5.4' });
+        const frontmatter = result.split('---')[1];
+        assert.ok(!frontmatter.includes('model:'), 'model: must not appear in command output');
+      });
+    });
+  }
 }
 
 // ─────────────────────────────────────────────────────────────────────────────