Codestin Search App

ibetitsmike · 2026-04-16T19:10:54Z

This PR was authored by Mux on behalf of Mike.

Introduce Explore mode, a read-only subagent modality for delegated
discovery and code investigation.

What

Adds a spawn_explore_agent tool that creates child chats restricted to
read-only operations. An admin can optionally configure a deployment-wide
model override so Explore subagents use a model optimized for large context
or reasoning without changing the root chat's model.

Backend

New ChatModeExplore enum value (migration 000471).
spawn_explore_agent tool definition with read-only allowlist:
read_file, execute, process_output, read_skill, read_skill_file.
Write tools, file editors, and nested subagent spawning are blocked.
Deployment config storage for the Explore model override
(agents_chat_explore_model_override in site_configs).
Model resolution hierarchy: configured override, then current turn model,
then global default. Silent fallback with warning log when the override
becomes unavailable.
RBAC: AsChatd for daemon reads, ActionRead and ActionUpdate on
ResourceDeploymentConfig for admin API calls.
Plan mode root chats can use spawn_explore_agent for read-only research,
matching the planning prompt guidance.
The Explore override config API now reports malformed saved overrides as
"treated as unset" so admins can clear them explicitly.

Frontend

ExploreModelOverrideSettings component in admin agent behavior settings.
Uses ModelSelector, handles unavailable model warnings, and supports
explicit Save and Clear actions.
Malformed saved overrides show a warning and require an explicit Save to
clear, instead of Clear auto-submitting behind the scenes.

Tests

Integration: TestExploreSubagentIsReadOnly (full spawn flow, tool
verification, prompt overlay, DB state).
Unit: tool allowlist tests for explore, plan, and default modes.
Internal: model override resolution with valid, invalid UUID, disabled, and
unconfigured override scenarios.
RBAC: dbauthz_test.go for GetChatExploreModelOverride and
UpsertChatExploreModelOverride.
API: admin set and clear, malformed stored override reporting, disabled
model rejection, non-admin denial.

Introduce Explore mode for delegated read-only research subagents: - Add 'explore' to chat_mode ENUM (migration 000471) - Add deployment-config storage for Explore model override - Implement spawn_explore_agent tool with read-only allowlist - Add behavior-profile resolver for model selection hierarchy - Harden RBAC: use AsChatd for daemon reads, ActionRead/ActionUpdate for admin API calls - Add admin UI component for Explore model override settings - Add integration tests for subagent spawning and tool filtering

ibetitsmike · 2026-04-16T19:11:19Z

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ibetitsmike · 2026-04-16T19:38:57Z

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ibetitsmike · 2026-04-16T20:02:29Z

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…re selector

ibetitsmike · 2026-04-17T06:57:56Z

@codex review

ibetitsmike · 2026-04-17T06:57:57Z

Mux is working on behalf of Mike.

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…e getter

ibetitsmike · 2026-04-17T07:16:46Z

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Mux is working on behalf of Mike.

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ibetitsmike · 2026-04-17T07:28:25Z

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Mux is working on behalf of Mike.

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ibetitsmike · 2026-04-17T07:43:37Z

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chatgpt-codex-connector · 2026-04-17T07:57:14Z

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ibetitsmike added 3 commits April 16, 2026 18:31

fix(coderd): tighten explore mode checks

15163b8

fix(coderd/x/chatd): allow root plan explore agents

26f03cf

github-actions Bot assigned ibetitsmike Apr 16, 2026

ibetitsmike changed the title ~~feat(coderd/x/chatd): add Explore mode as subagent-only modality~~ feat: add Explore mode as subagent-only modality Apr 16, 2026

chatgpt-codex-connector Bot reviewed Apr 16, 2026

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Comment thread coderd/exp_chats.go Outdated

Comment thread coderd/exp_chats.go

fix(coderd): harden explore model override handling

55b71fe

chatgpt-codex-connector Bot reviewed Apr 16, 2026

View reviewed changes

Comment thread coderd/exp_chats.go

fix(coderd): align explore override auth

16d0cf2

chatgpt-codex-connector Bot reviewed Apr 16, 2026

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Comment thread coderd/x/chatd/subagent.go

ibetitsmike added 3 commits April 16, 2026 20:42

fix(site): fallback Explore selector labels when display names are empty

32d43a4

fix(site/src): move Explore settings into Agents page

0989be9

fix(site/src): add border to Explore settings dropdown

484434b

ibetitsmike requested a review from DanielleMaywood April 17, 2026 06:53

fix(site/src/pages/AgentsPage/components): use input border for Explo…

1536eea

…re selector

chatgpt-codex-connector Bot reviewed Apr 17, 2026

View reviewed changes

Comment thread coderd/database/dbauthz/dbauthz.go Outdated

ibetitsmike added 2 commits April 17, 2026 07:09

fix(coderd/x/chatd): fall back when Explore override lacks credentials

b085343

fix(coderd/database/dbauthz): require read access for Explore overrid…

a8f0e28

…e getter

chatgpt-codex-connector Bot reviewed Apr 17, 2026

View reviewed changes

Comment thread coderd/database/dbauthz/dbauthz.go

Comment thread site/src/pages/AgentsPage/components/ChatElements/ModelSelector.test.tsx Outdated

fix: align Explore override auth and coverage

4090169

ThomasK33 approved these changes Apr 17, 2026

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chatgpt-codex-connector Bot reviewed Apr 17, 2026

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Comment thread site/src/pages/AgentsPage/components/ExploreModelOverrideSettings.tsx

fix(site/src/pages/AgentsPage): allow explicit clear of Explore override

a934c0a

DanielleMaywood reviewed Apr 17, 2026

View reviewed changes

Comment thread site/src/pages/AgentsPage/components/ExploreModelOverrideSettings.tsx Outdated

Comment thread site/src/pages/AgentsPage/components/ExploreModelOverrideSettings.tsx Outdated

fix: clear malformed Explore overrides explicitly

d07cf69

ibetitsmike merged commit 73b5058 into main Apr 17, 2026
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ibetitsmike deleted the explore-mode-p6s4 branch April 17, 2026 11:40

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