feat(core): compile-time media feature gate (media_generation + image) (#4804)

[oxoxDev]

Summary

• Adds a compile-time Cargo media feature (default-ON) that gates the media_generation (media_generate_* agent tools) + image domains, composing with the runtime DomainSet::media flag from feat(core): DomainSet on CoreBuilder + DomainRegistration filter seam (feature-gate prerequisite) #4796.
• Default build is byte-identical — the desktop/CLI app is unchanged. A slim build drops the media tools + their modules from the compile.
• Leaf-gate variant of the feat(core): feature gate — voice #4803 pathfinder: media_generation has a single caller and image is unwired scaffold, so no stub facade is needed — both modules are plain #[cfg(feature = "media")] pub mod … and the one call site is #[cfg]'d.

Problem

#4795 wants one compile-time feature gate per subsystem family so slim harness builds drop code + deps; #4796 shipped the runtime DomainSet axis. This PR adds the compile-time half for media. Two scope realities the issue over-stated, confirmed by a full sweep:

• Sheds no dependencies. Media generation is backend-proxied (image/video via GMI over reqwest, shared) and the image crate is shared with channel media upload — neither is exclusive to the gated domains. This is a surface-only gate (drops the tool code + modules), not a dependency-shedding one. The issue's "sheds media processing dependencies" DoD line is superseded.
• No controllers / stores / subscribers. Media is agent-tools-only — nothing is tagged DomainGroup::Media in src/core/all.rs beyond the media_generate_* tools. The "controllers unregistered / stores not initialized / subscribers not registered" DoD lines don't apply.
• image is dead scaffold — added in feat(image): add image tool contracts #2997 ("image tool contracts"), wired to nothing (zero consumers). Folded under the gate per issue scope; gating it is cosmetic.

Solution

• Cargo.toml: new media = [] feature (no dep: — no exclusive crate), added to default.
• Facade-free leaf gate: src/openhuman/mod.rs marks pub mod media_generation; and pub mod image; as #[cfg(feature = "media")]; the single consumer (build_media_tools extend in src/openhuman/tools/ops.rs) is #[cfg(feature = "media")]. The remaining media_generation references are doc-comments only (src/openhuman/file_storage/tools.rs), so nothing else needs a cfg.
• CI: the existing rust-feature-gate-smoke lane already builds --no-default-features --features tokenjuice-treesitter (which turns every default gate off), so it covers this gate too — updated its name + comment; no new step needed.
• Tests: media_tools_registered_when_feature_on (default build) and media_tools_absent_when_feature_off (disabled build) assert the on/off behavior.
• Docs: AGENTS.md gains a media row + a "leaf-gate variant" note contrasting it with the voice stub-facade.

When off: the media_generate_image/video + media_list_models agent tools are absent from the tool list; the media_generation + image modules are excluded from the build.

Submission Checklist

• Tests added or updated (happy path + at least one failure / edge case) per Testing Strategy
• N/A: no instrumented changed lines — the diff is compile-config only (#[cfg] attrs, a media = [] feature, docs, CI yaml). diff-cover reports no lines with coverage information; the two new registration tests cover the on/off behavior. CI coverage-gate authoritative. — Diff coverage ≥ 80%
• Coverage matrix updated — N/A: compile-time build-config change, no user-facing feature row
• All affected feature IDs from the matrix are listed in the PR description under ## Related — N/A: no matrix rows affected
• No new external network dependencies introduced (mock backend used per Testing Strategy)
• N/A: default build is byte-identical; the gate only removes surface when explicitly disabled — Manual smoke checklist
• Linked issue closed via Closes #NNN in the ## Related section

Impact

• Desktop / CLI / mobile / web: no behavior change — default build keeps media on and is byte-identical.
• Slim builds: --no-default-features (without media) drops the media_generate_* tools + the media_generation/image modules. No deps shed (image crate + reqwest are shared).
• Security / migration: none. Additive, default-preserving.

Related

• Closes: feat(core): feature gate — media generation #4804
• Epic: Feature gates for core subsystems — tracking (lightweight harness builds) #4795 (Milestone M1). Composes with the feat(core): DomainSet on CoreBuilder + DomainRegistration filter seam (feature-gate prerequisite) #4796 runtime DomainSet seam. Follows the feat(core): feature gate — voice #4803 voice pathfinder (PR feat(core): compile-time voice feature gate (voice + audio_toolkit) (#4803) #4833); demonstrates the facade-free leaf-gate variant. Tool/controller gating convergence follow-up: feat(core): converge tool gating with controller gating via per-Tool DomainGroup metadata #4821.

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AI Authored PR Metadata (required for Codex/Linear PRs)

Linear Issue

• Key: N/A
• URL: N/A

Commit & Branch

• Branch: feat/4804-media-feature-gate
• Commit SHA: 910c0877697d73c3dca370f4c0859c287a73d802

Validation Run

• N/A: no app/ (frontend) changes — pnpm --filter openhuman-app format:check
• N/A: no TypeScript changes — pnpm typecheck
• Focused tests: openhuman::tools::ops::tests::media_tools_registered_when_feature_on (default, passed) + ..::media_tools_absent_when_feature_off (disabled build, passed)
• Rust fmt/check: cargo fmt --check clean · default cargo check exit 0 · disabled cargo check --no-default-features --features tokenjuice-treesitter exit 0 · cargo clippy --lib 0 warnings in changed files (both configs)
• N/A: no app/src-tauri changes — Tauri fmt/check

Validation Blocked

• command: cargo test --lib (full)
• error: OOM on local machine (known)
• impact: full matrix runs in CI; locally scoped to the two media gate tests + default/disabled cargo check — all green in both feature configs

Behavior Changes

• Intended behavior change: new default-on media compile-time gate; default unchanged
• User-visible effect: none by default; slim builds omit the media-generation agent tools + modules

Summary by CodeRabbit

• New Features

  • Added a compile-time media feature to enable image and media-generation tools.
  • Media capabilities are now enabled by default, and can be excluded from slim/headless builds.
  • Desktop shell builds now properly forward the media capability so media tools show up when enabled.

• Documentation

  • Updated feature-gate documentation to clarify media vs voice behavior and scope.

• Tests

  • Added feature-gated test coverage to confirm media tools appear when enabled and are omitted when disabled.

• Chores

  • Adjusted CI “feature-gate smoke” messaging to reflect both voice and media being disabled together.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 2d7d8347-688b-4eb7-9d50-8aa33e77ac7f

📥 Commits

Reviewing files that changed from the base of the PR and between 2174e7c and e4b9b76.

📒 Files selected for processing (3)

• Cargo.toml
• app/src-tauri/Cargo.toml
• tests/raw_coverage/agent_session_round24_raw_coverage_e2e.rs

📝 Walkthrough

Walkthrough

The PR adds a media Cargo feature, enables it by default, gates media modules and tool registration at compile time, forwards the feature to the Tauri shell, updates documentation and CI guidance, and adds enabled/disabled tool-surface tests.

Changes

Media feature gate

Layer / File(s)	Summary
Feature contract and build guidance Cargo.toml, AGENTS.md, .github/workflows/ci-lite.yml	Adds and documents the media feature, enables it by default, and updates CI smoke-lane descriptions for disabled voice and media gates.
Media module compilation src/openhuman/mod.rs	Compiles the image and media_generation modules only when the media feature is enabled.
Media tool registration and validation src/openhuman/tools/ops.rs, src/openhuman/tools/ops_tests.rs	Gates media tool registration at compile time and tests tool presence with the feature enabled and absence when disabled.
Desktop feature forwarding app/src-tauri/Cargo.toml	Forwards the media feature to the embedded core dependency used by the Tauri shell.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• tinyhumansai/openhuman#4808 — changes runtime media tool filtering in the same registration path.

Suggested labels: rust-core, feature

Suggested reviewers: github-actions[bot], senamakel, m3ga-mind

Poem

I’m a rabbit with a feature flag,
Media tools hop in when built.
Slim builds leave them in the burrow,
Tests check every gate is shut.
Carrots all around! 🐇

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the PR's main change: adding a compile-time media feature gate for media_generation and image.
Linked Issues check	✅ Passed	The PR implements the default-on media feature, gates media_generation/image and tools, adds tests, CI smoke, and docs, matching #4804.
Out of Scope Changes check	✅ Passed	The changes stay focused on the media gate, related docs, tests, CI, and feature forwarding without unrelated scope creep.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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[chatgpt-codex-connector]

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[M3gA-Mind]

Maintainer fix pass (pushed e4b9b76ed):

CI — Rust Core Coverage was RED (and PR CI Gate red as its aggregator). Root cause was a stale, pre-existing test unrelated to this media gate: agent_session_round24_raw_coverage_e2e::max_iteration_checkpoint_uses_deterministic_fallback_and_hooks. It fed the tool-call-cap wrap-up call a non-empty response (tool-call XML text) plus a streamed "checkpoint delta", so summarize_turn_wrapup returned that text as the checkpoint and the deterministic fallback the test is named for never executed — the (1 steps) assertion failed. The checkpoint-selection logic (response.text() non-empty wins → else streamed → else empty→fallback) predates #4386, so the test only fails in the FULL instrumented suite, which this PR triggers via its Cargo.toml change (media feature); it doesn't gate normal main pushes, so the drift went unnoticed.

Fix (tests/raw_coverage/agent_session_round24_raw_coverage_e2e.rs): make the wrap-up genuinely empty (text_response("", None), no stream deltas) so build_deterministic_checkpoint becomes the answer — restoring the path the test name promises. Updated the trailing progress assertion to expect no iteration-2 wrap-up delta (nothing streams now), and refreshed a stale digest-format comment. Robust by construction: an empty summary always routes to the deterministic fallback regardless of stream plumbing. All other assertions (hooks, requests.len()==2, stream_was_requested, tools-disabled, tool count) are unchanged. No production code touched — the media gate itself is untouched.

Review feedback: none outstanding — reviewDecision is unblocked and CodeRabbit's latest review is APPROVED; no open actionable inline comments.

[M3gA-Mind]

Re @chatgpt-codex-connector's P1 "Keep media enabled for the embedded desktop core" — already addressed in current HEAD. app/src-tauri/Cargo.toml:143 now forwards the new gate:

openhuman_core = { path = "../..", package = "openhuman", default-features = false, features = ["media"] }

with a comment explaining that default-features = false (from #1061) means each default-ON gate must be forwarded explicitly. This restores media_generate_image / media_generate_video / media_list_models in the shipped desktop build (pnpm dev:app, cargo tauri build, and the E2E desktop build), so the embedded core's tool surface stays byte-identical to pre-gate. Verified the change is purely additive (main's dep forwarded no features), and Rust Feature-Gate Smoke gates off + Rust Tauri Coverage are both green. Good catch — the fix landed before this pass.

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[M3gA-Mind]

Reviewed — CI green and all CodeRabbit/Codex review threads resolved. Approving.

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🤖 Council Merge Gate — APPROVE (merge failed)

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