[iceblue03]

Summary

Omitting project in gflow_generate_image / gflow_generate_video has always meant "create a scratch project" via labs.google's project.createProject. On an account Google has migrated to flow.google.com, project creation isn't ported there yet (#791/#639), so that create call 401s unconditionally — surfaced to the caller as "Authentication expired" / "run gflow auth login", which is misleading: re-authenticating cannot fix a request to an unported endpoint.

Adds GFLOW_CLI_DEFAULT_PROJECT_ID: when a generate call omits project, both tools now fall back to this existing project id instead of attempting scratch creation. An explicit project argument still wins. The value is validated against the same allowlist as --project (ids get interpolated into navigation URLs/selectors), so a malformed value fails closed at config load rather than reaching a selector.

Scope note (read before reviewing): this is MCP-only. cli_image.py / cli_video.py resolve --project-omission synchronously in the CLI command itself, not through Settings.default_project_id, so gflow image t2i (no --project) does not get this fallback today. Giving the CLI the same behavior is a separate, not-yet-implemented follow-up — flagging it now rather than leaving it for a reviewer to discover, since AGENTS.md's MCP/CLI parity rule would otherwise call this out anyway.

Lifecycle

• Issue triaged with issue-assessment — no issue filed; found directly while exercising gflow_generate_image over MCP against a migrated account.
• predict verdict — not applicable; no transport/auth/selector/schema surface changes. This only changes which project id an existing, already-ported code path receives.
• scenario + plan — skipped for a change this narrow; happy to write these up if wanted before merge.
• check (scoped) — ruff check, ruff format --check, and pyright pass clean on all 4 touched files. Did not run the full repo-wide hygiene/doc-link/coverage suite from a fork checkout.
• MCP twin — this is the MCP-side twin of the CLI's --project concept; see the scope note above for the honest state of the other direction.
• E2E evidence — no tests/e2e/ test covers this specifically (it's a value-substitution before an existing, already-e2e-covered project-creation call, not a new DOM/network surface). Coverage is 4 new focused tests: tests/test_config.py::TestDefaultProjectId (default None; accepts a valid id; rejects 5 injection-shaped values) and tests/mcp/test_tools_wired.py::test_image_omitted_project_falls_back_to_configured_default (asserts create_project is never awaited when the default resolves). 97 passed locally across both files.
• Live-verified — done at authorship time, stated in the commit: an MCP gflow_generate_image call with no project 401'd exactly as described (route project.createProject) on a flow.google.com-migrated account before this change, and completed normally after setting GFLOW_CLI_DEFAULT_PROJECT_ID.
• Council review — not run; happy for a maintainer to run pr-council-review and I'll address findings (including, presumably, the CLI-parity gap noted above).

Validation

• Focused tests added for the behavior change (4 new tests, see above)
• Documentation: the new setting's own Field(description=...) is its documentation (matches this repo's existing pattern for GFLOW_CLI_* settings); no separate doc page touched
• uv run python scripts/ci/check_doc_links.py — not run (no docs touched)
• uv run ruff check src tests (scoped to the 4 changed files)
• uv run pyright src (scoped to config.py + mcp/tools.py)
• uv run pytest -q tests/test_config.py tests/mcp/test_tools_wired.py → 97 passed

Contribution Checklist

• This PR targets develop
• My commits use my real Git identity
• Commit includes Signed-off-by: (git commit -s)
• No secrets, cookies, account tokens, signed URLs, or private captured data included
• I reviewed the AI-assisted change before submitting

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features
  • Added support for configuring a default project for image and video generation.
  • Generation requests without an explicit project now use the configured default before creating a temporary project.
  • Added validation requiring default project identifiers to be 1–128 characters containing only letters, digits, and hyphens.
  • Documented project requirements and limitations for generation on migrated hosts.
  • CLI commands that omit a project continue using temporary-project behavior.

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📝 Walkthrough

Walkthrough

The change adds a validated default project setting. Image and video generation use this setting when no project is provided. Tests cover configuration validation and image-generation project resolution.

Changes

Default project selection

Layer / File(s)	Summary
Default project configuration and validation src/gflow_cli/config.py, tests/test_config.py	Settings.default_project_id accepts optional letters, digits, and hyphens within 1–128 characters. Tests cover defaults, valid values, and invalid values.
Generation project resolution src/gflow_cli/mcp/tools.py, tests/mcp/test_tools_wired.py	Image and video generation use the configured default project when project is omitted. Documentation describes fallback and migrated-host behavior. Wired tests update settings fixtures and verify image resolution without scratch-project creation.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant ImageGenerationTool
  participant Settings
  participant ScratchProjectCreation
  participant ImageGenerationTask
  ImageGenerationTool->>Settings: read default_project_id
  Settings-->>ImageGenerationTool: return configured project ID
  ImageGenerationTool->>ImageGenerationTask: submit generation with resolved project
  ImageGenerationTool-->>ScratchProjectCreation: do not create scratch project

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Merge Risk: ⚪ Minimal · up to 507e9

Image and video MCP generation retain explicit-project precedence and use the configured fallback when omitted, with the prior scratch behavior preserved when no fallback is configured. No merge-blocking risk is identified.

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Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a configurable MCP fallback project when project is omitted.
Docstring Coverage	✅ Passed	Docstring coverage is 87.50% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 16 functions across 4 files.
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Inline comments:
In `@src/gflow_cli/config.py`:
- Line 532: Update the default_project_id description in the configuration help
text to describe only MCP generation calls: clarify that it supplies a fallback
for omitted MCP project arguments, while CLI commands omitting --project retain
scratch-project behavior, and adjust the override wording to refer specifically
to MCP project arguments.

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[ffroliva]

Thank you @iceblue03 — this is a real bug and a clear, honest write-up (the scope note on CLI parity especially).

We're taking the work over and bundling it with the reports that share the same cause, tracked in #864. Two things change in the takeover:

• The fallback needs to reach the CLI as well as MCP, so both surfaces behave the same.
• The misleading "run gflow auth login" error should be fixed for everyone, including people who never set a default project.

The history for #561 also shows createProject returning 200 on a flow.google.com account on a later version, so we're measuring how consistently it fails before settling the design.

Your commits' idea will carry into the fix, and you'll be credited in the changelog. We'll close this PR in favour of that one once it's open, and ping you when the release ships.

[ffroliva]

Shipped in v0.78.0 — thank you for this one, it found a real and badly-reported bug.

Your premise checked out, and then some: project.createProject doesn't just 401 on these accounts, it is retired. It answers 404 "Flow RPCs have been deprecated and disabled. Flow has migrated to https://flow.google.com." for a session holding a labs token, and 401 for one without — 12/12 across four profiles. So the "re-authenticate" advice could never have helped, exactly as you said.

Because of that we fixed the cause rather than adding a fallback: gflow now creates the project on flow.google.com when the labs route refuses (keyed on that observed 401/404, never on which host the account is served), and reads the new id and title from Flow's reply. That fixes the CLI too, which your scope note honestly flagged as still broken — gflow image t2i with no --project, gflow project create and gflow project rename all work there now.

The configurable default project itself isn't in this release. With creation working it is no longer a workaround, and as a feature it belongs to the sticky-defaults workstream that already owns the design it needs (showing which file a value came from, and whether a project .env may set it at all). The idea is recorded there with credit to you.

Credited in the changelog (#868). Closing this PR in favour of that one.

[ffroliva]

Superseded by #868, shipped in v0.78.0. Your idea and the credit are in the changelog; the configurable default project is tracked with the sticky-defaults workstream.

[iceblue03]

Superseded by #868 — the root fix (making project creation work on flow.google.com) makes the fallback-project workaround here unnecessary. Thanks for taking it further. Closing.