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With Antigravity set to Agent Platform (Vertex AI), a GCP project and location, and no API key, the runtime needs Google Cloud application default credentials (ADC). It does not check for them until the first prompt. T3 reported the provider as authenticated, sign-in said "Signed in.", and the first message failed with failed to find default credentials. Settings never mentioned ADC. Fixes#23036.
Change
The Antigravity provider check, sign-in, model refresh and sessions now look for ADC where the runtime's Google client looks, in its order:
CLOUDSDK_CONFIG/application_default_credentials.json when that variable is set, else ~/.config/gcloud/... (%APPDATA%\gcloud\... on Windows), read from the instance's environment;
GCE_METADATA_HOST;
the metadata server: one direct GET to 169.254.169.254, accepted only with a Metadata-Flavor: Google reply; it runs only when no file is found, at most once per provider instance, and gives up after one second.
GOOGLE_APPLICATION_CREDENTIALS is not checked because T3 already strips it from the runtime's environment. With none of these present, the provider shows Unavailable with: "Agent Platform without an API key needs Google Cloud application default credentials. Run gcloud auth application-default login, or enter an API key in the Antigravity provider settings." Sign-in, model refresh and sessions fail with the same text before the runtime is spawned.
Sign out skips the ADC check, so removing the credentials does not block it. The file check runs on every probe and start, so credentials created later are picked up on the next status refresh. An API key, or the other sign-in methods, skips it. The mock ACP agent now accepts the agent-platform login and the runtime's raw logout request.
Scope and approval
Bug issue #23036, no maintainer comment yet. This takes the issue's minimum ask: report the missing credentials before a thread starts. It does not add a credential-free Agent Platform sign-in. Maintainers should confirm two choices; both await maintainer review:
With no credentials file, the server probes the metadata server once per provider instance and keeps the result until the instance restarts, so a host that gains or loses metadata access needs a restart or a settings change. The probe skips any outbound proxy (--use-env-proxy, NODE_USE_ENV_PROXY), which cannot reach a link-local address. Other requests keep the proxy.
A provider snapshot cached as authenticated by an earlier sign-in keeps Account at "Signed in." while the provider row shows Unavailable. I saw this on web after signing in on base and restarting on this branch. This PR leaves cached auth state alone.
Verification
Real app, dev web and Linux desktop builds and Debug mobile builds against a T3 server whose Antigravity runtime is the repo's mock ACP agent, Agent Platform with project and location and no ADC: web and Linux desktop Settings, iOS 26.5 simulator and Android 16 emulator Provider accounts. Base and branch captures below.
vp test run src/provider/Drivers/AntigravityDriver.test.ts with the new test on main's source fails: expected 'refresh succeeded' to contain 'gcloud auth application-default login'. On this branch refresh fails with the message, nothing spawns, and after ~/.config/gcloud/application_default_credentials.json is written the next refresh is authenticated. It passes with GCE_METADATA_HOST and CLOUDSDK_CONFIG set in the calling shell.
Two more driver tests: with no local file, a metadata server reply starts the runtime and is probed once across two refreshes; after sign-in, removing the file still lets Sign out finish and the provider becomes unauthenticated.
Unit tests for the lookup (CLOUDSDK_CONFIG, GCE_METADATA_HOST, %APPDATA% on Windows with no POSIX fallback, metadata server credentials on Linux and Windows) and the probe (Google reply, other reply, transport error, no reply after one second, direct reply under an env proxy).
Focused Antigravity and mock-agent suites (17 files, 325 tests, 1 skipped by its Node version guard), format, lint and typecheck pass.
Not checked:
The real Antigravity runtime and a real Vertex AI call. The lookup order follows cloud.google.com/go/auth, whose error text the issue quotes; I did not trace it inside the runtime binary.
A real GCE VM, Cloud Run or Workstations metadata server, with or without a real proxy, and Windows.
macOS and Windows desktop builds. The Linux desktop capture runs the same Settings page as web.
Full CI suites; format, lint and typecheck ran on the server package only.
Prior PRs
No earlier PR checks for Agent Platform credentials. Related issues for the same pattern on other sign-in methods: #16078 and #12751.
Web Settings on base: Sign in reports "Authenticated · Agent Platform" and "Signed in." with no ADC on the machine.
Linux desktop Settings on base: Sign in reports "Authenticated · Agent Platform" and "Signed in." with no ADC.
Web Settings on this branch: Antigravity is Unavailable and says how to create the credentials.
Linux desktop Settings on this branch: Antigravity is Unavailable with the same message.
Web Settings on this branch after application_default_credentials.json is created and the status is refreshed: the error clears.
Linux desktop Settings on this branch after the file is created and the status is refreshed: Antigravity reports "Authenticated · Agent Platform".
Linux desktop Settings on this branch: signed in with ADC, then the file is removed and Sign out still completes.
iOS Provider accounts on base: Sign in ends at "Signed in." with no ADC.
iOS Provider accounts on this branch: Sign in fails with the credentials message.
Android Provider accounts on base: Sign in ends at "Signed in." with no ADC.
Android Provider accounts on this branch: Sign in fails with the credentials message.
The missing-credentials driver test fails on main's source.
The new driver and credential tests pass on this branch.
…tials are missing
Agent Platform without an API key relies on Google Cloud application
default credentials, but the Antigravity runtime starts sessions without
them, so T3 reported the provider as authenticated and the first prompt
failed with a raw credential error. The provider check and every runtime
start now look for the credentials the runtime would find and report how
to create them instead.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The runtime's Google credential lookup reads application default
credentials from CLOUDSDK_CONFIG when it is set, as gcloud writes them
there. Without it, the new check blocked Agent Platform for users whose
gcloud config lives outside ~/.config/gcloud.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…till signs out
Probe the Google metadata server, once per instance and bounded to one
second, before reporting missing application default credentials, as the
runtime's Go client does. This replaces the Linux DMI guess, which
rejected valid credentials on Windows VMs and on hosts with an unknown
product name.
Sign-out no longer checks for Google Cloud credentials, so removing them
after sign-in does not block it. Driver tests pin CLOUDSDK_CONFIG and
GCE_METADATA_HOST so the caller's shell cannot change their result.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
With --use-env-proxy or NODE_USE_ENV_PROXY, the metadata server probe
went through the global proxy dispatcher. A proxy cannot reach the
host's link-local metadata address, so valid metadata credentials were
reported as missing. The probe now uses undici's fetch on its own Agent,
like the Go client's proxy-free transport; other outbound calls keep
the proxy.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Macroscope's review found this PR requires human approval — This PR changes production Antigravity authentication and credential-discovery behavior, including filesystem and metadata-server checks and a sign-out path that bypasses credential validation. It also adds a static-analysis suppression directive in tests, so the changes require human review.
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Walkthrough
Antigravity Agent Platform authentication now checks for local application-default credentials or access to a Google Cloud metadata server. Runtime validation and health probes use this check. Sign-out skips credential validation, and the mock agent accepts Agent Platform authentication and raw logout requests.
Credential validation and metadata probing apps/server/src/outboundHttp.ts, apps/server/src/provider/antigravityAuthSupport.ts, apps/server/src/provider/antigravityAuthSupport.test.ts
Authentication support checks platform-specific application-default credential locations. The metadata probe uses a dedicated direct fetch, checks the Metadata-Flavor response header, and returns false on errors or timeout. Tests cover credential locations, probe outcomes, timeout, and proxy bypass.
The driver applies the authentication check during runtime creation and health probes. Tests cover missing and available credentials, metadata-server detection, and cached metadata probing.
Sign-out runtime creation skips credential validation. The mock agent accepts Agent Platform authentication and handles raw logout requests. A driver test checks logout after local credentials are removed.
pingdotgg/t3code#23036: This PR adds ADC detection and status guidance for the missing-credentials case described in the issue. It does not add credential-free sign-in.
Possibly related PRs
pingdotgg/t3code#27759: Both PRs change Agent Platform credential setup behavior; this PR detects missing ADC while the other changes credential-specific Connect wording.
pingdotgg/t3code#24939: Both PRs change Antigravity behavior when authentication is required during session startup.
Suggested labels:bugfix
Suggested reviewers:maria-rcks, juliusmarminge
Merge Risk: Minimal · previous review a76b2
No actionable merge-blocking issue was established; the change is ready for normal merge checks.
Pre-merge checks: 4
Check name
Status
Explanation
Title check
The title "fix(server): Antigravity reports missing Agent Platform credentials" matches the main change. The changeset adds a check for Google Cloud application default credentials (ADC) for Agent Pla…
Description check
The description follows the repository template. It has Problem, Change, Scope and approval, and Verification sections. The Problem section gives the expected behavior and reproduction context. The Ch…
Linked Issues check
Issue #23036 requires an early ADC warning when Agent Platform has no API key, even if the credential-free sign-in path is not implemented. AntigravityDriver.ts evaluates antigravityAuthIssue duri…
Out of Scope Changes check
The changed files remain connected to issue #23036. antigravityAuthSupport.ts implements ADC detection and the direct metadata probe. outboundHttp.ts supports proxy-free metadata access. `Antigrav…
Full details: Title check
Explanation
The title "fix(server): Antigravity reports missing Agent Platform credentials" matches the main change. The changeset adds a check for Google Cloud application default credentials (ADC) for Agent Platform, so the provider reports missing credentials before a session starts. The title is a conventional commit, specific, and does not use vague terms.
Full details: Description check
Explanation
The description follows the repository template. It has Problem, Change, Scope and approval, and Verification sections. The Problem section gives the expected behavior and reproduction context. The Change section explains the ADC lookup order and the behavior when credentials are absent. The Scope section links issue #23036, names the open maintainer decisions, and states what was not verified. The Verification section lists focused tests, manual checks on web, Linux desktop, iOS, and Android, and includes a Not checked list. The author also lists the model and harness at the end, which the template asks for. The description also includes a Prior PRs section and screenshots, which are beyond the template but do not conflict with it.
Full details: Linked Issues check
Explanation
Issue #23036 requires an early ADC warning when Agent Platform has no API key, even if the credential-free sign-in path is not implemented. AntigravityDriver.ts evaluates antigravityAuthIssue during provider probing and runtime creation, before the runtime starts. antigravityAuthSupport.ts checks the platform gcloud ADC file and then performs a bounded metadata-server probe that accepts only Metadata-Flavor: Google. The provider returns the issue's required guidance before a thread starts. Sign-out uses the configuration-only check, so missing ADC does not block sign-out. Tests cover missing credentials, file recovery, metadata credentials, and sign-out.
Full details: Out of Scope Changes check
Explanation
The changed files remain connected to issue #23036. antigravityAuthSupport.ts implements ADC detection and the direct metadata probe. outboundHttp.ts supports proxy-free metadata access. AntigravityDriver.ts applies the check to status and runtime creation. AntigravityAuth.ts and the mock ACP agent support sign-out and the test flow. The added tests verify these paths. No unrelated product behavior or credential-free sign-in flow was added.
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Inline comments:
Review comments at @apps/server/src/provider/antigravityAuthSupport.ts:
- Around line 141-177: Update antigravityAuthIssue so a truthy GCE_METADATA_HOST
does not bypass metadata reachability checks. Ensure the host.onGoogleCloud
probe uses the configured metadata endpoint when present, falling back to the
standard endpoint otherwise, and accept cloud credentials only after that probe
succeeds.
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thanks @only21mil. your preflight and sign-out bypass preserve the useful part of this fix: missing adc is reported before starting a thread, and users can still sign out after removing credentials.
i kept your commits, merged current main, and added two scoped fixes:
probe GCE_METADATA_HOST instead of treating its presence as proof of credentials. the configured host must return Google's metadata header. consolidated the two probe exports.
removed the CLOUDSDK_CONFIG override. the official bundled 1.3.0 runtime ignores it for adc lookup. real runtime probes confirmed it reads standard-home adc and ignores sdk-only adc.
verification on 147aba9d31379eb9ce45c9ea943b584683d02227:
all 28 ci checks green. two independent reviews are merge-ready, with no remaining findings. the metadata-host bot finding is fixed and resolved.
blacksmith vp run check:changed passed format, lint, knip, graphql, affected typechecks, and 56 tests; one existing node-version guard skipped. both regressions failed first in the existing test file. the focused driver/auth/support pass also passed all 53 tests.
official runtime, isolated home, no adc: authenticate and session/new succeed; the first prompt reports missing default credentials. reproduced the misleading signed-in state on main in the real web client. on this head, sign-in reports how to obtain adc. sign-out through the same client and real runtime succeeds without adc.
coderabbit's automatic follow-up hit its review limit; the resolved metadata-host finding is its only actionable finding. the two independent final-head reviews above completed.
unverified: a successful authenticated vertex ai request, live gce metadata, windows, and native desktop/mobile clients. @only21mil, the runtime still validates credentials only on the first prompt. this preflight detects missing credentials, not expired or malformed ones. metadata discovery stays cached per provider instance. an account previously cached as signed in can keep that label until sign-out; the provider status and failed sign-in show the credential error.
before, current main with the real runtime and no adc:
after, same provider settings and no adc:
uploaded images inspected; uploaded video playback and seeking checked in chrome. production credential discovery still needs maria's human review.
verified as-is on 147aba9d31379eb9ce45c9ea943b584683d02227 on this linux boat vm. no source changes or pushes.
ran vp i and the real dev server on github/main (2a738273e7) in /home/user/main, then stopped it before running the exact pr head with isolated .t3 state. drove both web clients with the repo's playwright and /usr/bin/google-chrome.
created a project pointing at the real /home/user/main git repo through the app. installed official antigravity 1.3.0 through settings. selected agent platform, project t3-pr24957-verification, location us-central1, no api key and no adc. used no mocks, fixtures, or demo turns.
main: sign-in reported "authenticated · agent platform" and "signed in.". a real gemini 3.8 flash prompt then failed with "failed to find default credentials".
pr: provider status explained missing adc before sign-in. sign-in and retry returned the same actionable guidance through the client's provider.auth.start stream. starting a thread through the running server's t3 cli also failed at session setup with the adc guidance in the server cause.
neighboring behavior: provider.auth.logout through an authenticated web websocket returned success and "signed out of google." using the real antigravity runtime with adc still absent. a codex gpt-6.1-sol turn submitted through the web composer completed with the requested response.
blacksmith: the existing AntigravityDriver.test.ts and antigravityAuthSupport.test.ts suites passed, 36 tests total. all 28 reported ci checks on this head are successful. this is runtime verification, not a merge-readiness verdict against today's main.
short runtime transcript, ids shortened:
main, web composer -> real antigravity:
Agent execution error: failed to create Gemini client:
failed to configure default GCP credentials for Vertex AI:
failed to find default credentials
pr:
$ timeout 60 node apps/server/src/bin.ts thread start \
--base-dir /home/user/t3code/.t3 --provider antigravity \
--model gemini-3.8-flash-low --wait /home/user/main \
'Reply with exactly: antigravity verification. Do not edit files.'
Thread mcp:25a5c212-...
Thread ... stopped with status failed: Failed to open antigravity provider session ...
server cause: ProviderSetupError: Agent Platform without an API key needs
Google Cloud application default credentials. Run `gcloud auth application-default login`,
or enter an API key in the Antigravity provider settings.
web websocket -> provider.auth.logout {instanceId:"antigravity"}:
Exit / Success / phase:"idle" / message:"Signed out of Google."
pr, web composer -> codex gpt-6.1-sol:
user: Reply with exactly: codex neighboring provider works. Do not edit files or run commands.
reply: codex neighboring provider works.
matching antigravity configuration on main and the pr. settings navigation differs because main has newer unrelated ui changes. the after capture follows sign-out, so its status reads "not authenticated" with the adc guidance.
captures inspected; uploaded video playback and seeking checked in t3's browser player. gitcafe renders external media as links. github renders the screenshots, but treats the external mp4 as an image, so inline video playback there is unavailable.
Not verified
successful vertex ai inference, recovery with real adc, api-key/google-account sign-in, and live google cloud metadata credentials require credentials or infrastructure absent here. desktop, native ios/android, macos, windows, relay and tunnel clients were not exercised. sign-out was exercised through the public websocket rpc; the signed-in account button after removing previously valid adc was not exercised. the focused tests cover that removal case.
merged current github/main into the contributor branch without rebasing or force-pushing. head: e513ff0bfc6c782f7bfbff2a8a043b319f2b32de. the merge brought in main's fix for the failing Astro check:changed test. no additional source edits; the PR remains seven files, +413/-13 against merged main.
kept the existing takeover fixes: configured metadata-host probing, the bundled runtime's ADC directory, credential-independent sign-out, and the 30-second metadata cache that recovers after transient failures. the metadata-host bot thread remains resolved; no new actionable findings.
verification on this head:
all 29 git.cafe check contexts successful, none pending or failing. GitHub reports MERGEABLE; git.cafe reports no conflicts.
blacksmith vp run check:changed github/main passed format, lint, both knip passes, graphql, affected typechecks, and 57 tests. one existing outbound-http test skipped under its node-version guard. the focused driver/auth-support/script pass passed all 51 tests, including the previously failing Astro test.
two independent gpt-6.1-sol source reviews approved this exact head with no blocking findings.
real web client, Playwright with /usr/bin/google-chrome, isolated task state: Agent Platform with project/location and no API key or ADC reports missing credentials. Connect returns the same guidance and offers Retry connection. no mock provider used.
capture inspected at full size; uploaded image opens in Chrome at 1440 by 1000. earlier before/after and interaction evidence remains in the prior verification comments.
unverified this pass: successful ADC/Vertex inference, live metadata recovery, real-runtime logout, native clients, Windows/macOS, relay and tunnel. Macroscope's production-auth human-review notice remains for Maria. no merge performed.
@maria-rcks this branch conflicts with main again. I have a fast-forward of your head e513ff0bfc on only21mil/t3code branch fix/i23036-antigravity-agent-platform-shows-authent-offer, at 3ec4fc7eaf:
3ec4fc7eaf fixes the typecheck failure main's refactor: Effect.try calls map failures to typed errors #31217 brings in. effectTryWithoutCatch rejected Effect.try(makeDirectFetch) in probeGoogleMetadataServer, so it now maps setup failures to a typed GoogleMetadataFetchError. The probe still returns false on any failure.
Verification at 3ec4fc7eaf:
vp run check:changed passes: format, lint, both knip checks, GraphQL, typecheck of 3 packages, and the changed tests.
The Antigravity and ACP suites pass, 286 tests across 12 files. The 2 skips are the existing Node-version guards in outboundHttp.test.ts.
With main's server sources, "reports missing Google Cloud credentials before Agent Platform starts" and "starts Agent Platform with metadata server credentials and no local credentials file" still fail: expected 'refresh succeeded' to contain 'gcloud auth application-default login'. They pass on 3ec4fc7eaf.
A gpt-6.1-sol review found nothing to fix.
The missing-credentials message is unchanged, and so is every client file in the PR. The existing captures still show what this head does.
Not checked, or not cleared:
A real Vertex AI call, live metadata, Windows, and native clients, as noted on 10-28.
Corrections to the PR body: CLOUDSDK_CONFIG is no longer read, the metadata check probes GCE_METADATA_HOST when it is set, and the probe result is cached for 30 seconds instead of once per instance. These follow your 729027d, 147aba9 and a76b2a7.
I can push this to the PR branch if you want it there.
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Problem
With Antigravity set to Agent Platform (Vertex AI), a GCP project and location, and no API key, the runtime needs Google Cloud application default credentials (ADC). It does not check for them until the first prompt. T3 reported the provider as authenticated, sign-in said "Signed in.", and the first message failed with
failed to find default credentials. Settings never mentioned ADC. Fixes #23036.Change
The Antigravity provider check, sign-in, model refresh and sessions now look for ADC where the runtime's Google client looks, in its order:
CLOUDSDK_CONFIG/application_default_credentials.jsonwhen that variable is set, else~/.config/gcloud/...(%APPDATA%\gcloud\...on Windows), read from the instance's environment;GCE_METADATA_HOST;169.254.169.254, accepted only with aMetadata-Flavor: Googlereply; it runs only when no file is found, at most once per provider instance, and gives up after one second.GOOGLE_APPLICATION_CREDENTIALSis not checked because T3 already strips it from the runtime's environment. With none of these present, the provider shows Unavailable with: "Agent Platform without an API key needs Google Cloud application default credentials. Rungcloud auth application-default login, or enter an API key in the Antigravity provider settings." Sign-in, model refresh and sessions fail with the same text before the runtime is spawned.Sign out skips the ADC check, so removing the credentials does not block it. The file check runs on every probe and start, so credentials created later are picked up on the next status refresh. An API key, or the other sign-in methods, skips it. The mock ACP agent now accepts the
agent-platformlogin and the runtime's rawlogoutrequest.Scope and approval
Bug issue #23036, no maintainer comment yet. This takes the issue's minimum ask: report the missing credentials before a thread starts. It does not add a credential-free Agent Platform sign-in. Maintainers should confirm two choices; both await maintainer review:
--use-env-proxy,NODE_USE_ENV_PROXY), which cannot reach a link-local address. Other requests keep the proxy.Verification
vp test run src/provider/Drivers/AntigravityDriver.test.tswith the new test on main's source fails:expected 'refresh succeeded' to contain 'gcloud auth application-default login'. On this branch refresh fails with the message, nothing spawns, and after~/.config/gcloud/application_default_credentials.jsonis written the next refresh is authenticated. It passes withGCE_METADATA_HOSTandCLOUDSDK_CONFIGset in the calling shell.CLOUDSDK_CONFIG,GCE_METADATA_HOST,%APPDATA%on Windows with no POSIX fallback, metadata server credentials on Linux and Windows) and the probe (Google reply, other reply, transport error, no reply after one second, direct reply under an env proxy).Not checked:
cloud.google.com/go/auth, whose error text the issue quotes; I did not trace it inside the runtime binary.Prior PRs
No earlier PR checks for Agent Platform credentials. Related issues for the same pattern on other sign-in methods: #16078 and #12751.
Web Settings on base: Sign in reports "Authenticated · Agent Platform" and "Signed in." with no ADC on the machine.
Linux desktop Settings on base: Sign in reports "Authenticated · Agent Platform" and "Signed in." with no ADC.
Web Settings on this branch: Antigravity is Unavailable and says how to create the credentials.
Linux desktop Settings on this branch: Antigravity is Unavailable with the same message.
Web Settings on this branch after
application_default_credentials.jsonis created and the status is refreshed: the error clears.Linux desktop Settings on this branch after the file is created and the status is refreshed: Antigravity reports "Authenticated · Agent Platform".
Linux desktop Settings on this branch: signed in with ADC, then the file is removed and Sign out still completes.
iOS Provider accounts on base: Sign in ends at "Signed in." with no ADC.
iOS Provider accounts on this branch: Sign in fails with the credentials message.
Android Provider accounts on base: Sign in ends at "Signed in." with no ADC.
Android Provider accounts on this branch: Sign in fails with the credentials message.
The missing-credentials driver test fails on main's source.
The new driver and credential tests pass on this branch.
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