Google Identity Toolkit API
Browse all Google APIs41
AI ReadinessFoundational (D-)41/100
Official vendor OpenAPI document · agent-readyIdentity AuthAuthenticationoauth220 EndpointsREST
For Agents
Manage user accounts and federated sign-in for Firebase Authentication / legacy Identity Toolkit: create accounts, reset passwords, verify email, exchange credentials, and bulk import.
Use for: Create a new user with email and password, Send a password-reset email to a user, Verify a user's email address with an out-of-band code, Sign in a user with email and password and return an ID token
Not supported: Does not handle authorisation, IAM roles, or app-side session storage - use for Firebase Authentication / Identity Toolkit account creation, sign-in, and account migration only.
The Google Identity Toolkit API v3 is the relying-party endpoint set used by Firebase Authentication and the legacy Identity Toolkit product to manage user accounts and federated sign-in. It exposes operations for creating, retrieving, updating, and deleting accounts, sending email verification and password-reset codes, exchanging credentials for ID tokens, signing users up and in with email and password, and uploading or downloading bulk account data. Newer Firebase Auth deployments use the Identity Toolkit v2 surface; v3 remains the system of record for many existing apps and toolchains.
Install Jentic One Beta
Connect the Google Identity Toolkit API to your agent
Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Google Identity Toolkit API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.
Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.
1
Step 1: Jentic One Host machine
# On the machine that will host your Jentic One instance:
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fgoogleapis.com%2Fidentity-toolkit" | sh2
Step 2: Agent machine
# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fgoogleapis.com%2Fidentity-toolkit" | sh
jentic register # connects your agent to your Jentic One instanceJentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.
Capabilities
What an agent can do with Google Identity Toolkit API.
Create user accounts with email/password and assign initial profile fields
Issue email-verification, password-reset, and email-link sign-in confirmation codes
Sign users in via email and password and exchange for an ID token and refresh token
Look up account info by email or local ID and update profile or password
Bulk download and upload accounts to migrate users in or out of Firebase Authentication
Manage federated sign-in by creating sign-in URIs for IDPs and verifying the assertion
Use Cases
Patterns agents use Google Identity Toolkit API for, with concrete tasks.
★ Email-and-Password Sign-In for Web Apps
Web and mobile apps that use Firebase Authentication call the Identity Toolkit endpoints to sign users up and in with email and password, send verification emails, and reset forgotten passwords. /signupNewUser creates the account, /verifyPassword exchanges credentials for tokens, /getOobConfirmationCode generates the email link, and /resetPassword completes the reset flow. The API issues short-lived ID tokens that the app uses for authenticated API calls.
Call POST /signupNewUser with email user@example.com and password Tr0ub4d0r! and returnSecureToken true, and return the issued idToken and refreshToken.
Account Migration into Firebase
Teams migrating from a legacy auth system to Firebase Authentication use /uploadAccount to bulk-import accounts with their existing password hashes (scrypt, bcrypt, HMAC SHA variants), so users can sign in with their existing passwords on day one. /downloadAccount supports the reverse direction or backups. Both endpoints page through the user database in batches.
Bulk-import the supplied list of 100 users (email, hashed password, salt) via POST /uploadAccount with hashAlgorithm STANDARD_SCRYPT, and report how many were created versus skipped.
Email-Verification Workflow
Apps issue an email-verification link by calling /getOobConfirmationCode with VERIFY_EMAIL request type, then handle the user clicking the link by calling /setAccountInfo to flip emailVerified true. The API also supports the email-link sign-in flow via /emailLinkSignin for passwordless onboarding.
Send a verification email to user@example.com by calling /getOobConfirmationCode with requestType VERIFY_EMAIL and idToken set to the user's current token, and return the emailVerificationLink response.
AI Agent User Management Operations
An AI agent acting as a tier-2 support tool uses Jentic to look up users by email, force a password reset, or unlock an account on the Identity Toolkit API. Jentic isolates the Firebase admin credential so the agent never holds raw service-account JSON, and per-action policy limits which operations the agent can run.
Look up the user with email forgot@example.com via /getAccountInfo, then call /getOobConfirmationCode with requestType PASSWORD_RESET to send them a reset link, and return the oobLink.
Key Endpoints
20 endpoints — the google identity toolkit api v3 is the relying-party endpoint set used by firebase authentication and the legacy identity toolkit product to manage user accounts and federated sign-in.
METHOD
PATH
DESCRIPTION
POST
/signupNewUser
Create a new user account with email and password
POST
/verifyPassword
Sign in a user with email and password
POST
/getAccountInfo
Look up account info by email or localId
POST
/setAccountInfo
Update account fields including password and emailVerified
POST
/getOobConfirmationCode
Issue an out-of-band code for email verification, password reset, or email-link sign-in
POST
/resetPassword
Complete a password reset with an out-of-band code
POST
/deleteAccount
Delete a user account
POST
/downloadAccount
Bulk download accounts
POST
/signupNewUser
Create a new user account with email and password
POST
/verifyPassword
Sign in a user with email and password
POST
/getAccountInfo
Look up account info by email or localId
POST
/setAccountInfo
Update account fields including password and emailVerified
POST
/getOobConfirmationCode
Issue an out-of-band code for email verification, password reset, or email-link sign-in
POST
/resetPassword
Complete a password reset with an out-of-band code
POST
/deleteAccount
Delete a user account
POST
/downloadAccount
Bulk download accounts
Jentic AI Readiness Score
This API is usable in Jentic One now. Its AI-readiness score against Jentic's framework shows where it stands today and where improvements would make it even easier for agents to use.
G
Google Identity Toolkit API
- Foundational (D-)41/100
48
Foundational Compliance56
Developer Experience & Jentic Compatibility21
AI-Readiness & Agent Experience94
Agent Usability63
Security47
AI DiscoverabilityPowered by JenticScoring Framework 1.0.0 | Scoring Engine 0.4.0
Show dimension breakdown
48
Foundational Compliance
Base layer of spec validity and structural soundness.
Grade: D+Signals: 4
91%
Lint Results
Aggregated quality score from linter diagnostics, weighted by severity.
100%
Resolution Completeness
Percentage of `$ref` references that resolve successfully.
0%
Specification Validity
Checks whether the API description parses successfully and conforms to its declared specification (e.g., OpenAPI).
0%
Structural Integrity
Structural correctness score based on schema issues using logarithmic dampening.
56
Developer Experience & Jentic Compatibility
Clarity, completeness, and ingestion readiness for developers and tooling.
Grade: CSignals: 4
0%
Example Density
How richly the API is illustrated with examples.
100%
Example Validity
Percentage of examples that conform to their schemas.
25%
Response Coverage
Percentage of operations with complete response definitions (success, client error, server error).
100%
Tooling Readiness
Health of API ingestion, bundling, and resolution within Jentic pipelines.
21
AI-Readiness & Agent Experience
Semantic breadth, depth, and agent comprehension for AI systems.
Grade: FSignals: 4
82%
Description Coverage
Coverage of descriptions across API elements.
0%
Error Standardization
Coverage of RFC 9457 Problem Details for error responses.
0%
OperationId Quality
Coverage, uniqueness, and casing consistency of operationIds for AI inference.
0%
Summary Coverage
Coverage of summaries across operations/tags/info.
94
Agent Usability
Functional utility, complexity comfort, and AI orchestration readiness.
Grade: A+Signals: 1
94%
Complexity Comfort
Agent comfort level based on API operational and structural complexity.
63
Security
Trust, risk posture, and security compliance.
Grade: B-Signals: 1
62%
Authentication Strength
Average quality of security schemes based on authentication method strength (weakest link for OAuth2).
47
AI Discoverability
Findability, semantic richness, and reasoning readiness.
Grade: DSignals: 1
47%
Descriptive Richness
Clarity and depth of descriptions across API elements.
Score it yourself
Every API in the directory is allowlisted, so you can re-score it with no key required.
npx @jentic/api-scorecard-cli score <openapi-url>Why Jentic?
What agents get from Jentic-routed access to this vendor.
Setup
Wiring the Google Identity Toolkit API by hand means configuring Firebase admin OAuth2, refreshing tokens, and learning its unusual /relyingparty request shapes yourself. Through Jentic you install once, import the Google Identity Toolkit API from the API Directory, store the credential once, and your agent calls it.
Permission scoping
Identity Toolkit passes the account target in the request body rather than a resource in the URL path, so scope the agent to the operations it needs, such as signing up a user or sending a password-reset code. You choose the allowed set, so if you grant only getAccountInfo and getOobConfirmationCode the agent can look up and email users without ever deleting an account.
Credential isolation
Your Firebase Authentication admin credential is stored once, encrypted, by your own Jentic One instance and injected at execution time as a short-lived access token. The service-account JSON never enters the agent's prompt, logs, or context.
Intent-based discovery
Agents search Jentic by intent such as 'send password reset email' or 'sign up a firebase user', and Jentic returns the matching v3 operation with its input schema so the agent calls the right endpoint without browsing the /relyingparty docs.
Related APIs
Alternatives and complements available in the Jentic catalogue.
FAQs
Specific to using Google Identity Toolkit API through Jentic.
What authentication does the Identity Toolkit API use?
Google OAuth 2.0 with the cloud-platform / firebase scopes for admin endpoints, and the user's own ID token for self-service endpoints. Bulk import/export and account lookups require a service-account credential. Through Jentic the credentials live encrypted in the vault.
Can I bulk-import users with existing password hashes?
Yes. POST /uploadAccount accepts batches of users with hashAlgorithm set to STANDARD_SCRYPT, BCRYPT, HMAC_SHA1, HMAC_SHA256, or other supported variants, plus signerKey and saltSeparator where required. Users can sign in with their original passwords after import.
What are the rate limits for the Identity Toolkit API?
Google enforces per-project quotas on Firebase Authentication operations (default thousands of QPS for sign-in, lower for /uploadAccount and /downloadAccount). Email-sending endpoints (/getOobConfirmationCode) have separate sender quotas to prevent abuse.
How do I send a password-reset email through Jentic?
Search Jentic with 'send password reset email firebase', load the POST /getOobConfirmationCode operation, and execute with email set to the user's address and requestType PASSWORD_RESET. Jentic returns the oobLink and Firebase sends the email on the project's behalf.
Should I use Identity Toolkit v3 or the newer Firebase Auth v2 surface?
v3 (this API) is the long-standing relying-party surface still used by many SDKs; the newer Identity Toolkit v2 surface (identitytoolkit.googleapis.com/v2/) covers tenant-aware Firebase Auth with Identity Platform features (MFA, SAML/OIDC). Pick v3 for legacy and v2 for new tenant-aware deployments.
Can I limit what my agent is allowed to do with the Google Identity Toolkit API?
Yes. Because you run Jentic One yourself, your own rules decide which Identity Toolkit operations and which Firebase admin credential the agent may use. Since this API passes the account target in the request body rather than the URL path, you scope the agent to just the operations it needs: grant only getAccountInfo and getOobConfirmationCode and it can look up users and send password-reset or verification emails without ever calling deleteAccount, setAccountInfo, or uploadAccount. You choose the allowed set, and any operation you have not permitted is simply unavailable to the agent.
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