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APIs / Developer Tools / Modrinth API
Modrinth API logo

Modrinth API

67
AI ReadinessAI-Aware (B+)67/100
See full scorecard
Agent-ready OpenAPI document · curated by JenticDeveloper ToolsPackage Registrybearer26 EndpointsREST

Know of an official OpenAPI document? Contribute it →

For Agents

Search, publish, and manage Minecraft mods on Modrinth: search projects, create and modify projects and versions, look up versions by file hash, manage user profiles, and read tag taxonomies.

Use for: Search Modrinth for shader packs that support Minecraft 1.20.4, Create a new project for a Forge mod called 'Tinker's Auto Smelt', Upload a new version of project 'tinkers-auto-smelt' targeting Minecraft 1.21, Find the project version that matches the file hash a3f9c8e2

Not supported: Does not handle in-game Minecraft state, server administration, or user payments - use for Modrinth project, version, and user metadata only.

Jentic publishes the only available OpenAPI specification for Modrinth API, keeping it validated and agent-ready. Modrinth is an open mod hosting platform for Minecraft mods, modpacks, resource packs, and shaders, served by the Labrinth backend. The API exposes 26 endpoints covering project search, project and version CRUD, multi-id batch fetches, version-by-file-hash lookups, user profile management, project team membership, tag taxonomies, and instance statistics. It is a strong fit for mod launchers, automated update checkers, and any tool building a Minecraft modding pipeline.

Jentic One on GithubView OpenAPI Document

Install Jentic One Beta

Connect the Modrinth API to your agent

Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Modrinth 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%2Fapi.modrinth.com%2Fmodrinth" | sh
2

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%2Fapi.modrinth.com%2Fmodrinth" | sh
jentic register       # connects your agent to your Jentic One instance

Jentic 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 Modrinth API.

Search Modrinth projects by query, facets, and filters with pagination

Create new projects and modify or delete existing projects on behalf of an authenticated user

List, create, modify, and delete versions for a project including dependency declarations

Look up the version that owns a specific file via SHA-1 or SHA-512 hash for update detection

Fetch multiple projects or versions in a single batched call by ID

Read user profiles, list a user's projects, and update profile details for the authenticated user

List taxonomy tags (categories, mod loaders, game versions, licenses, donation platforms) used to classify projects

Use Cases

Patterns agents use Modrinth API for, with concrete tasks.

★ Mod Launcher Update Checker

Build a Minecraft launcher that detects which installed mods have new versions on Modrinth by hashing each local jar and calling /version_file/{hash}. The launcher then offers users one-click updates. Most launchers ship a working hash-based updater in 2 to 3 days using the public read API.

Compute the SHA-512 of every jar in the user's mods folder, call /version_file/{hash} for each, and present any version where versionId is newer than the locally installed one.

Automated Mod Publishing

Wire Modrinth into a CI pipeline so that every tagged release on GitHub publishes a new version to Modrinth via POST /version. The job uploads the jar, sets dependency constraints, and updates the project description if the changelog has changed. Typical setup is a day to script the release.

After a successful GitHub release for project 'tinkers-auto-smelt', call POST /version with the jar attached, version_number from the release tag, and game_versions ['1.21'].

Modpack Curation Dashboard

A modpack curator can use /search and /projects to browse and batch-fetch project metadata, then surface a curated list to their community. The /tag endpoints supply the categories and loader filters that drive faceted UI. Most teams build the dashboard in a week.

Call /search with facets ['categories:adventure', 'project_type:modpack', 'versions:1.21'] and present the top 50 results sorted by downloads.

AI Modding Assistant

An AI assistant for Minecraft modders can answer 'find me a shader pack that works with Iris on 1.20.4' or 'publish the new version of my mod' through Jentic. Modrinth bearer tokens stay in your Jentic One instance and never enter agent context. Setup is under an hour.

Use Jentic to search for 'search Modrinth projects', execute /search with the user's natural-language query parsed into facets, and present the top 10 matches.

Key Endpoints

26 endpoints — jentic publishes the only available openapi specification for modrinth api, keeping it validated and agent-ready.

METHOD

PATH

DESCRIPTION

GET

/search

Search Modrinth projects

GET

/project/{idOrSlug}

Get a project by ID or slug

POST

/project

Create a new project

POST

/version

Create a new version of a project

GET

/version_file/{hash}

Get a version from a file hash

GET

/user

Get the authenticated user

GET

/tag/category

List all categories

GET

/search

Search Modrinth projects

GET

/project/{idOrSlug}

Get a project by ID or slug

POST

/project

Create a new project

POST

/version

Create a new version of a project

GET

/version_file/{hash}

Get a version from a file hash

GET

/user

Get the authenticated user

GET

/tag/category

List all categories

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.

M

Modrinth API

- AI-Aware (B+)
67/100
99
Foundational Compliance
63
Developer Experience & Jentic Compatibility
46
AI-Readiness & Agent Experience
94
Agent Usability
60
Security
100
AI Discoverability
Powered by JenticScoring Framework 1.0.0 | Scoring Engine 0.4.0
Show dimension breakdown
99

Foundational Compliance

Base layer of spec validity and structural soundness.

Grade: A+Signals: 4
97%

Lint Results

Aggregated quality score from linter diagnostics, weighted by severity.

100%

Resolution Completeness

Percentage of `$ref` references that resolve successfully.

100%

Specification Validity

Checks whether the API description parses successfully and conforms to its declared specification (e.g., OpenAPI).

100%

Structural Integrity

Structural correctness score based on schema issues using logarithmic dampening.

63

Developer Experience & Jentic Compatibility

Clarity, completeness, and ingestion readiness for developers and tooling.

Grade: B-Signals: 4
0%

Example Density

How richly the API is illustrated with examples.

100%

Example Validity

Percentage of examples that conform to their schemas.

50%

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.

46

AI-Readiness & Agent Experience

Semantic breadth, depth, and agent comprehension for AI systems.

Grade: DSignals: 4
28%

Description Coverage

Coverage of descriptions across API elements.

0%

Error Standardization

Coverage of RFC 9457 Problem Details for error responses.

100%

OperationId Quality

Coverage, uniqueness, and casing consistency of operationIds for AI inference.

55%

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.

60

Security

Trust, risk posture, and security compliance.

Grade: B-Signals: 1
60%

Authentication Strength

Average quality of security schemes based on authentication method strength (weakest link for OAuth2).

100

AI Discoverability

Findability, semantic richness, and reasoning readiness.

Grade: A+Signals: 1
100%

Descriptive Richness

Clarity and depth of descriptions across API elements.

View full reportHow the score is calculatedMore about the dimensions

Score it yourself

Every API in the directory is allowlisted, so you can re-score it with no key required.

Score your own APIScoring CLI agent skill
npx @jentic/api-scorecard-cli score <openapi-url>

Why Jentic?

What agents get from Jentic-routed access to this vendor.

Setup

Wiring the Modrinth API by hand means setting up its bearer token auth and coding your own calls to the search, project, and version endpoints. Through Jentic you install once, import the Modrinth API from the API Directory, store the token once, and your agent calls it.

Permission scoping

Modrinth puts the project id or slug and file hash in the URL path (/project/{idOrSlug}, /version_file/{hash}), and those lookups are read-only, so a rule can pin your agent to reading one project. You choose the operations it may call, so creating a project or version is not included unless you add it.

Credential isolation

Your Modrinth token is stored once, encrypted, by your own Jentic One instance and injected at execution time. It never enters the agent's prompt, logs, or context.

Intent-based discovery

Agents search Jentic by intent such as 'search for a mod' or 'get project metadata by slug', and Jentic returns the matching Modrinth operation with its input schema so the agent calls the right endpoint without browsing the reference docs.

Related APIs

Alternatives and complements available in the Jentic catalogue.

Alternative

CurseForge API

→

Mod hosting platform owned by Overwolf, dominant in Minecraft modding

Choose CurseForge when targeting users on the Overwolf launcher; pick Modrinth for an open-source-friendly community and free public API.

Complementary

Hypixel API

→

Player and game data from the Hypixel Minecraft server network

Use Hypixel alongside Modrinth when building tools that combine in-game player stats with mod content discovery.

Complementary

GitHub API

→

Source-control platform that hosts most Modrinth mod source code

Pair GitHub with Modrinth in CI pipelines that build a jar from a tagged GitHub release and publish it as a new Modrinth version.

FAQs

Specific to using Modrinth API through Jentic.

Why is there no official OpenAPI spec for Modrinth API?

Modrinth (Labrinth) does not publish an OpenAPI specification. Jentic generates and maintains this spec so that AI agents and developers can call Modrinth API via structured tooling. It is validated against the live API and kept up to date. Get started with Jentic One, the self-hosted execution layer.

What authentication does the Modrinth API use?

Modrinth uses HTTP token authentication under the tokenAuth bearer scheme. Generate a personal access token from your Modrinth profile and pass it as a bearer token. Through Jentic, the token is stored encrypted in your Jentic One instance and the agent receives only a scoped session at execution time.

Can I look up a Modrinth version by file hash?

Yes. GET /version_file/{hash} resolves a SHA-1 or SHA-512 hash to the version that owns the file. This is the standard way for mod launchers to detect installed mods and check for available updates.

What are the rate limits for the Modrinth API?

Modrinth applies a 300 requests per minute rate limit on its public API. Authenticated requests share that pool; if you exceed it, the API returns 429 with a Retry-After header. Cache aggressively when paginating large result sets.

How do I publish a new mod version with the Modrinth API through Jentic?

Run pip install jentic, then search for 'create a new mod version'. Jentic returns the POST /version operation schema. Execute it with the project_id, version_number, game_versions, loader, and primary file payload, then verify with GET /version/{id}.

Does the Modrinth API support project search with facets?

Yes. GET /search accepts the query parameter for free text plus facets for project_type, categories, versions, loaders, and license. This is the same engine that powers the modrinth.com search experience.

Can I limit what my agent is allowed to do with the Modrinth API?

Yes. Because you self-host Jentic One, your own rules decide which Modrinth operations and credentials the agent may use. You can pin it to read-only lookups like GET /project/{idOrSlug} and GET /version_file/{hash}, since Modrinth takes the project id, slug, or file hash in the URL path, so a rule can scope the agent to reading a single project. Write operations such as POST /project or POST /version are not available to the agent unless you explicitly add them.

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View OpenAPI Document