FanZero — indie game distribution

Update game

update_game

Destructive

Change the listing or offers; remove_preview retires a demo, keeping the original links and pact windows. Agent uploads need preview_review. Automated checks read the code without playing it. Original game links remain the default. remove_preview:true retires an optional demo, keeping the listing status, pact windows and metadata; provide any missing media/platform/model fields in that same call. It cannot be combined with html/files. Archived files and review remain for audit. New agent html/files need preview_review with all flags true and a reason; never rebuild or strip the game merely to list it. Metadata-only edits without removal go back to curator review. Passing pacts replaces open offers; accepted agreements retain terms.

Input Schema

Name	Required	Description
`html`	No	Original game links are the default. Add optional self-contained html only with preview_review declaring representative, sandbox-tested and preferable to direct access; max 8 MB
`tags`	No
`agent`	No	Which agent is calling, e.g. "claude-code" or "codex"
`files`	No	Optional justified playable preview instead of html; needs index.html and preview_review. Do not adapt an online game just to host a preview
`genre`	No
`media`	No	Screenshots, gameplay and trailers. At least one when no optional playable version is supplied
`pacts`	No
`stage`	No	Optional. Omitted means not specified on a metadata-only listing; legacy playable submissions default to prototype
`title`	No
`api_key`	No	Studio API key. Only needed when the connection does not send Authorization: Bearer <key> (for example in the session that created the studio): then pass it on every call.
`game_id`	Yes	Game id (gm_…) or slug
`tagline`	No	One line that bites (8-120 chars)
`controls`	No	One line, e.g. "Arrows or drag"
`dev_note`	No	A personal note from the dev to influencers
`resubmit`	No	For a metadata-only listing: rerun review with its current metadata
`platforms`	No	Where to access/buy the actual game, each with its own price/model. At least one without a build
`store_url`	No	Optional https link to where the game already sells (Steam, itch.io, your site). Revenue from every store counts in a pact window. Pass "" or null to remove it.
`description`	No	What the game is, its audience and what influencers can show (60-4000 chars)
`monetization`	No	Explain how the game earns revenue across platforms; do not guess an unknown price
`preview_review`	No	Required for new html/files sent by an agent; all three flags must be true with an explicit reason. A declaration, not certification by static checks
`remove_preview`	No	Retire the playable preview, preserving the valid listing/status and pact windows. No html/files in the same call

Output Schema

Name	Required	Description
`url`	Yes	Public page, once listed
`slug`	Yes
`genre`	Yes
`media`	Yes
`notes`	Yes
`pacts`	Yes	Open pacts influencers can request
`stage`	Yes
`title`	Yes
`critic`	Yes
`status`	Yes
`game_id`	Yes
`version`	Yes
`blocking`	Yes
`warnings`	Yes
`next_step`	Yes	What to do now
`platforms`	Yes
`store_url`	Yes
`updated_at`	Yes	ISO-8601 time, UTC
`preview_url`	Yes	Optional playable version; null for a listing without a build
`curator_note`	Yes
`has_playable`	Yes
`monetization`	Yes
`pact_changes`	Yes	Set when pacts were sent
`preview_review`	Yes	Current preview declaration, if supplied. The stored build association is private; static checks do not certify the declarations

Schema Changelog

Changes observed during successful MCP inspections.

Changed21 schema fields changedOct 26, 2026

changedInput schema / properties / description / description

Previous value: -"What the game is, its audience and what creators can show (60-4000 chars)"New value: +"What the game is, its audience and what influencers can show (60-4000 chars)"

changedInput schema / properties / dev_note / description

Previous value: -"A personal note from the dev to streamers"New value: +"A personal note from the dev to influencers"

changedInput schema / properties / pacts / items / properties / action / description

Previous value: -"What the streamer (or YouTuber, TikToker) does: livestream, video, short, post or playtest"New value: +"What the influencer (a streamer, YouTuber or TikToker) does: livestream, video, short, post or playtest"

changedInput schema / properties / pacts / items / properties / share_pct / description

Previous value: -"Percent of the game's net revenue from every store, for 4 weeks from the earliest date in the creator's approved action plan. In percent: 10 means 10%. Above 0, at most 50. The window length is fixed."New value: +"Percent of the game's net revenue from every store, for 4 weeks from the earliest date in the influencer's approved action plan. In percent: 10 means 10%. Above 0, at most 50. The window length is fixed."

addedInput schema / properties / platforms / items / properties / type

Added value: +{
+  "description": "What kind of platform it is. Leave it out to have it read from the name and URL (unknown: other)",
+  "enum": [
+    "store",
+    "web_portal",
+    "app_store",
+    "console",
+    "own_site",
+    "ad_network",
+    "other"
+  ],
+  "type": "string"
+}

changedInput schema / properties / preview_review / properties / preferable_to_direct_link / description

Previous value: -"Must be true only if creators benefit more than by opening the original game link"New value: +"Must be true only if influencers benefit more than by opening the original game link"

changedOutput schema / properties / pacts / description

Previous value: -"Open pacts creators can request"New value: +"Open pacts influencers can request"

removedOutput schema / properties / platforms / items / properties / currency / description

Removed value: -"Uppercase currency code, e.g. EUR or USD; required for a positive price"

removedOutput schema / properties / platforms / items / properties / currency / pattern
```
Removed value: -"^[A-Z]{3}$"
```

addedOutput schema / properties / platforms / items / properties / evidence

Added value: +{
+  "description": "The platform's own report the studio settles with",
+  "type": "string"
+}

removedOutput schema / properties / platforms / items / properties / name / maxLength
```
Removed value: -60
```
removedOutput schema / properties / platforms / items / properties / name / minLength
```
Removed value: -1
```

removedOutput schema / properties / platforms / items / properties / note / description

Removed value: -"Price conditions, subscription period or optional purchase details"

removedOutput schema / properties / platforms / items / properties / note / maxLength
```
Removed value: -400
```

removedOutput schema / properties / platforms / items / properties / price / description

Removed value: -"This platform's purchase price. Omit an unknown price; zero means explicitly zero, never an assumed free game"

removedOutput schema / properties / platforms / items / properties / price / minimum
```
Removed value: -0
```

addedOutput schema / properties / platforms / items / properties / revenue

Added value: +{
+  "description": "declared: after a pact window the studio reports this platform's net revenue; nothing is connected",
+  "enum": [
+    "declared"
+  ],
+  "type": "string"
+}

addedOutput schema / properties / platforms / items / properties / type

Added value: +{
+  "description": "The studio's, or read from the name and URL",
+  "enum": [
+    "store",
+    "web_portal",
+    "app_store",
+    "console",
+    "own_site",
+    "ad_network",
+    "other"
+  ],
+  "type": "string"
+}

removedOutput schema / properties / platforms / items / properties / url / description
```
Removed value: -"Public HTTPS game/store URL"
```
removedOutput schema / properties / platforms / items / properties / url / maxLength
```
Removed value: -1000
```

changedOutput schema / properties / platforms / items / required

Previous value: -[
-  "name",
-  "url"
-]New value: +[
+  "name",
+  "url",
+  "type",
+  "revenue",
+  "evidence"
+]

Changed6 schema fields changedOct 13, 2026

changedInput schema / properties / files / description

Previous value: -"Optional multi-file playable version instead of html; must include index.html at the root"New value: +"Optional justified playable preview instead of html; needs index.html and preview_review. Do not adapt an online game just to host a preview"

changedInput schema / properties / html / description

Previous value: -"Optional playable version hosted on FanZero, self-contained index.html, max 8 MB. Omit for an online game; list its existing platforms instead"New value: +"Original game links are the default. Add optional self-contained html only with preview_review declaring representative, sandbox-tested and preferable to direct access; max 8 MB"

addedInput schema / properties / preview_review

Added value: +{
+  "additionalProperties": false,
+  "description": "Required for new html/files sent by an agent; all three flags must be true with an explicit reason. A declaration, not certification by static checks",
+  "properties": {
+    "preferable_to_direct_link": {
+      "description": "Must be true only if creators benefit more than by opening the original game link",
+      "type": "boolean"
+    },
+    "reason": {
+      "description": "Explain that choice in 20–600 characters. It must be within the owner's authorized scope",
+      "maxLength": 600,
+      "type": "string"
+    },
+    "representative": {
+      "description": "Must be true: this is representative of the actual game; it does not lose online/community, account, shop or ranking features",
+      "type": "boolean"
+    },
+    "sandbox_tested": {
+      "description": "Must be true only after playing this exact build successfully in the allow-scripts sandbox",
+      "type": "boolean"
+    }
+  },
+  "type": "object"
+}

addedInput schema / properties / remove_preview

Added value: +{
+  "description": "Retire the playable preview, preserving the valid listing/status and pact windows. No html/files in the same call",
+  "type": "boolean"
+}

addedOutput schema / properties / preview_review

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": false,
+      "properties": {
+        "preferable_to_direct_link": {
+          "type": "boolean"
+        },
+        "reason": {
+          "type": "string"
+        },
+        "representative": {
+          "type": "boolean"
+        },
+        "sandbox_tested": {
+          "type": "boolean"
+        }
+      },
+      "required": [
+        "representative",
+        "sandbox_tested",
+        "preferable_to_direct_link",
+        "reason"
+      ],
+      "type": "object"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "description": "Current preview declaration, if supplied. The stored build association is private; static checks do not certify the declarations"
+}

changedOutput schema / required

Previous value: -[
-  "game_id",
-  "slug",
-  "title",
-  "version",
-  "status",
-  "next_step",
-  "genre",
-  "stage",
-  "store_url",
-  "url",
-  "preview_url",
-  "has_playable",
-  "media",
-  "platforms",
-  "monetization",
-  "blocking",
-  "notes",
-  "critic",
-  "curator_note",
-  "pacts",
-  "warnings",
-  "updated_at",
-  "pact_changes"
-]New value: +[
+  "game_id",
+  "slug",
+  "title",
+  "version",
+  "status",
+  "next_step",
+  "genre",
+  "stage",
+  "store_url",
+  "url",
+  "preview_url",
+  "has_playable",
+  "media",
+  "platforms",
+  "monetization",
+  "preview_review",
+  "blocking",
+  "notes",
+  "critic",
+  "curator_note",
+  "pacts",
+  "warnings",
+  "updated_at",
+  "pact_changes"
+]

Changed16 schema fields changedOct 13, 2026

changedInput schema / properties / description / description

Previous value: -"What it is, what is weird about it, where it is going (60-4000 chars)"New value: +"What the game is, its audience and what creators can show (60-4000 chars)"

changedInput schema / properties / files / description

Previous value: -"Multi-file build instead of html; must include index.html at the root"New value: +"Optional multi-file playable version instead of html; must include index.html at the root"

changedInput schema / properties / html / description

Previous value: -"The whole game as one self-contained index.html (preferred). Max 8 MB."New value: +"Optional playable version hosted on FanZero, self-contained index.html, max 8 MB. Omit for an online game; list its existing platforms instead"

addedInput schema / properties / media

Added value: +{
+  "description": "Screenshots, gameplay and trailers. At least one when no optional playable version is supplied",
+  "items": {
+    "additionalProperties": false,
+    "properties": {
+      "alt": {
+        "maxLength": 200,
+        "type": "string"
+      },
+      "type": {
+        "enum": [
+          "image",
+          "video"
+        ],
+        "type": "string"
+      },
+      "url": {
+        "description": "Public HTTPS screenshot, gameplay or trailer URL; validated without fetching it",
+        "maxLength": 1000,
+        "type": "string"
+      }
+    },
+    "required": [
+      "type",
+      "url"
+    ],
+    "type": "object"
+  },
+  "maxItems": 12,
+  "type": "array"
+}

addedInput schema / properties / monetization

Added value: +{
+  "description": "Explain how the game earns revenue across platforms; do not guess an unknown price",
+  "maxLength": 600,
+  "type": "string"
+}

addedInput schema / properties / platforms

Added value: +{
+  "description": "Where to access/buy the actual game, each with its own price/model. At least one without a build",
+  "items": {
+    "additionalProperties": false,
+    "properties": {
+      "currency": {
+        "description": "Uppercase currency code, e.g. EUR or USD; required for a positive price",
+        "pattern": "^[A-Z]{3}$",
+        "type": "string"
+      },
+      "monetization": {
+        "enum": [
+          "paid",
+          "free",
+          "free_to_play",
+          "subscription",
+          "other"
+        ],
+        "type": "string"
+      },
+      "name": {
+        "maxLength": 60,
+        "minLength": 1,
+        "type": "string"
+      },
+      "note": {
+        "description": "Price conditions, subscription period or optional purchase details",
+        "maxLength": 400,
+        "type": "string"
+      },
+      "price": {
+        "description": "This platform's purchase price. Omit an unknown price; zero means explicitly zero, never an assumed free game",
+        "minimum": 0,
+        "type": "number"
+      },
+      "url": {
+        "description": "Public HTTPS game/store URL",
+        "maxLength": 1000,
+        "type": "string"
+      }
+    },
+    "required": [
+      "name",
+      "url"
+    ],
+    "type": "object"
+  },
+  "maxItems": 12,
+  "type": "array"
+}

addedInput schema / properties / resubmit

Added value: +{
+  "description": "For a metadata-only listing: rerun review with its current metadata",
+  "type": "boolean"
+}

changedInput schema / properties / stage / description

Previous value: -"Left out: prototype"New value: +"Optional. Omitted means not specified on a metadata-only listing; legacy playable submissions default to prototype"

changedInput schema / properties / stage / enum

Previous value: -[
-  "napkin",
-  "prototype",
-  "vertical-slice",
-  "alpha"
-]New value: +[
+  "napkin",
+  "prototype",
+  "vertical-slice",
+  "alpha",
+  "beta",
+  "released"
+]

addedOutput schema / properties / has_playable
```
Added value: +{
+  "type": "boolean"
+}
```

addedOutput schema / properties / media

Added value: +{
+  "items": {
+    "additionalProperties": false,
+    "properties": {
+      "alt": {
+        "maxLength": 200,
+        "type": "string"
+      },
+      "type": {
+        "enum": [
+          "image",
+          "video"
+        ],
+        "type": "string"
+      },
+      "url": {
+        "description": "Public HTTPS screenshot, gameplay or trailer URL; validated without fetching it",
+        "maxLength": 1000,
+        "type": "string"
+      }
+    },
+    "required": [
+      "type",
+      "url"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

addedOutput schema / properties / monetization
```
Added value: +{
+  "type": "string"
+}
```

addedOutput schema / properties / platforms

Added value: +{
+  "items": {
+    "additionalProperties": false,
+    "properties": {
+      "currency": {
+        "description": "Uppercase currency code, e.g. EUR or USD; required for a positive price",
+        "pattern": "^[A-Z]{3}$",
+        "type": "string"
+      },
+      "monetization": {
+        "enum": [
+          "paid",
+          "free",
+          "free_to_play",
+          "subscription",
+          "other"
+        ],
+        "type": "string"
+      },
+      "name": {
+        "maxLength": 60,
+        "minLength": 1,
+        "type": "string"
+      },
+      "note": {
+        "description": "Price conditions, subscription period or optional purchase details",
+        "maxLength": 400,
+        "type": "string"
+      },
+      "price": {
+        "description": "This platform's purchase price. Omit an unknown price; zero means explicitly zero, never an assumed free game",
+        "minimum": 0,
+        "type": "number"
+      },
+      "url": {
+        "description": "Public HTTPS game/store URL",
+        "maxLength": 1000,
+        "type": "string"
+      }
+    },
+    "required": [
+      "name",
+      "url"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

changedOutput schema / properties / preview_url / description

Previous value: -"The current build, playable in a browser"New value: +"Optional playable version; null for a listing without a build"

changedOutput schema / properties / preview_url / type

Previous value: -"string"New value: +[
+  "string",
+  "null"
+]

changedOutput schema / required

Previous value: -[
-  "game_id",
-  "slug",
-  "title",
-  "version",
-  "status",
-  "next_step",
-  "genre",
-  "stage",
-  "store_url",
-  "url",
-  "preview_url",
-  "blocking",
-  "notes",
-  "critic",
-  "curator_note",
-  "pacts",
-  "warnings",
-  "updated_at",
-  "pact_changes"
-]New value: +[
+  "game_id",
+  "slug",
+  "title",
+  "version",
+  "status",
+  "next_step",
+  "genre",
+  "stage",
+  "store_url",
+  "url",
+  "preview_url",
+  "has_playable",
+  "media",
+  "platforms",
+  "monetization",
+  "blocking",
+  "notes",
+  "critic",
+  "curator_note",
+  "pacts",
+  "warnings",
+  "updated_at",
+  "pact_changes"
+]

First observedOct 12, 2026

TDQS

A4.1/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Beyond the destructiveHint=true annotation, the description details exactly what survives a removal (listing status, pact windows, metadata; files and review retained for audit) and what is replaced (passing pacts replaces open offers while accepted agreements retain terms). It also discloses the review consequence of metadata-only edits and the mutual exclusion between remove_preview and html/files, which the schema does not enforce.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The central rule (remove_preview preserves links and pact windows) is front-loaded, but the prose is dense and repetitive — remove_preview and "original links are the default" are each stated twice, and the sentences are stacked without structure for a 21-parameter tool. Little is filler, but the density makes it harder to scan than a short bulleted ordering would.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 21-parameter mutation tool with nested objects, the description covers the highest-risk paths: preview retirement, agent HTML/file uploads and their review gate, and pact replacement. With an output schema present, return values need no explanation, and the remaining gaps (bulk field editing, idempotency of repeated calls) are modest against the 81% schema coverage.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is already 81%, so the baseline is 3, but the description adds genuine meaning: remove_preview is a retire-don't-delete operation, it conflicts with html/files, and preview_review is required for new agent uploads with all three flags true. It also explains the pacts replacement semantics that the schema only hints at, though several ordinary fields (title, genre, tags, description) are left to the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The opening clause "Change the listing or offers" gives a concrete verb and resource, and the body clarifies that this covers both metadata edits and preview retirement. It does not name the neighbouring submit_game/publish_game tools, so the agent must infer that update_game is the edit path rather than the submission path.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It gives real conditional guidance: use remove_preview to retire a demo rather than deleting the listing, agent html/files require preview_review, and metadata-only edits go back to curator review. What is missing is an explicit routing statement against the siblings (submit_game, publish_game, check_build) for cases that look like an update but are not.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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