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search_users

Search Gelbooru users by exact username or wildcard pattern to find specific contributors or user profiles on the image board.

Instructions

Search Gelbooru users by name or name pattern.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameNoExact username to search for.
name_patternNoWildcard username search (SQL LIKE syntax).
limitNo
pidNo

Implementation Reference

  • Handler implementation for search_users tool. Constructs API parameters for Gelbooru user search, accepts name, name_pattern, limit, and pid arguments, and executes the request via _get helper.
    elif name == "search_users":
        params = {"page": "dapi", "s": "user", "q": "index"}
        for key in ("name", "name_pattern", "limit", "pid"):
            if key in arguments:
                params[key] = arguments[key]
        result = await loop.run_in_executor(None, _get, params)
  • Tool schema definition for search_users. Defines the tool name, description, and input parameters including name (exact username), name_pattern (wildcard search), limit (results per page), and pid (page offset).
    Tool(
        name="search_users",
        description="Search Gelbooru users by name or name pattern.",
        inputSchema={
            "type": "object",
            "properties": {
                "name": {
                    "type": "string",
                    "description": "Exact username to search for.",
                },
                "name_pattern": {
                    "type": "string",
                    "description": "Wildcard username search (SQL LIKE syntax).",
                },
                "limit": {"type": "integer", "default": 20, "minimum": 1, "maximum": 100},
                "pid": {"type": "integer", "default": 0},
            },
        },
    ),
  • Tool registration point - the list_tools() function decorated with @server.list_tools() that returns all available tools including search_users.
    @server.list_tools()
    async def list_tools() -> list[Tool]:
        return [
            Tool(
                name="search_posts",
                description=(
                    "Search Gelbooru posts by tags, page, limit, or ID. "
                    "Supports all Gelbooru tag syntax: AND (tag1 tag2), OR ({t1~t2}), "
                    "NOT (-tag), wildcards (*tag / tag*), meta-tags like "
                    "rating:safe/questionable/explicit, score:>=N, width:>=N, "
                    "user:name, sort:random, sort:score:desc, etc."
                ),
                inputSchema={
                    "type": "object",
                    "properties": {
                        "tags": {
                            "type": "string",
                            "description": (
                                "Tag query string. Examples: 'cat_ears blue_eyes', "
                                "'touhou -rating:explicit', 'score:>=50 sort:score:desc'"
                            ),
                        },
                        "limit": {
                            "type": "integer",
                            "description": "Number of posts to return (default 20, max 100).",
                            "default": 20,
                            "minimum": 1,
                            "maximum": 100,
                        },
                        "pid": {
                            "type": "integer",
                            "description": "Page number (0-indexed).",
                            "default": 0,
                        },
                        "id": {
                            "type": "integer",
                            "description": "Fetch a single post by its Gelbooru ID.",
                        },
                        "cid": {
                            "type": "integer",
                            "description": "Fetch posts by change ID (Unix timestamp).",
                        },
                    },
                },
            ),
            Tool(
                name="get_deleted_posts",
                description=(
                    "Retrieve deleted posts. Pass last_id to get everything deleted "
                    "above that post ID."
                ),
                inputSchema={
                    "type": "object",
                    "properties": {
                        "last_id": {
                            "type": "integer",
                            "description": "Return deleted posts whose ID is above this value.",
                        },
                        "limit": {"type": "integer", "default": 20, "minimum": 1, "maximum": 100},
                    },
                },
            ),
            Tool(
                name="search_tags",
                description=(
                    "Search Gelbooru tags by name, pattern, or ID. "
                    "Useful for autocomplete, tag counts, and tag type lookup."
                ),
                inputSchema={
                    "type": "object",
                    "properties": {
                        "name": {
                            "type": "string",
                            "description": "Exact tag name to look up.",
                        },
                        "names": {
                            "type": "string",
                            "description": "Space-separated list of tag names, e.g. 'cat dog fox'.",
                        },
                        "name_pattern": {
                            "type": "string",
                            "description": (
                                "Wildcard tag search using SQL LIKE syntax. "
                                "Use % for multi-char wildcard, _ for single-char. "
                                "Example: '%choolgirl%'"
                            ),
                        },
                        "id": {
                            "type": "integer",
                            "description": "Look up a tag by its database ID.",
                        },
                        "after_id": {
                            "type": "integer",
                            "description": "Return tags whose ID is greater than this value.",
                        },
                        "limit": {"type": "integer", "default": 20, "minimum": 1, "maximum": 100},
                        "order": {
                            "type": "string",
                            "enum": ["ASC", "DESC"],
                            "description": "Sort direction.",
                        },
                        "orderby": {
                            "type": "string",
                            "enum": ["date", "count", "name"],
                            "description": "Field to sort by.",
                        },
                    },
                },
            ),
            Tool(
                name="search_users",
                description="Search Gelbooru users by name or name pattern.",
                inputSchema={
                    "type": "object",
                    "properties": {
                        "name": {
                            "type": "string",
                            "description": "Exact username to search for.",
                        },
                        "name_pattern": {
                            "type": "string",
                            "description": "Wildcard username search (SQL LIKE syntax).",
                        },
                        "limit": {"type": "integer", "default": 20, "minimum": 1, "maximum": 100},
                        "pid": {"type": "integer", "default": 0},
                    },
                },
            ),
            Tool(
                name="get_comments",
                description="Retrieve comments for a specific Gelbooru post.",
                inputSchema={
                    "type": "object",
                    "properties": {
                        "post_id": {
                            "type": "integer",
                            "description": "The post ID whose comments you want to retrieve.",
                        },
                    },
                    "required": ["post_id"],
                },
            ),
            Tool(
                name="get_character_tags",
                description=(
                    "Given a character name (e.g. 'misty_(pokemon)'), fetches the top "
                    "highest-scored general/solo posts across multiple pages and returns "
                    "the most frequently occurring tags split into three semantic buckets: "
                    "eye colour/shape, hair colour/style, and other character traits. "
                    "Each tag includes a frequency score. Results are cached to disk for 24 hours."
                ),
                inputSchema={
                    "type": "object",
                    "properties": {
                        "character_name": {
                            "type": "string",
                            "description": (
                                "The Gelbooru tag for the character, e.g. 'misty_(pokemon)', "
                                "'rem_(re:zero)', 'saber_(fate)'. Use underscores as Gelbooru does."
                            ),
                        },
                        "max_images": {
                            "type": "integer",
                            "description": (
                                "How many top-scored posts to analyse across all pages "
                                "(default 300). More images = slower but more reliable results. "
                                "Fetched in pages of 100."
                            ),
                            "default": 300,
                            "minimum": 10,
                        },
                    },
                    "required": ["character_name"],
                },
            ),
            Tool(
                name="build_prompt",
                description=(
                    "Given a character name, returns a ready-to-use image-generation prompt "
                    "string like 'misty (pokemon), green eyes, orange hair, side ponytail, ...'. "
                    "Internally calls get_character_tags with caching, then assembles the prompt "
                    "with tags ordered by frequency (eye → hair → other)."
                ),
                inputSchema={
                    "type": "object",
                    "properties": {
                        "character_name": {
                            "type": "string",
                            "description": (
                                "The Gelbooru tag for the character, e.g. 'misty_(pokemon)'. "
                                "Use underscores as Gelbooru does."
                            ),
                        },
                        "max_images": {
                            "type": "integer",
                            "description": "Posts to analyse (default 300). Cached after first fetch.",
                            "default": 300,
                            "minimum": 10,
                        },
                        "include_other": {
                            "type": "boolean",
                            "description": (
                                "Whether to include non-eye/hair tags (clothing, accessories, etc.) "
                                "in the prompt. Default true."
                            ),
                            "default": True,
                        },
                    },
                    "required": ["character_name"],
                },
            ),
        ]
  • Helper function _get used by search_users handler. Performs synchronous HTTP GET requests to Gelbooru API, handles authentication, and returns parsed JSON response.
    def _get(params: dict) -> Any:
        """Perform a synchronous HTTP GET and return parsed JSON."""
        params = {**params, "json": "1"}   # copy — never mutate the caller's dict
        _build_auth(params)
        url = f"{BASE_URL}?{urlencode(params)}"
        req = Request(url, headers={"User-Agent": "GelbooruMCP/1.0"})
        try:
            with urlopen(req, timeout=15) as resp:
                raw = resp.read().decode("utf-8")
        except URLError as exc:
            return {"error": str(exc)}
        try:
            return json.loads(raw)
        except json.JSONDecodeError:
            # Some endpoints return XML/empty on error; surface the raw text
            return {"raw": raw}
Behavior2/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states the search functionality but doesn't mention whether this is a read-only operation, what permissions are needed, rate limits, pagination behavior (implied by 'limit' and 'pid' parameters but not explained), or what the output format looks like. For a search tool with 4 parameters and no annotations, this leaves significant gaps in understanding how the tool behaves.

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

Conciseness5/5

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

The description is a single, efficient sentence that directly states the tool's function without unnecessary words. It's appropriately sized and front-loaded, with every word contributing to understanding the tool's purpose.

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

Completeness2/5

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

Given the tool's complexity (4 parameters, no output schema, no annotations), the description is insufficient. It doesn't explain the return values, how results are structured, or behavioral aspects like pagination (implied by 'pid' but not described). For a search tool with multiple parameters and no structured output documentation, more context is needed to be complete.

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

Parameters3/5

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

The description mentions searching by 'name or name pattern', which aligns with the 'name' and 'name_pattern' parameters in the schema. However, schema description coverage is only 50% (2 out of 4 parameters have descriptions), and the description doesn't add meaning for 'limit' or 'pid' beyond what the schema provides. It compensates slightly but not fully for the coverage gap, meeting the baseline for moderate schema coverage.

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 description clearly states the tool's purpose: searching Gelbooru users by name or name pattern. It specifies the resource (users) and the search criteria (name/name_pattern), making the verb+resource combination explicit. However, it doesn't differentiate from sibling tools like search_posts or search_tags, which would require a 5.

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

Usage Guidelines2/5

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

The description provides no guidance on when to use this tool versus alternatives. There's no mention of prerequisites, when-not-to-use scenarios, or comparisons with sibling tools like get_comments or get_character_tags that might involve user data. Usage is implied by the search functionality but not explicitly defined.

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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