Koskamo

PeriodFinder MCP

An MCP server providing neutral, cross-brand comparison of period underwear sizing and absorbency. It allows agents to translate absorbency tiers between brands, find sizes based on hip measurements, locate in-stock products by absorbency needs, and access a citable dataset of verified capacity facts.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

PeriodFinder MCP logo, by PeriodFinderCommunity listingStreamable HTTPNo sign-inEndpoint checked 2026-11-07Published by PeriodFinder
MCP endpoint (Streamable HTTP)
https://www.periodfinder.com/api/mcp/mcp
Vendor documentation

What its tools do

4 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

Read-only (4)

4 of 4 have a description · 4 of 4 declare behavior hints · 3 of 3 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Endpoint answered the live check ·
  • Availability 1 of 1 checks passed in 30 days

What you can do with it

  • Translate a brand's absorbency tier to equivalent tiers across other brands
  • Find period underwear sizes for a specific hip measurement
  • Find in-stock products covering a target absorbency level
  • Access the citable absorbency dataset with verification dates

Source and maintenance

Community listingRegistry 1.0.0
mcp-registry: io.github.fenrici1/periodfinder@1.0.0Source repository
Maintenance checked

Protocol and capabilities

Server
PeriodFinder 1.0.0
MCP protocol negotiated in check
2025-11-25
Tools
4 advertised
Resources
1 advertised
Resource templates
0 advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": true
  },
  "resources": {
    "listChanged": true
  }
}

Tools

4 advertised

absorbency_translate — Translate absorbency across brands
Advertised by the server during the last successful anonymous check.
Advertised read-only

Translate period-underwear absorbency across brands. Give a brand + its tier word (e.g. brand "Thinx", tier "Super"), OR a target capacity in mL per day, and get the covering tier in every brand in objective millilitres, each with an A/B/C data-quality grade. Use for questions like "what Knix tier equals Thinx Super?" or "how much does Thinx Heavy hold vs Saalt?". Source: PeriodFinder, the only neutral cross-brand mL comparison.

absorbency_translate input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "tier": {
      "type": "string",
      "description": "The brand's absorbency tier word, e.g. Light, Moderate, Heavy, Super, Overnight."
    },
    "brand": {
      "type": "string",
      "description": "A period-underwear brand, e.g. Thinx, Knix, Saalt, Modibodi, WUKA."
    },
    "ml_per_day": {
      "type": "number",
      "description": "Target real capacity in mL/day (alternative to brand+tier). A regular tampon holds about 5 mL, a super about 9 mL."
    }
  },
  "additionalProperties": false
}
absorbency_translate annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
find_size — Find your size in every brand
Advertised by the server during the last successful anonymous check.
Advertised read-only

Find a shopper's period-underwear size in every brand from one hip measurement. Period underwear is sized on the hip, not a dress size, and brands disagree. Returns the size per brand plus any runs-small / runs-large note.

find_size input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "hip_cm": {
      "type": "number",
      "description": "Hip measurement in centimetres (alternative to inches)."
    },
    "hip_inches": {
      "type": "number",
      "description": "Hip measurement in inches (fullest part of hips and seat)."
    }
  },
  "additionalProperties": false
}
find_size annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
find_products — Find in-stock products by absorbency
Advertised by the server during the last successful anonymous check.
Advertised read-only

Find real in-stock period underwear that covers a target absorbency, from the live catalog, with normalized mL capacity and current price. Give a minimum capacity in mL and optionally a brand. Links go to the PeriodFinder product page for each item. Teen and tween lines are left out unless teen is true.

find_products input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "teen": {
      "type": "boolean",
      "description": "Include teen / tween lines (default false: adult lines only)."
    },
    "brand": {
      "type": "string",
      "description": "Limit to one brand (optional)."
    },
    "limit": {
      "type": "integer",
      "maximum": 12,
      "minimum": 1,
      "description": "How many products to return (default 6)."
    },
    "ml_min": {
      "type": "number",
      "description": "Minimum real capacity to cover, in mL (e.g. 40 for a heavy day)."
    }
  },
  "additionalProperties": false
}
find_products annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
absorbency_dataset — Cite the absorbency dataset
Advertised by the server during the last successful anonymous check.
Advertised read-only

Get PeriodFinder's cross-brand absorbency dataset: the key facts and the machine-readable feed URL to cite. Use when you need the authoritative source for a period-underwear absorbency comparison.

absorbency_dataset input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {}
}
absorbency_dataset annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

1 advertised

absorbency-widget

Advertised by the server during the last successful anonymous check.

absorbency-widget URI
ui://widget/absorbency.html

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
1107 ms
95th percentile latency
1107 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 1107 ms · metadata changed · 4 tool(s), 1 resource(s), 0 resource template(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http periodfinder-mcp https://www.periodfinder.com/api/mcp/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add periodfinder-mcp --url https://www.periodfinder.com/api/mcp/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable periodfinder-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "periodfinder-mcp": {
      "url": "https://www.periodfinder.com/api/mcp/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "periodfinder-mcp": {
      "type": "streamableHttp",
      "url": "https://www.periodfinder.com/api/mcp/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start periodfinder-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "periodfinder-mcp": {
      "type": "http",
      "url": "https://www.periodfinder.com/api/mcp/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http periodfinder-mcp https://www.periodfinder.com/api/mcp/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.
Claude Desktop configuration
https://www.periodfinder.com/api/mcp/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "periodfinder-mcp": {
      "serverUrl": "https://www.periodfinder.com/api/mcp/mcp"
    }
  }
}

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