MCP MeasureMCP Measure

index observed

Hydrogen Studies

Search, compare and summarize 2,200+ published studies on molecular hydrogen (H2) and health.

Should I use this

Quality & Safety

A
Description quality
86%
Schema completeness
79%
Naming quality
98%
Poisoning risk
100%
Permission match
100%
Protocol compliance
100%

Findings (3)

  • LOWTool 'get_condition_evidence' description lacks action verbin get_condition_evidence
  • LOWTool 'find_related_studies' description lacks action verbin find_related_studies
  • LOWTool 'get_database_stats' description lacks action verbin get_database_stats

Based on automated analysis of tool definitions and protocol compliance.

Context Cost

~2,108Tokens (tool definitions)
~2.3 KBTypical response size
Moderate attention impact (1.65% of 128k context)

This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.

Install

One-Click Install

Add this to your `claude_desktop_config.json` file:

{
  "mcpServers": {
    "research": {
      "url": "https://hydrogenstudies.com/mcp"
    }
  }
}

Remote endpoints

https://hydrogenstudies.com/mcpstreamable-http

What it can do

Tool inventory

Tools (8)

🟢 Read-only🟡 Write🔴 Delete⚪ Unknown
🟢search_studies(query, condition, subject, design, delivery_method, ...)

Find molecular hydrogen studies by keywords and/or filters. Returns compact study records (design, subject, sample size, delivery method, outcome, key finding, url). Sorted by relevance when a query is given, otherwise by strength of evidence.

Input Schema

{
  "type": "object",
  "properties": {
    "query": {
      "type": "string",
      "maxLength": 300,
      "description": "Full-text search terms, e.g. 'exercise fatigue lactate'"
    },
    "condition": {
      "type": "string",
      "maxLength": 100,
      "description": "Condition hub slug or name, e.g. 'blood-pressure' or 'Blood Pressure' (see list_conditions)"
    },
    "subject": {
      "type": "string",
      "enum": [
        "human",
        "animal",
        "in_vitro",
        "review"
      ],
      "description": "Who/what was studied"
    },
    "design": {
      "type": "string",
      "enum": [
        "rct",
        "controlled_trial",
        "uncontrolled_trial",
        "observational",
        "case_report",
        "meta_analysis",
        "review",
        "animal",
        "in_vitro",
        "other"
      ],
      "description": "Study design"
    },
    "delivery_method": {
      "type": "string",
      "enum": [
        "inhalation",
        "drinking_water",
        "hydrogen_saline",
        "culture_medium",
        "bathing",
        "topical",
        "tablet",
        "mixed",
        "other"
      ],
      "description": "How hydrogen was administered"
    },
    "outcome": {
      "type": "string",
      "enum": [
        "positive",
        "neutral",
        "negative",
        "mixed"
      ],
      "description": "Direction of the reported hydrogen effect"
    },
    "year_from": {
      "type": "integer",
      "minimum": 1900,
      "maximum": 2100
    },
    "year_to": {
      "type": "integer",
      "minimum": 1900,
      "maximum": 2100
    },
    "min_sample_size": {
      "type": "integer",
      "minimum": 1,
      "description": "Minimum participants/animals"
    },
    "sort": {
      "type": "string",
      "enum": [
        "relevance",
        "evidence",
        "newest",
        "quality"
      ]
    },
    "limit": {
      "type": "integer",
      "minimum": 1,
      "maximum": 50,
      "description": "Default 10"
    },
    "offset": {
      "type": "integer",
      "minimum": 0
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢get_study(study)

Full record for one study: citation, design, population, H2 protocol (delivery, concentration, dosage), outcome, our plain-language summary and key finding, limitations, quality score with red flags, conditions/mechanisms, and links. Accepts an id, slug, DOI or study URL.

Input Schema

{
  "type": "object",
  "properties": {
    "study": {
      "type": "string",
      "minLength": 1,
      "maxLength": 300,
      "description": "Study id, slug, DOI, or hydrogenstudies.com/study/... URL"
    }
  },
  "required": [
    "study"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢get_condition_evidence(condition, subject, top_studies)

Evidence profile for a health condition hub: how many studies, human vs animal vs in-vitro, number of human RCTs and participants, outcome mix, delivery methods, publication years, data coverage, and the strongest studies.

Input Schema

{
  "type": "object",
  "properties": {
    "condition": {
      "type": "string",
      "minLength": 1,
      "maxLength": 100,
      "description": "Condition hub slug or name (see list_conditions)"
    },
    "subject": {
      "type": "string",
      "enum": [
        "human",
        "animal",
        "in_vitro",
        "review"
      ],
      "description": "Restrict the profile to one subject type"
    },
    "top_studies": {
      "type": "integer",
      "minimum": 1,
      "maximum": 20,
      "description": "How many strongest studies to list (default 5)"
    }
  },
  "required": [
    "condition"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢compare_evidence(shared, groups, top_studies)

Side-by-side evidence profiles for 2–4 groups of studies, e.g. inhalation vs drinking water for one condition, or two conditions. Each group is a set of filters merged over the optional shared filters.

Input Schema

{
  "type": "object",
  "properties": {
    "shared": {
      "type": "object",
      "properties": {
        "query": {
          "type": "string",
          "maxLength": 300,
          "description": "Full-text search terms, e.g. 'exercise fatigue lactate'"
        },
        "condition": {
          "type": "string",
          "maxLength": 100,
          "description": "Condition hub slug or name, e.g. 'blood-pressure' or 'Blood Pressure' (see list_conditions)"
        },
        "subject": {
          "type": "string",
          "enum": [
            "human",
            "animal",
            "in_vitro",
            "review"
          ],
          "description": "Who/what was studied"
        },
        "design": {
          "type": "string",
          "enum": [
            "rct",
            "controlled_trial",
            "uncontrolled_trial",
            "observational",
            "case_report",
            "meta_analysis",
            "review",
            "animal",
            "in_vitro",
            "other"
          ],
          "description": "Study design"
        },
        "delivery_method": {
          "type": "string",
          "enum": [
            "inhalation",
            "drinking_water",
            "hydrogen_saline",
            "culture_medium",
            "bathing",
            "topical",
            "tablet",
            "mixed",
            "other"
          ],
          "description": "How hydrogen was administered"
        },
        "outcome": {
          "type": "string",
          "enum": [
            "positive",
            "neutral",
            "negative",
            "mixed"
          ],
          "description": "Direction of the reported hydrogen effect"
        },
        "year_from": {
          "type": "integer",
          "minimum": 1900,
          "maximum": 2100
        },
        "year_to": {
          "type": "integer",
          "minimum": 1900,
          "maximum": 2100
        },
        "min_sample_size": {
          "type": "integer",
          "minimum": 1,
          "description": "Minimum participants/animals"
        }
      },
      "additionalProperties": false,
      "description": "Filters applied to every group"
    },
    "groups": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "query": {
            "$ref": "#/properties/shared/properties/query"
          },
          "condition": {
            "$ref": "#/properties/shared/properties/condition"
          },
          "subject": {
            "$ref": "#/properties/shared/properties/subject"
          },
          "design": {
            "$ref": "#/properties/shared/properties/design"
          },
          "delivery_method": {
            "$ref": "#/properties/shared/properties/delivery_method"
          },
          "outcome": {
            "$ref": "#/properties/shared/properties/outcome"
          },
          "year_from": {
            "$ref": "#/properties/shared/properties/year_from"
          },
          "year_to": {
            "$ref": "#/properties/shared/properties/year_to"
          },
          "min_sample_size": {
            "$ref": "#/properties/shared/properties/min_sample_size"
          },
          "label": {
            "type": "string",
            "minLength": 1,
            "maxLength": 60
          }
        },
        "required": [
          "label"
        ],
        "additionalProperties": false
      },
      "minItems": 2,
      "maxItems": 4
    },
    "top_studies": {
      "type": "integer",
      "minimum": 0,
      "maximum": 10,
      "description": "Strongest studies listed per group (default 3)"
    }
  },
  "required": [
    "groups"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢aggregate_studies(query, condition, subject, design, delivery_method, ...)

Count matching studies grouped by year, subject, design, delivery_method, outcome, country, condition or species — for trends and 'how many' questions. Unknown values are counted separately.

Input Schema

{
  "type": "object",
  "properties": {
    "query": {
      "type": "string",
      "maxLength": 300,
      "description": "Full-text search terms, e.g. 'exercise fatigue lactate'"
    },
    "condition": {
      "type": "string",
      "maxLength": 100,
      "description": "Condition hub slug or name, e.g. 'blood-pressure' or 'Blood Pressure' (see list_conditions)"
    },
    "subject": {
      "type": "string",
      "enum": [
        "human",
        "animal",
        "in_vitro",
        "review"
      ],
      "description": "Who/what was studied"
    },
    "design": {
      "type": "string",
      "enum": [
        "rct",
        "controlled_trial",
        "uncontrolled_trial",
        "observational",
        "case_report",
        "meta_analysis",
        "review",
        "animal",
        "in_vitro",
        "other"
      ],
      "description": "Study design"
    },
    "delivery_method": {
      "type": "string",
      "enum": [
        "inhalation",
        "drinking_water",
        "hydrogen_saline",
        "culture_medium",
        "bathing",
        "topical",
        "tablet",
        "mixed",
        "other"
      ],
      "description": "How hydrogen was administered"
    },
    "outcome": {
      "type": "string",
      "enum": [
        "positive",
        "neutral",
        "negative",
        "mixed"
      ],
      "description": "Direction of the reported hydrogen effect"
    },
    "year_from": {
      "type": "integer",
      "minimum": 1900,
      "maximum": 2100
    },
    "year_to": {
      "type": "integer",
      "minimum": 1900,
      "maximum": 2100
    },
    "min_sample_size": {
      "type": "integer",
      "minimum": 1,
      "description": "Minimum participants/animals"
    },
    "group_by": {
      "type": "string",
      "enum": [
        "year",
        "subject",
        "design",
        "delivery_method",
        "outcome",
        "country",
        "condition",
        "species"
      ]
    },
    "top": {
      "type": "integer",
      "minimum": 1,
      "maximum": 100,
      "description": "Max buckets returned (default 40)"
    }
  },
  "required": [
    "group_by"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢find_related_studies(study)

Studies a given study cites, studies that cite it, and the most similar studies by shared health conditions.

Input Schema

{
  "type": "object",
  "properties": {
    "study": {
      "type": "string",
      "minLength": 1,
      "maxLength": 300,
      "description": "Study id, slug, DOI or URL"
    }
  },
  "required": [
    "study"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢list_conditions

Every health condition hub with its study count, evidence grade (where reviewed) and page URL. Use the slug as the `condition` filter.

Input Schema

{
  "type": "object",
  "properties": {},
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢get_database_stats

Size and makeup of the database: total studies, breakdown by subject and design, year range, and field coverage.

Input Schema

{
  "type": "object",
  "properties": {},
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Community

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Evidence

Recent observations

verifiedversion not recorded8 tools