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congressgov-mcp-server

by io.github.cyanheads
OverviewDiscussionsAdmin

Congress.gov Member Lookup

congressgov_member_lookup
Read-onlyIdempotent

Discover congressional members and their legislative activity. No name search. For 'list', filter by stateCode (optionally with district), by congress, or by both together (e.g., 118th Congress + CA, or CA district 12 in the 118th). Add currentMember=true to restrict to currently serving members. Once you have a bioguideId, use 'get' for full profile or 'sponsored'/'cosponsored' for their legislative portfolio.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
limitNoResults per page (1-250).
offsetNoPagination offset.
congressNoCongress number to filter by.
districtNoCongressional district number. Requires stateCode. Use 0 for at-large.
operationYesWhich data to retrieve.
stateCodeNoTwo-letter state code (e.g., 'CA', 'TX').
bioguideIdNoUnique member identifier (e.g., 'P000197'). Required for get/sponsored/cosponsored.
currentMemberNoFilter to currently serving members. Omit to include both current and former members.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
dataNoResult rows. Per-tool item shape is rendered in the markdown body.
errorNoPresent when the call failed. Absent on success.
memberNoDynamic upstream JSON record.
noticeNoGuidance when results are empty, a page is past the end, or a caveat applies.
paginationNoPagination metadata: total count and next offset.
totalCountNoTotal results across all pages.
effectiveQueryNoThe browse scope and applied filters.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changed
    • changedOutput schema / properties / error / properties / data / properties / reason / description
      Previous value: -"Machine-readable failure mode. Declared by this tool: `not_found`: A requested bill, member, committee, report, vote, or nomination does not exist in Congress.gov. `rate_limited`: The Congress.gov API rate limit (5,000 requests/hour per key) was exceeded. `invalid_request`: Congress.gov rejected the request as malformed — a bad date range or an identifier with an unexpected shape. `upstream_error`: Congress.gov returned an unexpected error (5xx or another non-2xx status). Other values are possible when a failure originates below the handler."New value: +"Machine-readable failure mode. Declared by this tool: `not_found`: A requested bill, member, committee, report, vote, or nomination does not exist in Congress.gov. `rate_limited`: A process-local attempt budget or the shared upstream credential/IP quota was reached; upstream hourly limits vary and DEMO_KEY also has a daily quota. `invalid_request`: Congress.gov rejected the request as malformed — a bad date range or an identifier with an unexpected shape. `upstream_error`: Congress.gov returned an unexpected error (5xx or another non-2xx status). `upstream_timeout`: The Congress.gov request deadline expired or the upstream returned an HTTP timeout response. Other values are possible when a failure originates below the handler."
    • changedOutput schema / properties / error / properties / data / properties / reason / examples
      Previous value: -[
-  "not_found",
-  "rate_limited",
-  "invalid_request",
-  "upstream_error"
-]New value: +[
+  "not_found",
+  "rate_limited",
+  "invalid_request",
+  "upstream_error",
+  "upstream_timeout"
+]
  2. Changed5 schema fields changed
    • addedInput schema / properties / bioguideId / pattern
      Added value: +"^[A-Za-z]\\d{6}$"
    • removedInput schema / properties / stateCode / maxLength
      Removed value: -2
    • removedInput schema / properties / stateCode / minLength
      Removed value: -2
    • addedInput schema / properties / stateCode / pattern
      Added value: +"^[A-Za-z]{2}$"
    • addedOutput schema / properties / member
      Added value: +{
+  "additionalProperties": {},
+  "description": "Dynamic upstream JSON record.",
+  "properties": {},
+  "type": "object"
+}
  3. Changed6 schema fields changed
    • changedInput schema / $schema
      Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"
    • addedInput schema / additionalProperties
      Added value: +false
    • changedOutput schema / $schema
      Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"
    • addedOutput schema / anyOf
      Added value: +[
+  {
+    "not": {
+      "required": [
+        "error"
+      ]
+    },
+    "required": [
+      "effectiveQuery",
+      "totalCount"
+    ]
+  },
+  {
+    "required": [
+      "error"
+    ]
+  }
+]
    • addedOutput schema / properties / error
      Added value: +{
+  "additionalProperties": {},
+  "description": "Present when the call failed. Absent on success.",
+  "properties": {
+    "code": {
+      "description": "JSON-RPC error code for this failure.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "data": {
+      "additionalProperties": {},
+      "properties": {
+        "reason": {
+          "description": "Machine-readable failure mode. Declared by this tool: `not_found`: A requested bill, member, committee, report, vote, or nomination does not exist in Congress.gov. `rate_limited`: The Congress.gov API rate limit (5,000 requests/hour per key) was exceeded. `invalid_request`: Congress.gov rejected the request as malformed — a bad date range or an identifier with an unexpected shape. `upstream_error`: Congress.gov returned an unexpected error (5xx or another non-2xx status). Other values are possible when a failure originates below the handler.",
+          "examples": [
+            "not_found",
+            "rate_limited",
+            "invalid_request",
+            "upstream_error"
+          ],
+          "type": "string"
+        },
+        "recovery": {
+          "additionalProperties": {},
+          "description": "Actionable next step for the caller.",
+          "properties": {
+            "hint": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "hint"
+          ],
+          "type": "object"
+        },
+        "retryable": {
+          "description": "Whether retrying may succeed.",
+          "type": "boolean"
+        }
+      },
+      "type": "object"
+    },
+    "message": {
+      "description": "Human-readable description of what went wrong.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "code",
+    "message"
+  ],
+  "type": "object"
+}
    • removedOutput schema / required
      Removed value: -[
-  "effectiveQuery",
-  "totalCount"
-]
  4. Changed6 schema fields changed
    • removedOutput schema / description
      Removed value: -"Detail-mode key 'member' carries: Member profile for `get` (name, state, terms, party history, leadership, legislation counts); absent for `list`, `sponsored`, `cosponsored`."
    • addedOutput schema / properties / effectiveQuery
      Added value: +{
+  "description": "The browse scope and applied filters.",
+  "type": "string"
+}
    • addedOutput schema / properties / notice
      Added value: +{
+  "description": "Guidance when results are empty, a page is past the end, or a caveat applies.",
+  "type": "string"
+}
    • removedOutput schema / properties / query
      Removed value: -{
-  "description": "Echo of the applied filters for list-mode queries. Rendered as the first line of the response.",
-  "type": "string"
-}
    • addedOutput schema / properties / totalCount
      Added value: +{
+  "description": "Total results across all pages.",
+  "type": "number"
+}
    • addedOutput schema / required
      Added value: +[
+  "effectiveQuery",
+  "totalCount"
+]
  5. Changed4 schema fields changed
    • changedOutput schema / description
      Previous value: -"Member data from Congress.gov API."New value: +"Detail-mode key 'member' carries: Member profile for `get` (name, state, terms, party history, leadership, legislation counts); absent for `list`, `sponsored`, `cosponsored`."
    • addedOutput schema / properties / data
      Added value: +{
+  "description": "Result rows. Per-tool item shape is rendered in the markdown body.",
+  "items": {
+    "additionalProperties": {},
+    "description": "Upstream JSON record. Per-tool item shape is rendered in the markdown body.",
+    "properties": {},
+    "type": "object"
+  },
+  "type": "array"
+}
    • addedOutput schema / properties / pagination
      Added value: +{
+  "additionalProperties": false,
+  "description": "Pagination metadata: total count and next offset.",
+  "properties": {
+    "count": {
+      "description": "Total result count across all pages.",
+      "maximum": 9007199254740991,
+      "minimum": 0,
+      "type": "integer"
+    },
+    "nextOffset": {
+      "anyOf": [
+        {
+          "maximum": 9007199254740991,
+          "minimum": 0,
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Offset to pass for the next page, or null when there are no more pages."
+    }
+  },
+  "required": [
+    "count"
+  ],
+  "type": "object"
+}
    • addedOutput schema / properties / query
      Added value: +{
+  "description": "Echo of the applied filters for list-mode queries. Rendered as the first line of the response.",
+  "type": "string"
+}
  6. Changed3 schema fields changed
    • removedOutput schema / properties / data
      Removed value: -{
-  "description": "Paginated member or legislation results. Preserves upstream item shapes.",
-  "items": {},
-  "type": "array"
-}
    • removedOutput schema / properties / member
      Removed value: -{
-  "additionalProperties": {},
-  "description": "Member profile detail when operation=\"get\".",
-  "propertyNames": {
-    "type": "string"
-  },
-  "type": "object"
-}
    • removedOutput schema / properties / pagination
      Removed value: -{
-  "additionalProperties": false,
-  "description": "Pagination metadata for list, sponsored, and cosponsored operations.",
-  "properties": {
-    "count": {
-      "description": "Total number of matching members or bills.",
-      "maximum": 9007199254740991,
-      "minimum": 0,
-      "type": "integer"
-    },
-    "nextOffset": {
-      "anyOf": [
-        {
-          "maximum": 9007199254740991,
-          "minimum": 0,
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "description": "Offset to request the next page, or null when there is no next page."
-    }
-  },
-  "required": [
-    "count",
-    "nextOffset"
-  ],
-  "type": "object"
-}
  7. Changed4 schema fields changed
    • changedInput schema / properties / currentMember / description
      Previous value: -"Filter to currently serving members. Defaults to false."New value: +"Filter to currently serving members. Omit to include both current and former members."
    • addedOutput schema / properties / data
      Added value: +{
+  "description": "Paginated member or legislation results. Preserves upstream item shapes.",
+  "items": {},
+  "type": "array"
+}
    • addedOutput schema / properties / member
      Added value: +{
+  "additionalProperties": {},
+  "description": "Member profile detail when operation=\"get\".",
+  "propertyNames": {
+    "type": "string"
+  },
+  "type": "object"
+}
    • addedOutput schema / properties / pagination
      Added value: +{
+  "additionalProperties": false,
+  "description": "Pagination metadata for list, sponsored, and cosponsored operations.",
+  "properties": {
+    "count": {
+      "description": "Total number of matching members or bills.",
+      "maximum": 9007199254740991,
+      "minimum": 0,
+      "type": "integer"
+    },
+    "nextOffset": {
+      "anyOf": [
+        {
+          "maximum": 9007199254740991,
+          "minimum": 0,
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Offset to request the next page, or null when there is no next page."
+    }
+  },
+  "required": [
+    "count",
+    "nextOffset"
+  ],
+  "type": "object"
+}
  8. First observed

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