signals

Search investors

investors

Read-only

Search and filter investor records by keyword, type, HQ country, or exact domain. Costs one credit per returned record.

Input Schema

Name	Required	Description
`type`	No	Investor type filters. Canonical values: vc, angel, cvc, pe, growth, accelerator, family_office, syndicate, unknown.
`limit`	No	Maximum records to return (1-100). Each returned record costs one credit.
`since`	No	Return investors created/updated on or after this date (YYYY-MM-DD) or ISO-8601 timestamp.
`cursor`	No	Opaque pagination cursor returned as pagination.nextCursor on the previous page.
`domain`	No	Exact investor domain.
`search`	No	Keyword search over investor name and domain.
`countries`	No	Headquarters country codes (ISO alpha-2, OR). Pass "unknown" to include companies with no country on file.
`investsIn`	No	Only investors that have funded companies headquartered in these countries (OR), e.g. ["US"]. Filters on where an investor deploys rather than where it is registered, and is far better covered than HQ country.
`minRounds`	No	Only investors that have participated in at least this many rounds.
`activeSince`	No	Only investors whose most recent round was announced on or after this date (YYYY-MM-DD).
`minRoundUsd`	No	Only investors that have participated in at least one round at or above this amount, in whole USD. Filters on behaviour rather than on a type label, which is sparse.
`includeTotal`	No	Also return pagination.total, the number of records matching these filters across all pages. Costs no credits.
`hasFirmographics`	No	Only investors whose domain and type we have resolved.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedSep 29, 2026

addedInput schema / properties / includeTotal

Added value: +{
+  "description": "Also return pagination.total, the number of records matching these filters across all pages. Costs no credits.",
+  "type": "boolean"
+}

Changed2 schema fields changedAug 27, 2026

changedInput schema / properties / countries / items / enum

Previous value: -[
-  "unknown",
-  "AD",
-  "AE",
-  "AF",
-  "AG",
-  "AL",
-  "AM",
-  "AO",
-  "AR",
-  "AT",
-  "AU",
-  "AZ",
-  "BA",
-  "BB",
-  "BD",
-  "BE",
-  "BF",
-  "BG",
-  "BH",
-  "BI",
-  "BJ",
-  "BM",
-  "BN",
-  "BO",
-  "BR",
-  "BS",
-  "BT",
-  "BW",
-  "BY",
-  "BZ",
-  "CA",
-  "CD",
-  "CF",
-  "CG",
-  "CH",
-  "CI",
-  "CL",
-  "CM",
-  "CN",
-  "CO",
-  "CR",
-  "CU",
-  "CV",
-  "CY",
-  "CZ",
-  "DE",
-  "DJ",
-  "DK",
-  "DM",
-  "DO",
-  "DZ",
-  "EC",
-  "EE",
-  "EG",
-  "ER",
-  "ES",
-  "ET",
-  "FI",
-  "FJ",
-  "FM",
-  "FR",
-  "GA",
-  "GB",
-  "GD",
-  "GE",
-  "GG",
-  "GH",
-  "GI",
-  "GM",
-  "GN",
-  "GQ",
-  "GR",
-  "GT",
-  "GW",
-  "GY",
-  "HK",
-  "HN",
-  "HR",
-  "HT",
-  "HU",
-  "ID",
-  "IE",
-  "IL",
-  "IM",
-  "IN",
-  "IQ",
-  "IR",
-  "IS",
-  "IT",
-  "JE",
-  "JM",
-  "JO",
-  "JP",
-  "KE",
-  "KG",
-  "KH",
-  "KI",
-  "KM",
-  "KN",
-  "KP",
-  "KR",
-  "KW",
-  "KY",
-  "KZ",
-  "LA",
-  "LB",
-  "LC",
-  "LI",
-  "LK",
-  "LR",
-  "LS",
-  "LT",
-  "LU",
-  "LV",
-  "LY",
-  "MA",
-  "MC",
-  "MD",
-  "ME",
-  "MG",
-  "MH",
-  "MK",
-  "ML",
-  "MM",
-  "MN",
-  "MO",
-  "MR",
-  "MT",
-  "MU",
-  "MV",
-  "MW",
-  "MX",
-  "MY",
-  "MZ",
-  "NA",
-  "NE",
-  "NG",
-  "NI",
-  "NL",
-  "NO",
-  "NP",
-  "NR",
-  "NZ",
-  "OM",
-  "PA",
-  "PG",
-  "PH",
-  "PK",
-  "PL",
-  "PR",
-  "PS",
-  "PT",
-  "PW",
-  "PY",
-  "QA",
-  "RO",
-  "RS",
-  "RU",
-  "RW",
-  "SA",
-  "SB",
-  "SC",
-  "SD",
-  "SE",
-  "SG",
-  "SI",
-  "SK",
-  "SL",
-  "SM",
-  "SN",
-  "SO",
-  "SR",
-  "SS",
-  "ST",
-  "SV",
-  "SY",
-  "SZ",
-  "TD",
-  "TG",
-  "TH",
-  "TJ",
-  "TL",
-  "TM",
-  "TN",
-  "TO",
-  "TR",
-  "TT",
-  "TV",
-  "TW",
-  "TZ",
-  "UA",
-  "UG",
-  "US",
-  "UY",
-  "UZ",
-  "VA",
-  "VC",
-  "VE",
-  "VG",
-  "VN",
-  "VU",
-  "WS",
-  "YE",
-  "ZA",
-  "ZM",
-  "ZW"
-]New value: +[
+  "unknown",
+  "AD",
+  "AE",
+  "AF",
+  "AG",
+  "AI",
+  "AL",
+  "AM",
+  "AO",
+  "AR",
+  "AS",
+  "AT",
+  "AU",
+  "AW",
+  "AX",
+  "AZ",
+  "BA",
+  "BB",
+  "BD",
+  "BE",
+  "BF",
+  "BG",
+  "BH",
+  "BI",
+  "BJ",
+  "BL",
+  "BM",
+  "BN",
+  "BO",
+  "BQ",
+  "BR",
+  "BS",
+  "BT",
+  "BW",
+  "BY",
+  "BZ",
+  "CA",
+  "CD",
+  "CF",
+  "CG",
+  "CH",
+  "CI",
+  "CK",
+  "CL",
+  "CM",
+  "CN",
+  "CO",
+  "CR",
+  "CU",
+  "CV",
+  "CW",
+  "CY",
+  "CZ",
+  "DE",
+  "DJ",
+  "DK",
+  "DM",
+  "DO",
+  "DZ",
+  "EC",
+  "EE",
+  "EG",
+  "EH",
+  "ER",
+  "ES",
+  "ET",
+  "FI",
+  "FJ",
+  "FK",
+  "FM",
+  "FO",
+  "FR",
+  "GA",
+  "GB",
+  "GD",
+  "GE",
+  "GF",
+  "GG",
+  "GH",
+  "GI",
+  "GL",
+  "GM",
+  "GN",
+  "GP",
+  "GQ",
+  "GR",
+  "GT",
+  "GU",
+  "GW",
+  "GY",
+  "HK",
+  "HN",
+  "HR",
+  "HT",
+  "HU",
+  "ID",
+  "IE",
+  "IL",
+  "IM",
+  "IN",
+  "IQ",
+  "IR",
+  "IS",
+  "IT",
+  "JE",
+  "JM",
+  "JO",
+  "JP",
+  "KE",
+  "KG",
+  "KH",
+  "KI",
+  "KM",
+  "KN",
+  "KP",
+  "KR",
+  "KW",
+  "KY",
+  "KZ",
+  "LA",
+  "LB",
+  "LC",
+  "LI",
+  "LK",
+  "LR",
+  "LS",
+  "LT",
+  "LU",
+  "LV",
+  "LY",
+  "MA",
+  "MC",
+  "MD",
+  "ME",
+  "MF",
+  "MG",
+  "MH",
+  "MK",
+  "ML",
+  "MM",
+  "MN",
+  "MO",
+  "MP",
+  "MQ",
+  "MR",
+  "MS",
+  "MT",
+  "MU",
+  "MV",
+  "MW",
+  "MX",
+  "MY",
+  "MZ",
+  "NA",
+  "NC",
+  "NE",
+  "NG",
+  "NI",
+  "NL",
+  "NO",
+  "NP",
+  "NR",
+  "NU",
+  "NZ",
+  "OM",
+  "PA",
+  "PE",
+  "PF",
+  "PG",
+  "PH",
+  "PK",
+  "PL",
+  "PM",
+  "PR",
+  "PS",
+  "PT",
+  "PW",
+  "PY",
+  "QA",
+  "RE",
+  "RO",
+  "RS",
+  "RU",
+  "RW",
+  "SA",
+  "SB",
+  "SC",
+  "SD",
+  "SE",
+  "SG",
+  "SH",
+  "SI",
+  "SK",
+  "SL",
+  "SM",
+  "SN",
+  "SO",
+  "SR",
+  "SS",
+  "ST",
+  "SV",
+  "SX",
+  "SY",
+  "SZ",
+  "TC",
+  "TD",
+  "TG",
+  "TH",
+  "TJ",
+  "TK",
+  "TL",
+  "TM",
+  "TN",
+  "TO",
+  "TR",
+  "TT",
+  "TV",
+  "TW",
+  "TZ",
+  "UA",
+  "UG",
+  "US",
+  "UY",
+  "UZ",
+  "VA",
+  "VC",
+  "VE",
+  "VG",
+  "VI",
+  "VN",
+  "VU",
+  "WF",
+  "WS",
+  "YE",
+  "YT",
+  "ZA",
+  "ZM",
+  "ZW"
+]

addedInput schema / properties / investsIn

Added value: +{
+  "description": "Only investors that have funded companies headquartered in these countries (OR), e.g. [\"US\"]. Filters on where an investor deploys rather than where it is registered, and is far better covered than HQ country.",
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

Changed3 schema fields changedAug 27, 2026

addedInput schema / properties / activeSince

Added value: +{
+  "description": "Only investors whose most recent round was announced on or after this date (YYYY-MM-DD).",
+  "type": "string"
+}

addedInput schema / properties / minRoundUsd

Added value: +{
+  "description": "Only investors that have participated in at least one round at or above this amount, in whole USD. Filters on behaviour rather than on a type label, which is sparse.",
+  "maximum": 9007199254740991,
+  "minimum": 0,
+  "type": "integer"
+}

addedInput schema / properties / minRounds

Added value: +{
+  "description": "Only investors that have participated in at least this many rounds.",
+  "maximum": 9007199254740991,
+  "minimum": 1,
+  "type": "integer"
+}

Changed1 schema field changedAug 26, 2026

addedInput schema / properties / countries / items / enum

Added value: +[
+  "unknown",
+  "AD",
+  "AE",
+  "AF",
+  "AG",
+  "AL",
+  "AM",
+  "AO",
+  "AR",
+  "AT",
+  "AU",
+  "AZ",
+  "BA",
+  "BB",
+  "BD",
+  "BE",
+  "BF",
+  "BG",
+  "BH",
+  "BI",
+  "BJ",
+  "BM",
+  "BN",
+  "BO",
+  "BR",
+  "BS",
+  "BT",
+  "BW",
+  "BY",
+  "BZ",
+  "CA",
+  "CD",
+  "CF",
+  "CG",
+  "CH",
+  "CI",
+  "CL",
+  "CM",
+  "CN",
+  "CO",
+  "CR",
+  "CU",
+  "CV",
+  "CY",
+  "CZ",
+  "DE",
+  "DJ",
+  "DK",
+  "DM",
+  "DO",
+  "DZ",
+  "EC",
+  "EE",
+  "EG",
+  "ER",
+  "ES",
+  "ET",
+  "FI",
+  "FJ",
+  "FM",
+  "FR",
+  "GA",
+  "GB",
+  "GD",
+  "GE",
+  "GG",
+  "GH",
+  "GI",
+  "GM",
+  "GN",
+  "GQ",
+  "GR",
+  "GT",
+  "GW",
+  "GY",
+  "HK",
+  "HN",
+  "HR",
+  "HT",
+  "HU",
+  "ID",
+  "IE",
+  "IL",
+  "IM",
+  "IN",
+  "IQ",
+  "IR",
+  "IS",
+  "IT",
+  "JE",
+  "JM",
+  "JO",
+  "JP",
+  "KE",
+  "KG",
+  "KH",
+  "KI",
+  "KM",
+  "KN",
+  "KP",
+  "KR",
+  "KW",
+  "KY",
+  "KZ",
+  "LA",
+  "LB",
+  "LC",
+  "LI",
+  "LK",
+  "LR",
+  "LS",
+  "LT",
+  "LU",
+  "LV",
+  "LY",
+  "MA",
+  "MC",
+  "MD",
+  "ME",
+  "MG",
+  "MH",
+  "MK",
+  "ML",
+  "MM",
+  "MN",
+  "MO",
+  "MR",
+  "MT",
+  "MU",
+  "MV",
+  "MW",
+  "MX",
+  "MY",
+  "MZ",
+  "NA",
+  "NE",
+  "NG",
+  "NI",
+  "NL",
+  "NO",
+  "NP",
+  "NR",
+  "NZ",
+  "OM",
+  "PA",
+  "PG",
+  "PH",
+  "PK",
+  "PL",
+  "PR",
+  "PS",
+  "PT",
+  "PW",
+  "PY",
+  "QA",
+  "RO",
+  "RS",
+  "RU",
+  "RW",
+  "SA",
+  "SB",
+  "SC",
+  "SD",
+  "SE",
+  "SG",
+  "SI",
+  "SK",
+  "SL",
+  "SM",
+  "SN",
+  "SO",
+  "SR",
+  "SS",
+  "ST",
+  "SV",
+  "SY",
+  "SZ",
+  "TD",
+  "TG",
+  "TH",
+  "TJ",
+  "TL",
+  "TM",
+  "TN",
+  "TO",
+  "TR",
+  "TT",
+  "TV",
+  "TW",
+  "TZ",
+  "UA",
+  "UG",
+  "US",
+  "UY",
+  "UZ",
+  "VA",
+  "VC",
+  "VE",
+  "VG",
+  "VN",
+  "VU",
+  "WS",
+  "YE",
+  "ZA",
+  "ZM",
+  "ZW"
+]

Changed3 schema fields changedAug 26, 2026

addedInput schema / properties / countries

Added value: +{
+  "description": "Headquarters country codes (ISO alpha-2, OR). Pass \"unknown\" to include companies with no country on file.",
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

removedInput schema / properties / country

Removed value: -{
-  "description": "Headquarters country code (ISO alpha-2).",
-  "type": "string"
-}

addedInput schema / properties / hasFirmographics

Added value: +{
+  "description": "Only investors whose domain and type we have resolved.",
+  "type": "boolean"
+}

Changed1 schema field changedJul 4, 2026

changedInput schema / properties / since / description

Previous value: -"Return investors created/updated after this ISO-8601 timestamp."New value: +"Return investors created/updated on or after this date (YYYY-MM-DD) or ISO-8601 timestamp."

First observedJun 28, 2026

TDQS

A3.7/5.0

Behavior4/5

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

Annotations already declare readOnly/openWorld/non-destructive, so the safety profile is covered. The description adds material context they don't: "Costs one credit per returned record," which directly affects how an agent should set limit. It stops short of describing pagination or result shape.

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?

Two sentences, zero filler, with the capability statement front-loaded and the cost caveat immediately after it. Nothing here is redundant or padded.

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

Completeness3/5

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

With 13 optional parameters the description is thin — it omits pagination (cursor/limit interplay) and the pricing-relevant includeTotal flag, both of which the schema documents but that an agent benefits from seeing surfaced. It is adequate because the schema and annotations carry the rest, but not complete for a tool of this breadth.

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?

Schema coverage is 100%, so every parameter, including the country enum and the investsIn/minRounds behavioural filters, is documented in-schema. The description repeats four of the thirteen filters (keyword, type, HQ country, domain) without adding format or interaction semantics, so it is baseline rather than value-adding.

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?

Specific verb and resource: "Search and filter investor records" with the filter axes named (keyword, type, HQ country, domain). It is clearly a different resource than sibling tools like companies or funding_events, but it never explicitly names an alternative or boundary against them.

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

Usage Guidelines3/5

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

Usage is only implied by the resource name — an agent knows this is the tool for finding investors. There is no guidance on when to prefer it over companies or funding_events, nor on combining filters. The one explicit usage-relevant fact is the per-record credit cost.

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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