What Led To

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Living, source-backed timelines of long-running events, with a quote and source per entry.

Research & Knowledge

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https://whatledto.com/mcp

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ask

Answer a why/how question as a chain: an ordered set of dated, sourced entries from the timelines with one line on why each led to the next, written by the editor rather than generated. Returns the best-matching chain with every step's entry (URL, date, summary, sources), or, when no chain fits, the questions that do exist and how to research the answer with the other tools.

questionstring, required

The question in plain words, e.g. "Why did Nvidia become so dominant in AI?"

sincestring

Also return what changed on the chain since this day (its changelog entries after it); pass the updated_at you last saw.

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Tools (7)

ask

Argument	Type	Description
since	string	Also return what changed on the chain since this day (its changelog entries after it); pass the updated_at you last saw.
question*	string	The question in plain words, e.g. "Why did Nvidia become so dominant in AI?"

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "question"
  ],
  "properties": {
    "since": {
      "type": "string",
      "pattern": "^\\d{4}(-\\d{2}(-\\d{2})?)?$",
      "description": "Also return what changed on the chain since this day (its changelog entries after it); pass the updated_at you last saw."
    },
    "question": {
      "type": "string",
      "maxLength": 300,
      "minLength": 3,
      "description": "The question in plain words, e.g. \"Why did Nvidia become so dominant in AI?\""
    }
  },
  "additionalProperties": false
}

get_entry

One dated entry in full: its summary, type, the parties it names, every source with the outlet, the publication date and the verbatim quote it was read from, plus the relations and cross-timeline links it takes part in. Use it after search_entries or get_timeline has found an entry and you need the exact wording and source URL to cite. Entry ids are unique within a timeline, not across the site, so pass the slug the entry came from.

Argument	Type	Description
id*	integer	The entry's id on that timeline: the id field of a search_entries result or a get_timeline node, and the number in a page's #n<id> fragment.
slug*	string	The timeline the entry sits on.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "slug",
    "id"
  ],
  "properties": {
    "id": {
      "type": "integer",
      "description": "The entry's id on that timeline: the id field of a search_entries result or a get_timeline node, and the number in a page's #n<id> fragment."
    },
    "slug": {
      "type": "string",
      "pattern": "^[a-z0-9-]+$",
      "description": "The timeline the entry sits on."
    }
  },
  "additionalProperties": false
}

get_party

Everything the site records about one company, person or regulator across every timeline: its role on each, the parties it most often appears alongside, and every dated entry that names it, newest first, with sources. Use it instead of search_entries when you want one actor's whole history rather than a keyword match. Returns at most limit entries, with total_entries saying how many exist; a party is named when the editors listed it among an entry's parties, not merely when the name appears in the text.

Argument	Type	Description
id*	string	Party id: a lowercase slug such as nvidia, jensen-huang or federal-reserve. search_entries results and timeline entities carry it, and the parties that have a page are listed under parties in /index.json.
limit	integer	Entries to return, newest first (default 40).

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "pattern": "^[a-z0-9-]+$",
      "description": "Party id: a lowercase slug such as nvidia, jensen-huang or federal-reserve. search_entries results and timeline entities carry it, and the parties that have a page are listed under parties in /index.json."
    },
    "limit": {
      "type": "integer",
      "maximum": 200,
      "minimum": 1,
      "description": "Entries to return, newest first (default 40)."
    }
  },
  "additionalProperties": false
}

get_timeline

One timeline in full: TL;DR, dated entries newest first with sources and quotes, relations between entries, links to other timelines, what to watch next and open questions. Pass since=YYYY-MM-DD to get only entries dated on or after that day (what changed recently).

Argument	Type	Description
slug*	string	Timeline slug, from list_timelines or a page URL (/events/<slug>).
limit	integer	Most recent entries to return (default 60).
since	string	Only entries dated on or after this day. Pass the updated_at you last saw to get what changed since.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "slug"
  ],
  "properties": {
    "slug": {
      "type": "string",
      "pattern": "^[a-z0-9-]+$",
      "description": "Timeline slug, from list_timelines or a page URL (/events/<slug>)."
    },
    "limit": {
      "type": "integer",
      "maximum": 200,
      "minimum": 1,
      "description": "Most recent entries to return (default 60)."
    },
    "since": {
      "type": "string",
      "pattern": "^\\d{4}(-\\d{2}(-\\d{2})?)?$",
      "description": "Only entries dated on or after this day. Pass the updated_at you last saw to get what changed since."
    }
  },
  "additionalProperties": false
}

list_timelines

Every timeline on the site with its topic, tags, entry count, date range, last update and a short summary. Start here to find the slug for get_timeline.

No arguments.

Input schema (JSON)

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

search_entries

Find dated entries across every timeline by keywords, party id, timeline slug and date range. Every keyword must match (title, summary, party or timeline name); results are ranked, newest first among equals. Returns the entry text and url; call get_entry for quotes and sources.

Argument	Type	Description
to	any	Latest entry date to include.
from	string	Earliest entry date to include.
limit	integer	Results to return (default 20); total says how many matched.
party	string	Only entries naming this party id.
query	string	Keywords. Every one must match, in the entry's title, summary, a party name or the timeline name; omit it to browse by filter alone.
timeline	any	Only entries on this timeline slug.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "to": {
      "$ref": "#/properties/from",
      "description": "Latest entry date to include."
    },
    "from": {
      "type": "string",
      "pattern": "^\\d{4}(-\\d{2}(-\\d{2})?)?$",
      "description": "Earliest entry date to include."
    },
    "limit": {
      "type": "integer",
      "maximum": 100,
      "minimum": 1,
      "description": "Results to return (default 20); total says how many matched."
    },
    "party": {
      "type": "string",
      "pattern": "^[a-z0-9-]+$",
      "description": "Only entries naming this party id."
    },
    "query": {
      "type": "string",
      "maxLength": 200,
      "description": "Keywords. Every one must match, in the entry's title, summary, a party name or the timeline name; omit it to browse by filter alone."
    },
    "timeline": {
      "$ref": "#/properties/party",
      "description": "Only entries on this timeline slug."
    }
  },
  "additionalProperties": false
}

upcoming

Scheduled dates the timelines are watching — earnings, rulings, launches, rule deadlines — each with why it matters, the timeline it belongs to and a source where one exists. Use it to answer what happens next across the site, rather than reading each timeline for its own catalysts. Returns the dates from today to the horizon, oldest first, echoing back today and horizon; a date known only to the month carries precision=month and is matched on the month.

Argument	Type	Description
days	integer	How far ahead to look, in days from today (default 90).
timeline	string	Only dates belonging to this timeline slug.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "days": {
      "type": "integer",
      "maximum": 730,
      "minimum": 1,
      "description": "How far ahead to look, in days from today (default 90)."
    },
    "timeline": {
      "type": "string",
      "pattern": "^[a-z0-9-]+$",
      "description": "Only dates belonging to this timeline slug."
    }
  },
  "additionalProperties": false
}