CalderFlow

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Make editable flowcharts, process charts, funnels, timelines and data models from plain language.

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      "updatedAt": "2026-11-15T04:14:39.146748Z",
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        "headers": [
          {
            "name": "X-API-Key",
            "isSecret": true,
            "isRequired": true,
            "description": "Your CalderFlow key (cfk_...). Sign in free at calderflow.com, then open the chart menu and choose Copy MCP URL."
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    "version": "1.0.0",
    "websiteUrl": "https://www.calderflow.com",
    "description": "Make editable flowcharts, process charts, funnels, timelines and data models from plain language."
  }
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Try it

Call this server's tools from your browser. Nothing to install.

https://www.calderflow.com/mcp

X-API-Key (required)

Your CalderFlow key (cfk_...). Sign in free at calderflow.com, then open the chart menu and choose Copy MCP URL.

Requests go through mcptry because browsers can't call most MCP servers directly. Header values are sent to the server for that request only and are never stored or logged.

Tool list from our last check. Connect live to refresh it.

create_chevron_chart

Create a sequential/chevron chart: a linear sequence of steps, phases, or stages (e.g. onboarding steps, project phases). NOT for branching logic — use create_flowchart for that. Include a 1-2 sentence description per step to make it presentation-ready. Aim for 4-6 steps: Presentation is one slide of at most 6. For a longer process, follow up with edit_chart set_presentation_steps choosing the 4-6 most important step IDs.

stepsarray, required

Ordered list of steps. 3-7 is ideal.

titlestring, required

Chart title shown in the app and share page.

This tool isn't marked read-only, so it may change something on the server or in an account you connected.

I understand, run it anyway

Try it

Call this server's tools from your browser. Nothing to install.

https://www.calderflow.com/mcp

X-API-Key (required)

Your CalderFlow key (cfk_...). Sign in free at calderflow.com, then open the chart menu and choose Copy MCP URL.

Requests go through mcptry because browsers can't call most MCP servers directly. Header values are sent to the server for that request only and are never stored or logged.

Tool list from our last check. Connect live to refresh it.

create_chevron_chart

stepsarray, required

Ordered list of steps. 3-7 is ideal.

titlestring, required

Chart title shown in the app and share page.

This tool isn't marked read-only, so it may change something on the server or in an account you connected.

I understand, run it anyway

Tools (10)

create_chevron_chart

Argument	Type	Description
steps*	array	Ordered list of steps. 3-7 is ideal.
title*	string	Chart title shown in the app and share page.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "title",
    "steps"
  ],
  "properties": {
    "steps": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "label"
        ],
        "properties": {
          "id": {
            "type": "string",
            "description": "Short unique ID (lowercase, underscores). Optional."
          },
          "key": {
            "type": "boolean",
            "description": "true on the single item the audience should remember (one per chart, 4+ items)."
          },
          "icon": {
            "enum": [
              "user",
              "users",
              "user-plus",
              "user-check",
              "log-in",
              "log-out",
              "lock",
              "unlock",
              "key",
              "shield-check",
              "fingerprint",
              "mail",
              "send",
              "message-square",
              "bell",
              "phone",
              "building-2",
              "briefcase",
              "landmark",
              "store",
              "credit-card",
              "wallet",
              "receipt",
              "dollar-sign",
              "shopping-cart",
              "package",
              "truck",
              "gift",
              "check-circle",
              "x-circle",
              "alert-triangle",
              "info",
              "help-circle",
              "ban",
              "clock",
              "calendar",
              "timer",
              "hourglass",
              "file-text",
              "clipboard-check",
              "file-signature",
              "book-open",
              "folder",
              "database",
              "server",
              "cloud",
              "code",
              "git-branch",
              "git-merge",
              "terminal",
              "cpu",
              "bug",
              "settings",
              "sliders-horizontal",
              "search",
              "filter",
              "eye",
              "upload",
              "download",
              "refresh-cw",
              "repeat",
              "link",
              "share-2",
              "rocket",
              "flag",
              "target",
              "trophy",
              "star",
              "thumbs-up",
              "heart",
              "sparkles",
              "zap",
              "bar-chart-3",
              "trending-up",
              "trending-down",
              "pie-chart",
              "activity",
              "layout-dashboard",
              "home",
              "globe",
              "map-pin",
              "smartphone",
              "monitor",
              "list-checks",
              "layers",
              "inbox",
              "archive",
              "handshake",
              "lightbulb",
              "megaphone",
              "graduation-cap"
            ],
            "type": "string",
            "description": "Icon shown beside this item in Polished Presentation."
          },
          "label": {
            "type": "string",
            "description": "Short step name (1-4 words). Supports markdown."
          },
          "description": {
            "type": "string",
            "description": "1-2 sentence description. Supports markdown. Put \\n before and after structured labels such as **Goal:**, **KPI:**, and *Success signals:* so each label occupies its own line."
          }
        }
      },
      "description": "Ordered list of steps. 3-7 is ideal."
    },
    "title": {
      "type": "string",
      "description": "Chart title shown in the app and share page."
    }
  }
}

create_erd_chart

Create an entity-relationship diagram (database schema / data model) with typed fields, PK/FK markers, and crow's-foot relationships. Entity names UPPER_SNAKE_CASE, 3-8 focused fields each.

Argument	Type	Description
title*	string	Chart title shown in the app and share page.
entities*	array	Entities (tables). 2-8 is ideal.
relationships	array	Relationships with cardinality.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "title",
    "entities"
  ],
  "properties": {
    "title": {
      "type": "string",
      "description": "Chart title shown in the app and share page."
    },
    "entities": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "name"
        ],
        "properties": {
          "name": {
            "type": "string",
            "description": "Entity name, e.g. 'CUSTOMER'. Letters/digits/underscores only."
          },
          "attributes": {
            "type": "array",
            "items": {
              "type": "object",
              "required": [
                "type",
                "name"
              ],
              "properties": {
                "key": {
                  "type": "string",
                  "description": "'PK', 'FK', 'UK', or comma list. Omit for plain fields."
                },
                "name": {
                  "type": "string",
                  "description": "Field name, e.g. 'customer_id'."
                },
                "type": {
                  "type": "string",
                  "description": "e.g. 'string', 'int', 'date', 'decimal', 'bool'."
                },
                "comment": {
                  "type": "string",
                  "description": "Optional short note."
                }
              }
            },
            "description": "Typed fields, keys first."
          }
        }
      },
      "description": "Entities (tables). 2-8 is ideal."
    },
    "relationships": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "from",
          "to",
          "cardinality"
        ],
        "properties": {
          "to": {
            "type": "string",
            "description": "Target entity name."
          },
          "from": {
            "type": "string",
            "description": "Source entity name."
          },
          "label": {
            "type": "string",
            "description": "Verb phrase, e.g. 'places', 'contains'."
          },
          "cardinality": {
            "enum": [
              "one-to-one",
              "one-to-many",
              "many-to-one",
              "many-to-many"
            ],
            "type": "string"
          }
        }
      },
      "description": "Relationships with cardinality."
    }
  }
}

create_flowchart

Create a presentation-ready flowchart or architecture diagram from Mermaid source. Use for branching processes, decision trees, and system architecture. Rules: start with 'flowchart TD' or 'flowchart LR'; solid arrows only (-->, optionally with |labels|); node shapes: A[Process] B{Decision} C([Start/End]). CalderFlow presents decisions as compact amber cards and terminals as green states, so use shapes semantically and do not add decorative classDef noise. CALIBRATE DETAIL: vague/ideation ask → 4-7 nodes, happy path + at most 2 essential decisions, NO subgraphs; detailed/spec-driven ask → subgraphs as phases, <=7 nodes per subgraph, <=18 nodes total (split the story into an overview plus detail chart beyond that). Consolidate checks that lead to the same outcome. If any subgraph is used, EVERY node—including starts, errors, and final outcomes—must be declared inside exactly one subgraph. Put internal edges inside their subgraph and cross-phase edges outside. Node labels 1-4 words; label every decision branch. Connect phases that hand off to each other. Returns the chart id + share URL. Give every node an icon with a %% nodeIcon <nodeId> <icon> line and mark the one step to remember with class <nodeId> keyStep (see the server instructions for icon names).

Argument	Type	Description
title*	string	Chart title shown in the app and share page.
mermaid*	string	Mermaid flowchart source code.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "title",
    "mermaid"
  ],
  "properties": {
    "title": {
      "type": "string",
      "description": "Chart title shown in the app and share page."
    },
    "mermaid": {
      "type": "string",
      "description": "Mermaid flowchart source code."
    }
  }
}

create_funnel_chart

Create a funnel chart for filtering/narrowing processes where quantities reduce per stage (conversion funnels, pipelines). Include stage values when numbers are available; set conversionRates for proportional widths.

Argument	Type	Description
title*	string	Chart title shown in the app and share page.
stages*	array	Ordered stages from widest (top) to narrowest (bottom). 3-6 is ideal.
conversionRates	array	Conversion percentages between adjacent stages (length = stages - 1), e.g. [75, 50, 30].

Input schema (JSON)

{
  "type": "object",
  "required": [
    "title",
    "stages"
  ],
  "properties": {
    "title": {
      "type": "string",
      "description": "Chart title shown in the app and share page."
    },
    "stages": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "label"
        ],
        "properties": {
          "id": {
            "type": "string",
            "description": "Short unique ID. Optional."
          },
          "key": {
            "type": "boolean",
            "description": "true on the single item the audience should remember (one per chart, 4+ items)."
          },
          "icon": {
            "enum": [
              "user",
              "users",
              "user-plus",
              "user-check",
              "log-in",
              "log-out",
              "lock",
              "unlock",
              "key",
              "shield-check",
              "fingerprint",
              "mail",
              "send",
              "message-square",
              "bell",
              "phone",
              "building-2",
              "briefcase",
              "landmark",
              "store",
              "credit-card",
              "wallet",
              "receipt",
              "dollar-sign",
              "shopping-cart",
              "package",
              "truck",
              "gift",
              "check-circle",
              "x-circle",
              "alert-triangle",
              "info",
              "help-circle",
              "ban",
              "clock",
              "calendar",
              "timer",
              "hourglass",
              "file-text",
              "clipboard-check",
              "file-signature",
              "book-open",
              "folder",
              "database",
              "server",
              "cloud",
              "code",
              "git-branch",
              "git-merge",
              "terminal",
              "cpu",
              "bug",
              "settings",
              "sliders-horizontal",
              "search",
              "filter",
              "eye",
              "upload",
              "download",
              "refresh-cw",
              "repeat",
              "link",
              "share-2",
              "rocket",
              "flag",
              "target",
              "trophy",
              "star",
              "thumbs-up",
              "heart",
              "sparkles",
              "zap",
              "bar-chart-3",
              "trending-up",
              "trending-down",
              "pie-chart",
              "activity",
              "layout-dashboard",
              "home",
              "globe",
              "map-pin",
              "smartphone",
              "monitor",
              "list-checks",
              "layers",
              "inbox",
              "archive",
              "handshake",
              "lightbulb",
              "megaphone",
              "graduation-cap"
            ],
            "type": "string",
            "description": "Icon shown beside this item in Polished Presentation."
          },
          "label": {
            "type": "string",
            "description": "Stage name (1-4 words). Supports markdown."
          },
          "value": {
            "type": "string",
            "description": "Metric shown below the label, e.g. '1,000 leads', '25%'."
          },
          "description": {
            "type": "string",
            "description": "1-2 sentence description shown beside the stage."
          }
        }
      },
      "description": "Ordered stages from widest (top) to narrowest (bottom). 3-6 is ideal."
    },
    "conversionRates": {
      "type": "array",
      "items": {
        "type": "number"
      },
      "description": "Conversion percentages between adjacent stages (length = stages - 1), e.g. [75, 50, 30]."
    }
  }
}

create_lifecycle_chart

Create a lifecycle chart: phases across the top and milestones plotted on a curve. Each milestone has a level 1-10 setting its height — bell curves, S-curves, dips all emerge from levels. Use for product lifecycles, customer journeys, adoption/maturity curves. Every milestone needs a phaseId.

Argument	Type	Description
title*	string	Chart title shown in the app and share page.
phases*	array	2-5 phases shown as headers.
timeLabel	string	X-axis label (e.g. 'Time').
curveLabel	string	Y-axis label (e.g. 'Value', 'Adoption').
milestones*	array	4-8 milestones on the curve.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "title",
    "phases",
    "milestones"
  ],
  "properties": {
    "title": {
      "type": "string",
      "description": "Chart title shown in the app and share page."
    },
    "phases": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "label"
        ],
        "properties": {
          "id": {
            "type": "string",
            "description": "Short unique ID."
          },
          "label": {
            "type": "string",
            "description": "Phase name (1-3 words)."
          }
        }
      },
      "description": "2-5 phases shown as headers."
    },
    "timeLabel": {
      "type": "string",
      "description": "X-axis label (e.g. 'Time')."
    },
    "curveLabel": {
      "type": "string",
      "description": "Y-axis label (e.g. 'Value', 'Adoption')."
    },
    "milestones": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "label",
          "level",
          "phaseId"
        ],
        "properties": {
          "id": {
            "type": "string",
            "description": "Short unique ID."
          },
          "key": {
            "type": "boolean",
            "description": "true on the single item the audience should remember (one per chart, 4+ items)."
          },
          "icon": {
            "enum": [
              "user",
              "users",
              "user-plus",
              "user-check",
              "log-in",
              "log-out",
              "lock",
              "unlock",
              "key",
              "shield-check",
              "fingerprint",
              "mail",
              "send",
              "message-square",
              "bell",
              "phone",
              "building-2",
              "briefcase",
              "landmark",
              "store",
              "credit-card",
              "wallet",
              "receipt",
              "dollar-sign",
              "shopping-cart",
              "package",
              "truck",
              "gift",
              "check-circle",
              "x-circle",
              "alert-triangle",
              "info",
              "help-circle",
              "ban",
              "clock",
              "calendar",
              "timer",
              "hourglass",
              "file-text",
              "clipboard-check",
              "file-signature",
              "book-open",
              "folder",
              "database",
              "server",
              "cloud",
              "code",
              "git-branch",
              "git-merge",
              "terminal",
              "cpu",
              "bug",
              "settings",
              "sliders-horizontal",
              "search",
              "filter",
              "eye",
              "upload",
              "download",
              "refresh-cw",
              "repeat",
              "link",
              "share-2",
              "rocket",
              "flag",
              "target",
              "trophy",
              "star",
              "thumbs-up",
              "heart",
              "sparkles",
              "zap",
              "bar-chart-3",
              "trending-up",
              "trending-down",
              "pie-chart",
              "activity",
              "layout-dashboard",
              "home",
              "globe",
              "map-pin",
              "smartphone",
              "monitor",
              "list-checks",
              "layers",
              "inbox",
              "archive",
              "handshake",
              "lightbulb",
              "megaphone",
              "graduation-cap"
            ],
            "type": "string",
            "description": "Icon shown beside this item in Polished Presentation."
          },
          "label": {
            "type": "string",
            "description": "Milestone name (1-4 words)."
          },
          "level": {
            "type": "number",
            "description": "1 (low) to 10 (high) — curve height at this point. Unless the user gives values, span most of the range and step at least 2 levels between neighbours so the shape is visible."
          },
          "phaseId": {
            "type": "string",
            "description": "ID of the phase this milestone belongs to."
          },
          "description": {
            "type": "string",
            "description": "Optional brief description (5-10 words)."
          }
        }
      },
      "description": "4-8 milestones on the curve."
    }
  }
}

create_timeline_chart

Create a timeline of events in chronological order (roadmaps, company history, sprint/release schedules). Every event needs a marker: supplied dates, relative time for a proposed plan, or Phase 1, Phase 2, etc. for an undated process. Never invent factual dates or measured durations. Include concise descriptions; group related events into eras.

Argument	Type	Description
eras	array	Optional named periods grouping events (background bands).
title*	string	Chart title shown in the app and share page.
events*	array	Chronological events. 4-10 is ideal.
direction	string	Layout direction; horizontal is default.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "title",
    "events"
  ],
  "properties": {
    "eras": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "label"
        ],
        "properties": {
          "id": {
            "type": "string",
            "description": "Short unique ID."
          },
          "label": {
            "type": "string",
            "description": "Era name (1-3 words)."
          }
        }
      },
      "description": "Optional named periods grouping events (background bands)."
    },
    "title": {
      "type": "string",
      "description": "Chart title shown in the app and share page."
    },
    "events": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "label",
          "date"
        ],
        "properties": {
          "id": {
            "type": "string",
            "description": "Short unique ID. Optional."
          },
          "key": {
            "type": "boolean",
            "description": "true on the single item the audience should remember (one per chart, 4+ items)."
          },
          "date": {
            "type": "string",
            "minLength": 1,
            "description": "Required timeline marker including units: 'Jan 15, 2027', 'Week 1', 'Second 5', or 'Phase 1'. Shared units are auto-extracted. Preserve supplied dates; disclose proposed relative timing as estimated; use ordinal phases for undated processes or TBD for unknown dates in an otherwise dated chart. Never fabricate factual dates/durations."
          },
          "icon": {
            "enum": [
              "user",
              "users",
              "user-plus",
              "user-check",
              "log-in",
              "log-out",
              "lock",
              "unlock",
              "key",
              "shield-check",
              "fingerprint",
              "mail",
              "send",
              "message-square",
              "bell",
              "phone",
              "building-2",
              "briefcase",
              "landmark",
              "store",
              "credit-card",
              "wallet",
              "receipt",
              "dollar-sign",
              "shopping-cart",
              "package",
              "truck",
              "gift",
              "check-circle",
              "x-circle",
              "alert-triangle",
              "info",
              "help-circle",
              "ban",
              "clock",
              "calendar",
              "timer",
              "hourglass",
              "file-text",
              "clipboard-check",
              "file-signature",
              "book-open",
              "folder",
              "database",
              "server",
              "cloud",
              "code",
              "git-branch",
              "git-merge",
              "terminal",
              "cpu",
              "bug",
              "settings",
              "sliders-horizontal",
              "search",
              "filter",
              "eye",
              "upload",
              "download",
              "refresh-cw",
              "repeat",
              "link",
              "share-2",
              "rocket",
              "flag",
              "target",
              "trophy",
              "star",
              "thumbs-up",
              "heart",
              "sparkles",
              "zap",
              "bar-chart-3",
              "trending-up",
              "trending-down",
              "pie-chart",
              "activity",
              "layout-dashboard",
              "home",
              "globe",
              "map-pin",
              "smartphone",
              "monitor",
              "list-checks",
              "layers",
              "inbox",
              "archive",
              "handshake",
              "lightbulb",
              "megaphone",
              "graduation-cap"
            ],
            "type": "string",
            "description": "Icon shown beside this item in Polished Presentation."
          },
          "eraId": {
            "type": "string",
            "description": "Optional era this event belongs to."
          },
          "label": {
            "type": "string",
            "description": "Event name (1-5 words)."
          },
          "description": {
            "type": "string",
            "description": "Brief 1-sentence description."
          }
        }
      },
      "description": "Chronological events. 4-10 is ideal."
    },
    "direction": {
      "enum": [
        "horizontal",
        "vertical"
      ],
      "type": "string",
      "description": "Layout direction; horizontal is default."
    }
  }
}

delete_chart

Permanently delete a chart you own.

Argument	Type	Description
chart_id*	string

Input schema (JSON)

{
  "type": "object",
  "required": [
    "chart_id"
  ],
  "properties": {
    "chart_id": {
      "type": "string"
    }
  }
}

edit_chart

Edit an existing chart. Call get_chart first to see its current spec, then pass tool_calls (surgical edits) and/or mermaid (full source replacement, flowchart/ERD only). A create_* tool call replaces the chart's data wholesale and can switch its type. Valid tool names — flowchart: style_chart, update_node, delete_node, add_node, connect_nodes, delete_edge, organize_sections, add_section, update_section, delete_section, move_node_to_section, set_node_icon ({nodeId, icon} or icon "none" to remove), set_key_step ({nodeId} or "none"); process/funnel/timeline/lifecycle: set_item_icon ({itemId, icon} or icon "none") and set_key_item ({itemId} or "none"), plus icon on add_* calls; any type: set_slide_text ({headline, takeaway}) for the Designed presentation slide and set_walkthrough ({steps:[{id, caption}]}) for the Walkthrough (a flowchart with 2+ sections walks one step per section, using subgraph IDs; otherwise use node or item IDs); chevron: create_chevron_chart, add_step, update_step, delete_step, reorder_steps, set_presentation_steps, style_chevron_chart; funnel: create_funnel_chart, add_funnel_stage, update_funnel_stage, delete_funnel_stage, reorder_funnel_stages, style_funnel_chart; lifecycle: create_lifecycle_chart, add_lifecycle_milestone, update_lifecycle_milestone, delete_lifecycle_milestone, update_lifecycle_phase, style_lifecycle_chart; timeline: create_timeline_chart, add_timeline_event, update_timeline_event, delete_timeline_event, reorder_timeline_events, style_timeline_chart; erd: create_erd_chart, add_erd_entity, update_erd_entity, delete_erd_entity, add_erd_attribute, update_erd_attribute, delete_erd_attribute, add_erd_relationship, update_erd_relationship, delete_erd_relationship, set_erd_direction, style_erd_chart (set_erd_direction takes {direction: "vertical"|"horizontal"}). For chevron Presentation-only selection/order edits, use set_presentation_steps with {stepIds:[up to 6 existing IDs in featured order]} (or null to reset to all); never reorder_steps, delete_step, or rename Full steps to change a Presentation summary. Use organize_sections with {sections:[{sectionId,title,nodeIds}], ungroupedNodeIds?} for a complete multi-section regroup; omitted nodes are placed with their closest connected section. Input shapes otherwise match the get_chart spec data (e.g. add_node takes {nodeId, label, shape?, connectFrom?, connectTo?}; style_chart takes {target: '<nodeId>'|'all', bgColor?, textColor?, borderColor?}).

Argument	Type

get_chart

Fetch a chart's current spec (JSON) and editable source text, plus its share URL.

Argument	Type	Description
chart_id*	string

Input schema (JSON)

{
  "type": "object",
  "required": [
    "chart_id"
  ],
  "properties": {
    "chart_id": {
      "type": "string"
    }
  }
}

list_charts

List your CalderFlow charts (id, title, type, share URL), newest first.

No arguments.

Input schema (JSON)

{
  "type": "object",
  "properties": {}
}

CalderFlow

Registry entry

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create_chevron_chart

CalderFlow

Registry entry

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create_chevron_chart

Install

Tools (10)

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title	string	New title (optional).
mermaid	string	Full replacement mermaid source (flowchart/ERD charts only).
chart_id*	string	Chart id from create_* / list_charts.
tool_calls	array	Ordered edit operations: [{tool, input}].