> ## Documentation Index
> Fetch the complete documentation index at: https://docs.doers.sh/llms.txt
> Use this file to discover all available pages before exploring further.

# Complete a habit for a day

> Records the occurrence, with what was done for a measured target. Doing it again for the same day updates the one record rather than adding a second. Refused on a day the habit is not due, and on an archived habit.



## OpenAPI

````yaml https://api.doers.sh/openapi.json put /v2/habits/{habitId}/completions/{day}
openapi: 3.1.0
info:
  title: Doers API
  version: 2.0.0
  description: >-
    The open API of Doers: tasks, projects, areas, prioritised context and the
    day's plan.


    ## Authentication


    Every route requires a bearer token, generated from **Settings > API & MCP**
    in the app:


    ```

    Authorization: Bearer pc_…

    ```


    ## Two date fields, not to be confused


    - `when` — the **schedule**: `today`, `anytime` (Later), `someday` (Future)
    or a date.

    - `deadline` — the **commitment**, independent of the schedule.


    ## Time zone


    The server reasons in UTC and does not know yours. Send the `X-PC-Today:
    YYYY-MM-DD` header

    (or the `day` argument where it exists) so dated operations use your local
    day.


    ## MCP server


    The same token gives access to the [Model Context
    Protocol](https://modelcontextprotocol.io)

    server at `POST https://doers.sh/mcp`, which exposes the same operations as
    tools for Claude,

    Cursor and other compatible clients.
servers:
  - url: https://api.doers.sh
    description: Production.
security:
  - bearerAuth: []
tags:
  - name: Tasks
  - name: Projects
  - name: Areas
  - name: Headings
  - name: Comments
  - name: Realtime
  - name: Devices
  - name: Context
  - name: Plan
  - name: Sessions
  - name: Rounds
  - name: Journal
  - name: Habits
  - name: Stats
  - name: Users
  - name: Profiles
  - name: Workspaces
  - name: Access
  - name: Activity
  - name: Tokens
  - name: Referrals
  - name: Files
  - name: Connections
  - name: Collaborators
  - name: Links
  - name: Packages
  - name: Installs
  - name: Billing
  - name: Calendar
  - name: Coach
  - name: Marketplace
paths:
  /v2/habits/{habitId}/completions/{day}:
    put:
      tags:
        - Habits
      summary: Complete a habit for a day
      description: >-
        Records the occurrence, with what was done for a measured target. Doing
        it again for the same day updates the one record rather than adding a
        second. Refused on a day the habit is not due, and on an archived habit.
      operationId: completeHabit
      parameters:
        - name: day
          in: path
          required: true
          description: Local day key, `YYYY-MM-DD`.
          schema:
            type: string
            format: date
            pattern: >-
              ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))$
        - name: habitId
          in: path
          required: true
          schema:
            type: string
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              properties:
                amount:
                  type: integer
                  minimum: 0
                  maximum: 100000
                minutes:
                  type: integer
                  minimum: 0
                  maximum: 1440
              additionalProperties: false
      responses:
        '200':
          description: Success.
          content:
            application/json:
              schema:
                type: object
                properties:
                  completion:
                    type: object
                    properties:
                      id:
                        type: string
                      habitId:
                        type: string
                      day:
                        type: string
                        format: date
                        pattern: >-
                          ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))$
                        description: Local day key, `YYYY-MM-DD`.
                      amount:
                        anyOf:
                          - type: integer
                            minimum: 0
                            maximum: 9007199254740991
                          - type: 'null'
                        description: What was done, for a quantity target.
                      minutes:
                        anyOf:
                          - type: integer
                            minimum: 0
                            maximum: 9007199254740991
                          - type: 'null'
                        description: What was done, for a minutes target.
                      completedAt:
                        type: number
                        description: Epoch milliseconds.
                    required:
                      - id
                      - habitId
                      - day
                      - amount
                      - minutes
                      - completedAt
                    additionalProperties: false
                required:
                  - completion
                additionalProperties: false
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
        '409':
          $ref: '#/components/responses/Conflict'
        '429':
          $ref: '#/components/responses/TooManyRequests'
components:
  responses:
    BadRequest:
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
      description: >-
        Invalid request — unreadable body, out-of-range field or unknown
        parameter.
    Unauthorized:
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
      description: Token missing, unknown or revoked.
    NotFound:
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
      description: >-
        Resource does not exist **or** belongs to another account — the API
        never distinguishes the two.
    Conflict:
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
      description: Conflicts with the resource's current state.
    TooManyRequests:
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
      description: Too many requests. `Retry-After` says how many seconds to wait.
  schemas:
    Error:
      type: object
      properties:
        error:
          type: object
          properties:
            code:
              type: string
              description: Stable machine-readable code.
            message:
              type: string
              description: Human-readable message.
            details:
              type: array
              description: Per-field detail, present on validation errors.
              items:
                type: object
                properties:
                  field:
                    type: string
                  message:
                    type: string
                required:
                  - field
                  - message
          required:
            - code
            - message
      required:
        - error
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: A `pc_…` token generated from Settings > API & MCP.

````