Random Story Opening and Closing Pair Generator

Description

Match supplied fictional openings and endings by shared tags, shuffle incompatible distractors, and disclose every compatible ending including alternatives outside the choices.

A structured creative brief combines a supplied bank of fictional material with explicit sequencing, timing, or compatibility rules. IDs and tags make those constraints inspectable; they do not assess the artistic meaning or quality of a scene.

Match supplied fictional openings and endings by shared tags, shuffle incompatible distractors, and disclose every compatible ending including alternatives outside the choices.

When to use this tool

Use this generator to create reproducible story opening closing pair cases from the supplied model or bank. Inspect the returned evidence before using cases in a test or exercise.

How to use the tool and how it works

Supply openings, endings, distractorCount, wrapWidth in the field shapes below. Set seed when you need an explicit replay.
Run the tool and correct any input error. For generated controls, distinguish a successful fixture containing an invalid case from failure to generate the fixture.
Read opening, choices, compatible. Use the conventions below and keep answer-bearing fields separate when presenting an exercise.

Choose an opening having at least one shared-tag ending and enough zero-overlap distractors. Select one compatible ending, sample incompatible distractors, and shuffle the choices. Disclose every compatible ending and its shared tags, including matches outside the displayed choices.^[1]

Input field	Meaning and units	Accepted input
openings	Openings	Required. Array of Object; no unknown keys.; minimum items 1; maximum items 16.
openings[].id	Literal identifier used to match records, independently of their display labels.	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 64.
openings[].text	Text	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 1024.
openings[].tags	Tags	Required. Array of Text; minimum UTF-16 length 1; maximum UTF-16 length 64.; minimum items 0; maximum items 16.
endings	Endings	Required. Array of Object; no unknown keys.; minimum items 1; maximum items 16.
endings[].id	Literal identifier used to match records, independently of their display labels.	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 64.
endings[].text	Text	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 1024.
endings[].tags	Tags	Required. Array of Text; minimum UTF-16 length 1; maximum UTF-16 length 64.; minimum items 0; maximum items 16.
distractorCount	Distractor Count	Required. Safe integer; minimum 0; maximum 15.
wrapWidth	Wrap Width	Required. Safe integer; minimum 1; maximum 4096.
seed	Optional numeric seed; takes precedence over context randomness. Without either, use the fixed tool.io default seed.	Optional. Safe integer.

Output field	Interpretation	Returned shape
opening	Opening	Required. Object; no unknown keys.
opening.id	Literal identifier used to match records, independently of their display labels.	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 64.
opening.body	Body	Required. Object; no unknown keys.
opening.body.text	Text	Required. Text; maximum UTF-16 length 65536.
opening.body.lineCount	Line Count	Required. Safe integer; minimum 0; maximum 9007199254740991.
choices	Choices	Required. Array of Object; no unknown keys.; minimum items 1; maximum items 16.
choices[].id	Literal identifier used to match records, independently of their display labels.	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 64.
choices[].body	Body	Required. Object; no unknown keys.
choices[].body.text	Text	Required. Text; maximum UTF-16 length 65536.
choices[].body.lineCount	Line Count	Required. Safe integer; minimum 0; maximum 9007199254740991.
compatible	Compatible	Required. Array of Object; no unknown keys.; minimum items 1; maximum items 16.
compatible[].endingId	Ending Id	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 64.
compatible[].sharedTags	Shared Tags	Required. Array of Text; minimum UTF-16 length 1; maximum UTF-16 length 64.; minimum items 0; maximum items 16.
randomness	Replay metadata: source is seed or context; seed is the normalized 32-bit seed or null for a context source.	Required. Object; no unknown keys.
randomness.seed	Optional numeric replay seed; normalization and precedence are explained below.	Required. Safe integer. or Null.
randomness.source	Source	Required. Text; one of "context", "seed".

An explicit safe-integer seed takes precedence over injected context randomness and is normalized to an unsigned 32-bit integer. With no seed and no context source, replay uses the fixed tool.io default seed. A context source must return finite values from zero inclusive to one exclusive; its advancing state must be retained separately. randomness records the source and normalized seed, or null for context. These generators are not cryptographic random sources.

json

{
  "input": {
    "openings": [
      {
        "id": "door",
        "text": "She left home.",
        "tags": [
          "home"
        ]
      }
    ],
    "endings": [
      {
        "id": "return",
        "text": "She returned.",
        "tags": [
          "home"
        ]
      },
      {
        "id": "storm",
        "text": "Waves rose.",
        "tags": [
          "sea"
        ]
      }
    ],
    "distractorCount": 1,
    "wrapWidth": 80,
    "seed": 42
  },
  "output": {
    "opening": {
      "id": "door",
      "body": {
        "text": "She left home.",
        "lineCount": 1
      }
    },
    "choices": [
      {
        "id": "storm",
        "body": {
          "text": "Waves rose.",
          "lineCount": 1
        }
      },
      {
        "id": "return",
        "body": {
          "text": "She returned.",
          "lineCount": 1
        }
      }
    ],
    "compatible": [
      {
        "endingId": "return",
        "sharedTags": [
          "home"
        ]
      }
    ],
    "randomness": {
      "seed": 42,
      "source": "seed"
    }
  }
}

Limitations and assumptions

Compatibility means nonempty tag intersection only, not literary quality. An opening with insufficient distractors is ineligible; the complete compatibility key should remain separate from student prompts.
A replay requires the same complete input and implementation. Randomized construction does not guarantee uniform coverage of every feasible output; finite samples can repeat unless a distinct-selection rule is explicitly stated.
The field tables state structural bounds; cross-field constraints and bounded search or output budgets also apply. Unknown keys are rejected where the object contract disallows them. Input errors are distinct from null fields and deliberate invalid controls in a successful output.

Alternative or Complementary methods

For a supplied example, inspect the returned construction or delegated check directly. To evaluate a consumer, also test cases chosen for its own boundaries; a generated finite corpus does not establish exhaustive coverage.

References

Tool behavior and example: Random Story Opening and Closing Pair Generator — tool.io

Similar or alternative tools

Random Improv Location and Occupation Pairings Generator
Draw compatible supplied fictional locations and occupations with explicit tone filtering, pair repetition policy, and occurrence counts.
Random Nested Story Frame Generator
Build a distinct supplied storyteller stack and balanced LIFO entry/exit markers at a bounded depth; narrative quality is caller-reviewed.