# align_span
Canonical HTML page: https://bitterclip.com/docs/assistants/tools/align_span
Surface: default model and app
Product release: 1dce717408a55fac1047e7d779177fa3ef8ede51
Public contract commit: 1ce47f7857ae3d9b6933fe83d5c33de3ae5efc64
Public contract SHA-256: 241d47d25e4b4c1dae9d2263793874d06fc4ba7bc3c78d4cf2bc63fbb32ed7dc
Descriptor SHA-256: 885d46f3ca3939dec2ace0cd6e93611c8b3f741f2d8f7a82e0adfe1452cc9a9e
Captured: 2026-09-24T16:39:30.100Z
Source: https://app.bitterclip.com/api/v1/mcp_descriptors.json
Promote a provisional transcript-backed span to a cited span, or explicitly reject it. Accepts exactly one target: a Program occurrence (episode_id plus the exact occ_... occurrence_id from episode_read's Program map) or a moment_id. Alignment only records transcript-unit anchors and boundary offsets; it preserves the existing media seconds and never invents anchors. Aligning or rejecting an occurrence changes the Program digest without advancing the revision; re-read the Episode before the next page or edit. Boundary evidence does not depend on the digest and stays valid. If the recording lacks a word-timed transcript or no units overlap the evidence window, the operation returns ok:false with a typed error instead of writing fake anchors.
The JSON blocks below are the exact MCP descriptor projections served by Rails for the named profiles at capture time. Security schemes and resource URIs may vary by connected host.
## Default model descriptor
```json
{
"name": "align_span",
"title": "Align or reject a span",
"description": "Promote a provisional transcript-backed span to a cited span, or explicitly reject it. Accepts exactly one target: a Program occurrence (episode_id plus the exact occ_... occurrence_id from episode_read's Program map) or a moment_id. Alignment only records transcript-unit anchors and boundary offsets; it preserves the existing media seconds and never invents anchors. Aligning or rejecting an occurrence changes the Program digest without advancing the revision; re-read the Episode before the next page or edit. Boundary evidence does not depend on the digest and stays valid. If the recording lacks a word-timed transcript or no units overlap the evidence window, the operation returns ok:false with a typed error instead of writing fake anchors.",
"inputSchema": {
"type": "object",
"properties": {
"episode_id": {
"type": "string",
"description": "Episode or Clip public ID (comp_...) that contains the occurrence. Alias: composition_id."
},
"composition_id": {
"type": "string",
"description": "Backward-compatible alias for episode_id."
},
"occurrence_id": {
"type": "string",
"description": "Exact occ_... occurrence ID from episode_read's Program map, resolved inside episode_id. Segment UUIDs and positions refuse."
},
"moment_id": {
"type": "string",
"description": "Moment public ID to align or reject."
},
"action": {
"type": "string",
"enum": [
"auto",
"accept",
"reject"
],
"description": "auto/accept computes anchors when possible; reject records an explicit rejection marker and receipt while keeping the span provisional."
},
"transcript_window": {
"type": "object",
"description": "Optional source-time evidence window for transcript-unit overlap search. Omit to use the target's current media seconds.",
"properties": {
"start_seconds": {
"type": "number"
},
"end_seconds": {
"type": "number"
}
}
},
"reason": {
"type": "string",
"description": "Optional rejection reason or operator note."
}
},
"required": [],
"additionalProperties": false
},
"annotations": {
"readOnlyHint": false,
"destructiveHint": false,
"idempotentHint": false,
"openWorldHint": false
},
"securitySchemes": [
{
"type": "noauth"
}
],
"_meta": {
"securitySchemes": [
{
"type": "noauth"
}
],
"ui": {
"visibility": [
"model",
"app"
]
},
"openai/widgetAccessible": true
}
}
```
## App descriptor
```json
{
"name": "align_span",
"title": "Align or reject a span",
"description": "Promote a provisional transcript-backed span to a cited span, or explicitly reject it. Accepts exactly one target: a Program occurrence (episode_id plus the exact occ_... occurrence_id from episode_read's Program map) or a moment_id. Alignment only records transcript-unit anchors and boundary offsets; it preserves the existing media seconds and never invents anchors. Aligning or rejecting an occurrence changes the Program digest without advancing the revision; re-read the Episode before the next page or edit. Boundary evidence does not depend on the digest and stays valid. If the recording lacks a word-timed transcript or no units overlap the evidence window, the operation returns ok:false with a typed error instead of writing fake anchors.",
"inputSchema": {
"type": "object",
"properties": {
"episode_id": {
"type": "string",
"description": "Episode or Clip public ID (comp_...) that contains the occurrence. Alias: composition_id."
},
"composition_id": {
"type": "string",
"description": "Backward-compatible alias for episode_id."
},
"occurrence_id": {
"type": "string",
"description": "Exact occ_... occurrence ID from episode_read's Program map, resolved inside episode_id. Segment UUIDs and positions refuse."
},
"moment_id": {
"type": "string",
"description": "Moment public ID to align or reject."
},
"action": {
"type": "string",
"enum": [
"auto",
"accept",
"reject"
],
"description": "auto/accept computes anchors when possible; reject records an explicit rejection marker and receipt while keeping the span provisional."
},
"transcript_window": {
"type": "object",
"description": "Optional source-time evidence window for transcript-unit overlap search. Omit to use the target's current media seconds.",
"properties": {
"start_seconds": {
"type": "number"
},
"end_seconds": {
"type": "number"
}
}
},
"reason": {
"type": "string",
"description": "Optional rejection reason or operator note."
}
},
"required": [],
"additionalProperties": false
},
"annotations": {
"readOnlyHint": false,
"destructiveHint": false,
"idempotentHint": false,
"openWorldHint": false
},
"securitySchemes": [
{
"type": "noauth"
}
],
"_meta": {
"securitySchemes": [
{
"type": "noauth"
}
],
"ui": {
"visibility": [
"model",
"app"
]
},
"openai/widgetAccessible": true
},
"outputSchema": {
"type": "object",
"properties": {
"ok": {
"type": "boolean"
},
"status": {
"type": "string",
"enum": [
"aligned",
"rejected",
"failed"
]
},
"target": {
"type": "object"
},
"span": {
"type": "object"
},
"error_code": {
"type": "string"
},
"message": {
"type": "string"
},
"receipt_id": {
"type": "string"
},
"receipt_public_id": {
"type": "string"
},
"transcript_id": {
"type": "string"
},
"transcript_version": {
"type": "string"
},
"unit_ids": {
"type": "array",
"items": {
"type": "string"
}
},
"tool_outcome": {
"description": "Consequence of a successful alignment or rejection (absent when ok is false). An occurrence names its Episode or Clip as parent and the Program digest it moved; the revision never advances. A Moment reports only itself and its receipt. align_span has no retry key or inverse.",
"oneOf": [
{
"type": "object",
"properties": {
"schema": {
"type": "string",
"enum": [
"bitterclip.tool_outcome.v1"
]
},
"tool": {
"type": "string",
"enum": [
"align_span"
]
},
"status": {
"type": "string",
"enum": [
"aligned",
"rejected"
]
},
"target": {
"type": "object",
"properties": {
"type": {
"type": "string",
"enum": [
"occurrence"
]
},
"id": {
"type": "string",
"pattern": "^occ_[a-z0-9]{20}$"
}
},
"required": [
"type",
"id"
],
"additionalProperties": false
},
"parent": {
"type": "object",
"properties": {
"type": {
"type": "string",
"enum": [
"episode",
"clip"
]
},
"id": {
"type": "string",
"pattern": "^comp_[a-z0-9]+$"
}
},
"required": [
"type",
"id"
],
"additionalProperties": false
},
"receipt": {
"type": "object",
"properties": {
"id": {
"type": "string",
"pattern": "^rcpt_[a-z0-9]+$"
}
},
"required": [
"id"
],
"additionalProperties": false
},
"digests": {
"type": "object",
"properties": {
"before": {
"type": "string",
"pattern": "^[0-9a-f]{64}$"
},
"result": {
"type": "string",
"pattern": "^[0-9a-f]{64}$"
},
"current": {
"type": "string",
"pattern": "^[0-9a-f]{64}$"
}
},
"required": [
"before",
"result",
"current"
],
"additionalProperties": false,
"description": "Program digests before and after this write, and now. Read continuations pin the digest; boundary evidence does not depend on it."
},
"checks": {
"type": "object",
"properties": {
"revision": {
"type": "string",
"enum": [
"advanced",
"unchanged"
]
},
"program_digest": {
"type": "string",
"enum": [
"changed",
"unchanged"
]
}
},
"required": [
"revision",
"program_digest"
],
"additionalProperties": false,
"description": "The currentness checks this write moved: the Composition revision and the Program digest. Boundary evidence depends on neither; the next edit re-verifies each token at its point."
}
},
"required": [
"schema",
"tool",
"status",
"target",
"parent",
"receipt",
"digests",
"checks"
],
"additionalProperties": false
},
{
"type": "object",
"properties": {
"schema": {
"type": "string",
"enum": [
"bitterclip.tool_outcome.v1"
]
},
"tool": {
"type": "string",
"enum": [
"align_span"
]
},
"status": {
"type": "string",
"enum": [
"aligned",
"rejected"
]
},
"target": {
"type": "object",
"properties": {
"type": {
"type": "string",
"enum": [
"moment"
]
},
"id": {
"type": "string",
"pattern": "^moment_[a-z0-9]+$"
}
},
"required": [
"type",
"id"
],
"additionalProperties": false
},
"receipt": {
"type": "object",
"properties": {
"id": {
"type": "string",
"pattern": "^rcpt_[a-z0-9]+$"
}
},
"required": [
"id"
],
"additionalProperties": false
}
},
"required": [
"schema",
"tool",
"status",
"target",
"receipt"
],
"additionalProperties": false
}
]
}
},
"required": [],
"additionalProperties": false
}
}
```
## Live Workspace descriptor
```json
{
"name": "align_span",
"title": "Align or reject a span",
"description": "Promote a provisional transcript-backed span to a cited span, or explicitly reject it. Accepts exactly one target: a Program occurrence (episode_id plus the exact occ_... occurrence_id from episode_read's Program map) or a moment_id. Alignment only records transcript-unit anchors and boundary offsets; it preserves the existing media seconds and never invents anchors. Aligning or rejecting an occurrence changes the Program digest without advancing the revision; re-read the Episode before the next page or edit. Boundary evidence does not depend on the digest and stays valid. If the recording lacks a word-timed transcript or no units overlap the evidence window, the operation returns ok:false with a typed error instead of writing fake anchors.",
"inputSchema": {
"type": "object",
"properties": {
"episode_id": {
"type": "string",
"description": "Episode or Clip public ID (comp_...) that contains the occurrence. Alias: composition_id."
},
"composition_id": {
"type": "string",
"description": "Backward-compatible alias for episode_id."
},
"occurrence_id": {
"type": "string",
"description": "Exact occ_... occurrence ID from episode_read's Program map, resolved inside episode_id. Segment UUIDs and positions refuse."
},
"moment_id": {
"type": "string",
"description": "Moment public ID to align or reject."
},
"action": {
"type": "string",
"enum": [
"auto",
"accept",
"reject"
],
"description": "auto/accept computes anchors when possible; reject records an explicit rejection marker and receipt while keeping the span provisional."
},
"transcript_window": {
"type": "object",
"description": "Optional source-time evidence window for transcript-unit overlap search. Omit to use the target's current media seconds.",
"properties": {
"start_seconds": {
"type": "number"
},
"end_seconds": {
"type": "number"
}
}
},
"reason": {
"type": "string",
"description": "Optional rejection reason or operator note."
}
},
"required": [],
"additionalProperties": false
},
"annotations": {
"readOnlyHint": false,
"destructiveHint": false,
"idempotentHint": false,
"openWorldHint": false
},
"securitySchemes": [
{
"type": "noauth"
}
],
"_meta": {
"securitySchemes": [
{
"type": "noauth"
}
]
},
"outputSchema": {
"type": "object",
"properties": {
"ok": {
"type": "boolean"
},
"status": {
"type": "string",
"enum": [
"aligned",
"rejected",
"failed"
]
},
"target": {
"type": "object"
},
"span": {
"type": "object"
},
"error_code": {
"type": "string"
},
"message": {
"type": "string"
},
"receipt_id": {
"type": "string"
},
"receipt_public_id": {
"type": "string"
},
"transcript_id": {
"type": "string"
},
"transcript_version": {
"type": "string"
},
"unit_ids": {
"type": "array",
"items": {
"type": "string"
}
},
"tool_outcome": {
"description": "Consequence of a successful alignment or rejection (absent when ok is false). An occurrence names its Episode or Clip as parent and the Program digest it moved; the revision never advances. A Moment reports only itself and its receipt. align_span has no retry key or inverse.",
"oneOf": [
{
"type": "object",
"properties": {
"schema": {
"type": "string",
"enum": [
"bitterclip.tool_outcome.v1"
]
},
"tool": {
"type": "string",
"enum": [
"align_span"
]
},
"status": {
"type": "string",
"enum": [
"aligned",
"rejected"
]
},
"target": {
"type": "object",
"properties": {
"type": {
"type": "string",
"enum": [
"occurrence"
]
},
"id": {
"type": "string",
"pattern": "^occ_[a-z0-9]{20}$"
}
},
"required": [
"type",
"id"
],
"additionalProperties": false
},
"parent": {
"type": "object",
"properties": {
"type": {
"type": "string",
"enum": [
"episode",
"clip"
]
},
"id": {
"type": "string",
"pattern": "^comp_[a-z0-9]+$"
}
},
"required": [
"type",
"id"
],
"additionalProperties": false
},
"receipt": {
"type": "object",
"properties": {
"id": {
"type": "string",
"pattern": "^rcpt_[a-z0-9]+$"
}
},
"required": [
"id"
],
"additionalProperties": false
},
"digests": {
"type": "object",
"properties": {
"before": {
"type": "string",
"pattern": "^[0-9a-f]{64}$"
},
"result": {
"type": "string",
"pattern": "^[0-9a-f]{64}$"
},
"current": {
"type": "string",
"pattern": "^[0-9a-f]{64}$"
}
},
"required": [
"before",
"result",
"current"
],
"additionalProperties": false,
"description": "Program digests before and after this write, and now. Read continuations pin the digest; boundary evidence does not depend on it."
},
"checks": {
"type": "object",
"properties": {
"revision": {
"type": "string",
"enum": [
"advanced",
"unchanged"
]
},
"program_digest": {
"type": "string",
"enum": [
"changed",
"unchanged"
]
}
},
"required": [
"revision",
"program_digest"
],
"additionalProperties": false,
"description": "The currentness checks this write moved: the Composition revision and the Program digest. Boundary evidence depends on neither; the next edit re-verifies each token at its point."
}
},
"required": [
"schema",
"tool",
"status",
"target",
"parent",
"receipt",
"digests",
"checks"
],
"additionalProperties": false
},
{
"type": "object",
"properties": {
"schema": {
"type": "string",
"enum": [
"bitterclip.tool_outcome.v1"
]
},
"tool": {
"type": "string",
"enum": [
"align_span"
]
},
"status": {
"type": "string",
"enum": [
"aligned",
"rejected"
]
},
"target": {
"type": "object",
"properties": {
"type": {
"type": "string",
"enum": [
"moment"
]
},
"id": {
"type": "string",
"pattern": "^moment_[a-z0-9]+$"
}
},
"required": [
"type",
"id"
],
"additionalProperties": false
},
"receipt": {
"type": "object",
"properties": {
"id": {
"type": "string",
"pattern": "^rcpt_[a-z0-9]+$"
}
},
"required": [
"id"
],
"additionalProperties": false
}
},
"required": [
"schema",
"tool",
"status",
"target",
"receipt"
],
"additionalProperties": false
}
]
}
},
"required": [],
"additionalProperties": false
}
}
```
## Errors
```json
[
"composition_not_found",
"program_occurrence_not_found",
"moment_not_found",
"clip_not_found",
"invalid_time_range",
"transcript_not_word_timed",
"no_overlapping_units",
"invalid_input"
]
```
## Examples
```json
[
{
"label": "Align a Moment",
"input": {
"moment_id": "moment_...",
"action": "accept"
}
},
{
"label": "Reject a provisional occurrence span",
"input": {
"episode_id": "comp_...",
"occurrence_id": "occ_...",
"action": "reject",
"reason": "Imported range does not match transcript evidence."
}
}
]
```