VHGENGINE

by app.railway.up.engine-production-3bdc

get_hook

Read-only

Fetch one bought hook in full, including its parsed score. Free (WP-G).

    Account-scoped: a foreign or unknown id is not_found (no existence leak). Args:
    hook_id (from a generate/batch/remix response or list_hooks), api_key. Returns
    {hook_id, text, archetype, claim_type, mode, platform, topic, score_total, score,
    prompt_version, request_id, created_at, outcomes:[...], outcome_summary:{count,
    max_views, avg_views}}. Report results with report_outcome. Errors: unauthorized,
    not_found, rate_limited.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`api_key`	No	API key for this call. Omit to fall back to the Authorization: Bearer / X-API-Key request header (streamable-HTTP only), then the VHGENGINE_API_KEY env var (the stdio default). No key resolvable -> unauthorized.
`hook_id`	Yes	The hook's id, as returned in the `hooks[].hook_id` of a generate/batch/remix response or by list_hooks. Account-scoped: an id you do not own reads as not_found.

Output Schema

TableJSON Schema

Name	Required	Description
`mode`	No	Engine that produced it (instant\|smart\|research\|remix).
`text`	No	The hook line.
`score`	No	Per-dimension score breakdown.
`topic`	No	Topic it was generated from.
`hook_id`	No	The hook's id.
`outcomes`	No	Outcomes you have reported against this hook.
`platform`	No	Platform it was written for.
`archetype`	No	Archetype it was written in.
`claim_type`	No	What kind of claim it makes.
`created_at`	No	When it was generated, ISO-8601 UTC.
`request_id`	No	The generate call that bought it.
`score_total`	No	Total craft score.
`prompt_version`	No	Prompt build that produced it, for reproducibility.
`outcome_summary`	No	{count, max_views, avg_views} over those outcomes.
`contains_placeholder_stat`	No	true when the text carries an unverified number you must replace before posting (e.g. '90% of people'). Treat as an edit-before-use flag.

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedAug 2, 2026

addedInput schema / properties / api_key / description

Added value: +"API key for this call. Omit to fall back to the Authorization: Bearer / X-API-Key request header (streamable-HTTP only), then the VHGENGINE_API_KEY env var (the stdio default). No key resolvable -> unauthorized."

addedInput schema / properties / hook_id / description

Added value: +"The hook's id, as returned in the `hooks[].hook_id` of a generate/batch/remix response or by list_hooks. Account-scoped: an id you do not own reads as not_found."

addedOutput schema / description

Added value: +"One bought hook in full, with its parsed score and reported outcomes."

addedOutput schema / properties

Added value: +{
+  "archetype": {
+    "description": "Archetype it was written in.",
+    "type": [
+      "string",
+      "null"
+    ]
+  },
+  "claim_type": {
+    "description": "What kind of claim it makes.",
+    "type": [
+      "string",
+      "null"
+    ]
+  },
+  "contains_placeholder_stat": {
+    "description": "true when the text carries an unverified number you must replace before posting (e.g. '90% of people'). Treat as an edit-before-use flag.",
+    "type": [
+      "boolean",
+      "null"
+    ]
+  },
+  "created_at": {
+    "description": "When it was generated, ISO-8601 UTC.",
+    "type": [
+      "string",
+      "null"
+    ]
+  },
+  "hook_id": {
+    "description": "The hook's id.",
+    "type": [
+      "string",
+      "null"
+    ]
+  },
+  "mode": {
+    "description": "Engine that produced it (instant|smart|research|remix).",
+    "type": [
+      "string",
+      "null"
+    ]
+  },
+  "outcome_summary": {
+    "description": "{count, max_views, avg_views} over those outcomes.",
+    "type": [
+      "object",
+      "null"
+    ]
+  },
+  "outcomes": {
+    "description": "Outcomes you have reported against this hook.",
+    "type": [
+      "array",
+      "null"
+    ]
+  },
+  "platform": {
+    "description": "Platform it was written for.",
+    "type": [
+      "string",
+      "null"
+    ]
+  },
+  "prompt_version": {
+    "description": "Prompt build that produced it, for reproducibility.",
+    "type": [
+      "string",
+      "null"
+    ]
+  },
+  "request_id": {
+    "description": "The generate call that bought it.",
+    "type": [
+      "string",
+      "null"
+    ]
+  },
+  "score": {
+    "description": "Per-dimension score breakdown.",
+    "type": [
+      "object",
+      "null"
+    ]
+  },
+  "score_total": {
+    "description": "Total craft score.",
+    "type": [
+      "number",
+      "null"
+    ]
+  },
+  "text": {
+    "description": "The hook line.",
+    "type": [
+      "string",
+      "null"
+    ]
+  },
+  "topic": {
+    "description": "Topic it was generated from.",
+    "type": [
+      "string",
+      "null"
+    ]
+  }
+}

removedOutput schema / title
```
Removed value: -"get_hookDictOutput"
```

Changed1 schema field changedJul 20, 2026
- addedInput schema / additionalProperties
```
Added value: +false
```
First observedJul 18, 2026

TDQS

A4.2/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Even though readOnlyHint annotation already signals a safe read, the description adds meaningful behavior: account-scoping with no existence leak, error types (unauthorized, not_found, rate_limited), cost (free), and a hint to report results via report_outcome. These details go well beyond the annotation.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is well-organized with a clear purpose sentence followed by scoping, args, returns, and errors. It is slightly redundant with the schema's parameter descriptions, but each section carries useful information and the overall length is appropriate for the tool.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description covers the full context: what the tool does, how to obtain the required ID, account scoping behavior, return structure, error conditions, and a follow-up action (report_outcome). Even with an output schema present, the explicit return field list and error handling make this highly complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema already has 100% coverage for both parameters, with detailed descriptions for hook_id and api_key. The description merely restates the parameter sources without adding new meaning, so it meets the baseline but does not exceed it.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Description starts with 'Fetch one bought hook in full, including its parsed score,' which precisely states the action and resource. It distinguishes from sibling list_hooks (which lists) and score_hook (which scores) by focusing on retrieval of a single detailed hook.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description tells you where hook_id comes from and that the call is free, but does not explicitly discuss when to use this versus alternatives like list_hooks or score_hook. Usage is inferred rather than directly guided.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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