VHGENGINE

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

list_hooks

Read-only

List the hooks this account has bought, newest first. Free (WP-G).

    Retrievable for 90 days. Args: mode (instant|smart|research|remix, or a generate
    alias such as template/search), since (ISO timestamp), tag (exact fleet-tag match),
    topic (substring), request_id (recover one charged call's hooks), unreported (only
    hooks a first outcome report can reward), limit (1-100), offset, api_key. Returns
    {hooks:[{hook_id, text, archetype, mode, score_total, created_at, request_id}],
    limit, offset, total}. Errors: unauthorized, invalid_request, rate_limited.

Input Schema

TableJSON Schema

Name	Required	Description
`tag`	No	Filter to hooks carrying EXACTLY this fleet tag: a lowercase slug of 1-40 chars of [a-z0-9_-], matched LITERALLY. `_` is a legal tag character and is NOT a wildcard here, and neither is `%`; there is no pattern matching. Omit for every tag.
`mode`	No	Filter to hooks bought from this engine. Canonical stored values: instant\|smart\|research\|remix; the generate aliases (template\|off\|quick, llm\|on\|fast, search\|deep\|deep_research) are accepted and resolved to their canonical value. Omit for every mode.
`limit`	No	Max hooks to return, 1-200. Above the ceiling is an invalid_request, never a silent truncation.
`since`	No	Return only rows created at or after this UTC timestamp. Compared LEXICALLY against stored 'YYYY-MM-DDTHH:MM:SSZ' values, so pass that exact format (a date-only string or a unix epoch silently selects the wrong window). Omit for no lower bound.
`topic`	No	Case-insensitive SUBSTRING match against the topic a hook was generated for (unlike `tag`, which is exact). Omit for every topic.
`offset`	No	Number of rows to skip for paging, 0-9223372036854775807. Page with offset += the limit you actually requested; `total` in the response is the unpaged count. The ceiling is SQLite's largest bindable integer: above it the read could only ever have been a 500, so it is a typed invalid_request instead.
`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.
`request_id`	No	Return ONLY the hooks produced by this request_id. This is the exact recovery filter: an agent that lost a generate response reads the request_id off list_runs (or its own log) and gets back precisely the hooks that call was charged for, with no guessing by topic or timestamp. An unknown or foreign request_id returns an empty page, never an error.
`unreported`	No	true = only hooks with no outcome yet, i.e. the ones a first report_outcome can still earn a reward on. false = only hooks already reported. Omit for both.

Output Schema

TableJSON Schema

Name	Required	Description
`hooks`	No	This page: {hook_id, text, archetype, mode, score_total, created_at, request_id}. hook_id is what report_outcome and get_hook take.
`limit`	No	Page size actually applied.
`total`	No	Rows matching the filters IGNORING paging: the number to page through, not the number returned here.
`offset`	No	Offset this page started at.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedAug 3, 2026

addedInput schema / properties / request_id

Added value: +{
+  "anyOf": [
+    {
+      "maxLength": 64,
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Return ONLY the hooks produced by this request_id. This is the exact recovery filter: an agent that lost a generate response reads the request_id off list_runs (or its own log) and gets back precisely the hooks that call was charged for, with no guessing by topic or timestamp. An unknown or foreign request_id returns an empty page, never an error.",
+  "maxLength": 64,
+  "title": "Request Id"
+}

Changed19 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 / limit / description

Added value: +"Max hooks to return, 1-200. Above the ceiling is an invalid_request, never a silent truncation."

addedInput schema / properties / limit / maximum
```
Added value: +200
```
addedInput schema / properties / limit / minimum
```
Added value: +1
```

changedInput schema / properties / mode / anyOf

Previous value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "enum": [
+      "deep",
+      "deep_research",
+      "fast",
+      "instant",
+      "llm",
+      "off",
+      "on",
+      "quick",
+      "remix",
+      "research",
+      "search",
+      "smart",
+      "template"
+    ],
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

addedInput schema / properties / mode / description

Added value: +"Filter to hooks bought from this engine. Canonical stored values: instant|smart|research|remix; the generate aliases (template|off|quick, llm|on|fast, search|deep|deep_research) are accepted and resolved to their canonical value. Omit for every mode."

addedInput schema / properties / mode / enum

Added value: +[
+  "deep",
+  "deep_research",
+  "fast",
+  "instant",
+  "llm",
+  "off",
+  "on",
+  "quick",
+  "remix",
+  "research",
+  "search",
+  "smart",
+  "template",
+  null
+]

addedInput schema / properties / offset / description

Added value: +"Number of rows to skip for paging, 0-9223372036854775807. Page with offset += the limit you actually requested; `total` in the response is the unpaged count. The ceiling is SQLite's largest bindable integer: above it the read could only ever have been a 500, so it is a typed invalid_request instead."

addedInput schema / properties / offset / maximum
```
Added value: +9223372036854776000
```
addedInput schema / properties / offset / minimum
```
Added value: +0
```

addedInput schema / properties / since / description

Added value: +"Return only rows created at or after this UTC timestamp. Compared LEXICALLY against stored 'YYYY-MM-DDTHH:MM:SSZ' values, so pass that exact format (a date-only string or a unix epoch silently selects the wrong window). Omit for no lower bound."

changedInput schema / properties / tag / anyOf

Previous value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "pattern": "^[a-z0-9_-]{1,40}$",
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

addedInput schema / properties / tag / description

Added value: +"Filter to hooks carrying EXACTLY this fleet tag: a lowercase slug of 1-40 chars of [a-z0-9_-], matched LITERALLY. `_` is a legal tag character and is NOT a wildcard here, and neither is `%`; there is no pattern matching. Omit for every tag."

addedInput schema / properties / tag / pattern
```
Added value: +"^[a-z0-9_-]{1,40}$"
```

addedInput schema / properties / topic / description

Added value: +"Case-insensitive SUBSTRING match against the topic a hook was generated for (unlike `tag`, which is exact). Omit for every topic."

addedInput schema / properties / unreported / description

Added value: +"true = only hooks with no outcome yet, i.e. the ones a first report_outcome can still earn a reward on. false = only hooks already reported. Omit for both."

addedOutput schema / description

Added value: +"A page of the hooks this account has bought, newest first. Free."

addedOutput schema / properties

Added value: +{
+  "hooks": {
+    "description": "This page: {hook_id, text, archetype, mode, score_total, created_at, request_id}. hook_id is what report_outcome and get_hook take.",
+    "type": [
+      "array",
+      "null"
+    ]
+  },
+  "limit": {
+    "description": "Page size actually applied.",
+    "type": [
+      "number",
+      "null"
+    ]
+  },
+  "offset": {
+    "description": "Offset this page started at.",
+    "type": [
+      "number",
+      "null"
+    ]
+  },
+  "total": {
+    "description": "Rows matching the filters IGNORING paging: the number to page through, not the number returned here.",
+    "type": [
+      "number",
+      "null"
+    ]
+  }
+}

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

Changed1 schema field changedJul 20, 2026

addedInput schema / properties / unreported

Added value: +{
+  "anyOf": [
+    {
+      "type": "boolean"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Unreported"
+}

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

TDQS

A4.1/5.0

Behavior4/5

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

Beyond the readOnlyHint annotation, the description adds cost (Free), data retention (90 days), error types (unauthorized, invalid_request, rate_limited), and the return shape. It does not contradict annotations. The limit discrepancy is noted but belongs to parameter semantics.

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

Conciseness5/5

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

The description is a single compact paragraph, front-loaded with purpose, then a dense list of args and return/error info. Every sentence earns its place without verbosity.

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

Completeness4/5

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

Given 9 parameters and output schema, the description covers cost, retention, errors, and return structure. It is nearly complete, but the limit inaccuracy (1-100 vs schema's 1-200) creates a gap in reliable context, so not a 5.

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

Parameters2/5

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

Schema coverage is 100% with rich descriptions, so baseline is 3. The description summarizes parameters, but it incorrectly states 'limit (1-100)' while the schema allows 1-200. This active misinformation about a parameter range reduces trust and scores below baseline.

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?

The description starts with "List the hooks this account has bought, newest first," which is a specific verb+resource+scope statement. It clearly distinguishes from sibling tools like get_hook (single hook) and generate_hooks (creation).

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

Usage Guidelines4/5

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

The description provides useful context: 'Free (WP-G)' and 'Retrievable for 90 days.' It implies when the tool can be used, but does not explicitly compare against alternatives or state exclusions. Despite no explicit alternatives, the context is clear enough for a 4.

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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