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Video Hooks

Why short-video hooks and retention structures actually work, grounded in attention psychology

Unify Dynamics LLC

Documentation
Tools9read-only
Sign-inNoneno account, no key
Data keptNoneprocessed in memory
PriceFreeoptional Pro limits
StatusLiveMCP + REST
Works withMCP · RESTany agent

Try asking

Real questions, and the tools your agent calls to answer them.

Why does the curiosity gap hook work?
Tools called
hook_type_info
What hook types do you cover?
Tools called
list_hook_types
What's an open loop retention structure?
Tools called
retention_structure_info
What retention structures do you cover?
Tools called
list_retention_structures
Give me a checklist for my video's first 3 seconds
Tools called
first_3_seconds_checklist
Best hook for a tutorial video
Tools called
recommend_hook
What are common mistakes that kill retention?
Tools called
common_mistakes
What's the Zeigarnik effect?
Tools called
hook_glossary
Which structures use a callback ending?
Tools called
search_reference

About

Hookline is a fully local short-video hook & retention-structure reference. hook_type_info explains one opening-hook technique — curiosity gap, bold/contrarian claim, visual pattern interrupt, direct callout, problem-agitate, in medias res, countdown tease, controversial take, relatable moment, credential stack — with an example, the psychology behind why it works, and its common failure mode; list_hook_types browses all 10. retention_structure_info explains one whole-video structure — open loop, loop/callback ending, escalating stakes, three-act micro-structure, before-after-bridge, problem-solution-proof, cliffhanger segmenting, rule-of-three reveal — the same way; list_retention_structures browses all 8. first_3_seconds_checklist gives a practical opening checklist. recommend_hook suggests fitting hooks and structures for a stated content goal (tutorial, story, product demo, listicle, controversial opinion, comedy, transformation, series). common_mistakes lists frequent retention mistakes with why each hurts. hook_glossary defines core metrics (retention rate, watch time, drop-off point, loop rate, completion rate, the Zeigarnik effect, pattern interrupt, open loop). search_reference keyword-searches everything. Keyless; fully local; zero upstream calls; nothing stored.

Sources: Original synthesis grounded in established, named attention-psychology concepts (curiosity-gap theory, the Zeigarnik effect, novelty/habituation, loss aversion, source-credibility bias); hand-curated, not scraped from any single source; fully local, zero upstream calls

Privacy

The publisher, Unify Dynamics LLC, states that tool inputs are processed in memory and not retained.

Data not collectedNo account, no profile, no stored prompts or results.
Privacy policyTerms

What it can do

9 tools, grouped by job. Every one is read-only or compute-only.

OpenAPI
Hooks2 tools
  • Hook type infoOne opening-hook technique's description, example, the attention-psychology reason it works, and its common failure mode.
  • List hook typesEvery opening-hook technique Hookline covers.
Retention Structures2 tools
  • Retention structure infoOne whole-video retention structure's description, the attention-psychology reason it works, and its typical use.
  • List retention structuresEvery whole-video retention structure Hookline covers.
Practical Guides3 tools
  • First 3 seconds checklistA practical checklist for a short-form video's opening seconds.
  • Recommend hookSuggests fitting hook types and retention structures for a stated content goal.
  • Common mistakesFrequent hook and retention mistakes, with why each one hurts.
Glossary & Search2 tools
  • Hook glossaryDefinitions of core retention metrics and concepts: retention rate, average view duration, drop-off point, watch time, loop rate, completion rate,…
  • Search referenceKeyword search across every hook type and retention structure.

Information

PublisherUnify Dynamics LLC
CategoryDesign & creative · Everyday life
LanguagesEnglish
Built forWorldwide
CompatibilityAny MCP client · any agent · REST
Version0.1.0
MCP endpointhttps://hookline.connectorbay.com/mcp
REST APIopenapi.json
SupportGet help · Status
CountryWorldwide

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Documentation

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What Hookline is for

"Why does the curiosity-gap hook actually work?", "what's an open loop retention structure?", "best hook for a tutorial video?" — a reference that explains the mechanism behind short-form video hooks, not just a list of templates to copy.

What it does

hook_type_info explains one first-seconds hook technique — curiosity gap, bold/contrarian claim, visual pattern interrupt, direct callout, problem-agitate, in medias res, countdown tease, controversial take, relatable moment, credential stack — with a concrete example, the attention-psychology principle behind why it works, and its common failure mode (list_hook_types browses all 10). retention_structure_info explains one whole-video structure for holding attention across a full short-form video — open loop, loop/callback ending, escalating stakes, three-act micro-structure, before-after-bridge, problem-solution-proof, cliffhanger segmenting, rule-of-three reveal — the same way (list_retention_structures browses all 8). first_3_seconds_checklist gives a practical checklist for a video's opening. recommend_hook suggests fitting hooks and structures for a stated content goal. common_mistakes lists frequent hook/retention mistakes with why each one hurts. hook_glossary defines core metrics and concepts: retention rate, average view duration, drop-off point, watch time, loop rate, completion rate, hook, pattern interrupt, open loop, and the Zeigarnik effect. search_reference keyword-searches every hook type and structure at once.

What it is not

Not a guarantee of performance — audience, platform, execution and topic all still matter enormously, and no hook technique overrides weak content. Every "why it works" explanation is original synthesis grounded in named, established attention-psychology concepts (curiosity-gap theory, the Zeigarnik effect, novelty and habituation, loss aversion, source-credibility bias) rather than scraped marketing copy — it's meant to build real understanding of the mechanism, not just hand over a template to fill in.

Privacy policy

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Hookline — Privacy Policy

Effective 25 September 2026. Unify Dynamics LLC ("we", "us"), Menlo Park, California.

What Hookline is. Hookline is a connector (an MCP server and REST API) that AI assistants and personal agents call on your behalf for a hand-curated short-video hook and retention-structure reference, with original explanations of the attention-psychology principles behind each technique. You interact with your assistant; the assistant sends us only the arguments needed for that one lookup or calculation.

What we receive. The arguments of each tool call — a hook-type name, a retention-structure name, a content goal, or a search keyword — the technical headers needed to serve the request (an IP address or a client identifier supplied by the assistant, and a Pro API key if you have one), and standard server logs.

Everything is answered from bundled reference data and/or local computation, and nothing is stored. No request is forwarded to any third party — there is no upstream call at all, live or otherwise — and no query is logged in request bodies, recorded, or used to train anything.

What we do not receive or store. We do not receive your conversation with the assistant or your name, and we do not build a profile from your queries: each request is answered independently and nothing carries over between requests. Rate-limit counters (a client identifier and timestamps) are held in memory for at most 24 hours. Hosting-provider access logs, which contain IP addresses and request paths but not request bodies, are retained for up to 30 days for security and abuse prevention.

Sub-processors. None — the entire dataset is bundled with the server and answered locally. Hosting: Vercel (United States regions).

Legal bases and your rights. Our processing is necessary to provide the service you request through your assistant. Because we store no personal data beyond short-lived logs, requests to access, correct or delete personal data are usually satisfied automatically; you can still contact agent@connectorbay.com and we will respond within 30 days. We do not sell or share personal information and do not use your data to train models.

Children. Hookline is a general-audience service operated by the adult using the assistant.

Changes. We will post changes here with a new effective date.

Terms of service

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Hookline — Terms of Service

Effective 25 September 2026. These terms govern use of the Hookline connector ("the Service") operated by Unify Dynamics LLC ("we", "us").

  1. The Service. Hookline returns a hand-curated reference of short-video hook techniques and retention structures, with original psychology-grounded explanations of why each works. It is accessed through an AI assistant or directly over MCP or HTTP.
  2. Craft guidance, not a performance guarantee. Hookline explains attention-psychology principles behind common hook and retention patterns. It does not guarantee any specific video’s performance — audience, platform, topic and execution all matter, and no technique substitutes for strong content.
  3. Reference, not real-time guidance. Content reflects general, widely published practice as of the build date stated in the Service's own data or responses. It does not know your specific situation, equipment, or context, and it cannot replace judgment formed through experience or professional consultation where relevant.
  4. Acceptable use. Automated use within the published rate limits is welcome.
  5. Availability. The Service is provided "as is" without warranty. We may change, limit or discontinue it at any time.
  6. Data. Our Privacy Policy describes what we process. In short: your request is answered from bundled reference data and/or local computation, and nothing is stored.
  7. Pro keys. Optional Pro API keys are issued at our discretion, are personal to the holder and may be revoked for abuse.
  8. Liability. To the fullest extent permitted by law, Unify Dynamics LLC is not liable for any loss, injury, or damage arising from use of, or reliance on, the Service. Our total liability is limited to US $100.
  9. Governing law. California law; venue in San Mateo County, California.
  10. Contact. Unify Dynamics LLC · agent@connectorbay.com · https://connectorbay.com/hookline

Support

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Video Hooks support

Email agent@connectorbay.com. We answer within two business days.

When you report a problem, include the question you asked your agent, roughly when, and which agent you used (for example Claude, ChatGPT or Gemini). Never send us passwords, account numbers or ID numbers. Video Hooks never asks for them.

Get Video Hooks

Free · No sign-in · Read-only

Streamable HTTP, stateless, no authentication. Paste the endpoint into any MCP-capable agent.

https://hookline.connectorbay.com/mcp
{
  "mcpServers": {
    "hookline": {
      "type": "http",
      "url": "https://hookline.connectorbay.com/mcp"
    }
  }
}