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Langexchange

CEFR-calibrated conversation prompts for language exchange, from A1 to C2

Unify Dynamics LLC

Documentation
Tools5read-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.

What CEFR levels do you cover?
Tools called
list_levels
What can a B1 learner actually do?
Tools called
cefr_reference
Show me all the B2 opinion prompts
Tools called
topic_bank
Give me an A2 conversation starter
Tools called
conversation_prompt
Give me 5 conversation prompts for a C1 language exchange
Tools called
practice_session

About

Langexchange is a fully local CEFR-calibrated (A1-C2) language-exchange conversation-prompt generator. list_levels lists the six CEFR levels with their typical grammar focus. cefr_reference gives the can-do quick-reference for one level or all six, paraphrased from the Council of Europe's published CEFR global scale. topic_bank browses the hand-authored prompt bank by level and/or category (daily_life, opinions, hypotheticals). conversation_prompt returns one level-appropriate conversation starter. practice_session bundles several prompts across mixed categories into one practice set. Keyless; fully local; zero upstream calls; nothing stored.

Sources: Computed locally / hand-curated — conversation prompts hand-authored and calibrated to CEFR grammar levels; CEFR can-do descriptors paraphrased from the Council of Europe's published CEFR global scale; 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

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

OpenAPI
CEFR reference2 tools
  • List levelsThe six CEFR levels (A1-C2) with their typical grammar focus.
  • Cefr referenceThe CEFR can-do quick-reference for one level, or all six — what a learner at that level can typically do, paraphrased from the Council of…
Prompts3 tools
  • Topic bankBrowses the hand-authored conversation-prompt bank by level and/or category, without picking one.
  • Conversation promptOne level-appropriate conversation-starter prompt, calibrated to that CEFR level's typical grammar and vocabulary complexity.
  • Practice sessionSeveral conversation prompts across mixed categories for one CEFR level, bundled as a practice set.

Information

PublisherUnify Dynamics LLC
CategoryCulture & language
LanguagesEnglish
Built forGlobal
CompatibilityAny MCP client · any agent · REST
Version0.1.0
MCP endpointhttps://langexchange.connectorbay.com/mcp
REST APIopenapi.json
SupportGet help · Status
CountryWorldwide

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Documentation

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What Langexchange is for

"Give me an A2 conversation starter", "what can a B1 learner actually do, per the CEFR scale?", "give me 5 conversation prompts for a C1 language exchange" — a fully local conversation-prompt generator for language exchange and self-study, calibrated to the six CEFR proficiency levels (A1 through C2).

What it does

list_levels lists the six CEFR levels with their typical grammar focus. cefr_reference gives the full can-do quick-reference for one level, or all six — a paraphrase of the Council of Europe's own CEFR global scale, not an invented substitute. topic_bank lets you browse the hand-authored prompt bank by level and/or category (daily life, opinions, hypotheticals) without picking one. conversation_prompt returns a single level-appropriate conversation starter, and practice_session bundles several prompts across mixed categories into one practice set for a level.

How prompts are calibrated

Every prompt is hand-authored, not machine-translated or generated from a fill-in-the-blank template, and the complexity is deliberately scaled to match each level's real grammar range: A1 prompts use simple present-tense personal questions ("Do you like coffee or tea?"); A2 introduces simple past and "going to" future ("What did you do last weekend?"); B1 asks for connected narrative and simple reasons ("What's a hobby you've picked up in the last year, and why?"); B2 moves into structured argument with advantages and disadvantages; C1 uses nuanced hedging and implicit-assumption language; and C2 engages directly with abstraction, contested ideas, and fine distinctions of meaning.

What is hand-authored vs. paraphrased from a published source

Every conversation prompt in the topic bank is hand-authored for this connector. The CEFR can-do descriptors in cefr_reference are honest paraphrases of the Council of Europe's published CEFR global scale of proficiency levels — summarized, not invented or exaggerated.

What it is not

This is a conversation-practice and reference tool, not a certified CEFR placement test. Use cefr_reference as a quick-reference summary of what each level typically covers, not as a substitute for a formal proficiency assessment.

Built and maintained by Unify Dynamics LLC. Contact: agent@connectorbay.com.

Privacy policy

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Langexchange — Privacy Policy

Effective 28 September 2026. Unify Dynamics LLC ("we", "us"), Menlo Park, California.

What Langexchange is. Langexchange is a connector (an MCP server and REST API) that AI assistants and personal agents call on your behalf for CEFR-calibrated language-exchange conversation prompts and a CEFR quick-reference. You interact with your assistant; the assistant sends us only the values needed for that one response.

What we receive. The arguments of each tool call — a CEFR level, an optional topic category, and how many prompts to return — 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 locally and nothing is stored. Every conversation prompt and CEFR descriptor is read from a bundled, hand-authored reference file; only which prompt(s) to return is selected at request time. No request is forwarded to any third party, 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, your name, or any other identifying information, and we do not build a learning profile from your queries — each call is answered independently.

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 — every tool is answered locally. Hosting: Vercel (United States regions).

Legal bases and your rights. For users in California, the EU/UK and elsewhere, 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. Langexchange is a general-audience language-learning reference operated through the adult or organization running the AI assistant.

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

Terms of service

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Langexchange — Terms of Service

Effective 28 September 2026. These terms govern use of the Langexchange connector ("the Service") operated by Unify Dynamics LLC ("we", "us").

  1. The Service. Langexchange returns CEFR-calibrated (A1-C2) language-exchange conversation prompts and a CEFR can-do quick-reference, from a hand-authored reference bundled with the server. It is accessed through an AI assistant or directly over MCP or HTTP.
  2. Reference and practice content, not a certification. Langexchange's CEFR descriptors are a paraphrased quick-reference summary, not a certified proficiency assessment, and its conversation prompts are general practice material, not a structured curriculum or a substitute for a qualified language instructor.
  3. Randomly selected content. Which prompt or prompts are returned for a given request is selected at request time and is not guaranteed to be unique or non-repeating across calls.
  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 on our server 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 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/langexchange

Support

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Langexchange 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. Langexchange never asks for them.

Get Langexchange

Free · No sign-in · Read-only

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

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