Tethered Trust

com.tetheredtrust/tethered-trustVersion 0.62.4

Fit, compatibility and recall checks for AI agents before they buy: verdicts, evidence, receipts.

Status

Responds442 msNov 14, 2026, 14:18 UTCAnswered our handshake without sign-in.

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Last checked: Nov 14, 2026, 14:18 UTC
Latency: 442 ms
Remotes responding: 1 of 1
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Hosting: Hosted outside the EU (detected)
Registry data as of: Nov 14, 2026, 22:14 UTC

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Connect

Streamable HTTP

https://tetheredtrust.com/mcpResponds442 msNov 14, 2026, 14:18 UTC

No sign-in

Claude Code

claude mcp add --transport http tethered-trust https://tetheredtrust.com/mcp

Claude Desktop and claude.ai

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Settings > Connectors > Add custom connector
Name: tethered-trust
Remote MCP server URL: https://tetheredtrust.com/mcp

Cursor

{
  "mcpServers": {
    "tethered-trust": {
      "url": "https://tetheredtrust.com/mcp"
    }
  }
}

VS Code

code --add-mcp '{"name":"tethered-trust","type":"http","url":"https://tetheredtrust.com/mcp"}'

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Tools

23 tools

Tools of Tethered Trust
	Description		Read-only	Idempotent	Open world
`attach_order`Call this right after placing an order you checked with check_cart_before_checkout, validate_purchase_plan or check_compatibility: link the receipt_id to the order number, AP2 cart or intent mandate, ACP checkout session, UCP checkout or payment reference. This makes a Decision Record: if the purchase is ever disputed ("the agent bought the wrong thing"), anyone can show what was checked, from which sources, and what changed since. Free.	Call this right after placing an order you checked with check_cart_before_checkout, validate_purchase_plan or check_compatibility: link the receipt_id to the order number, AP2 cart or intent mandate, ACP checkout session, UCP checkout or payment reference. This makes a Decision Record: if the purchase is ever disputed ("the agent bought the wrong thing"), anyone can show what was checked, from which sources, and what changed since. Free.	No	No	No	No
`check_batch`Up to 25 independent compatibility checks in one call (e.g. ranking candidate products for one device). Each result has its own decision, evidence and receipt.	Up to 25 independent compatibility checks in one call (e.g. ranking candidate products for one device). Each result has its own decision, evidence and receipt.	No	Yes	No	Yes
`check_cart_before_checkout`Checks a cart at checkout. Takes the checkout session exactly as a commerce protocol returns it (a UCP checkout or an ACP CheckoutSession) or plain line items, plus what the customer already owns. Returns a decision per line item, safe_to_checkout, an action (proceed, resolve_conditions, do_not_checkout, ask_customer), questions, substitutions, a signed receipt, and a com.tetheredtrust.shopping.compatibility extension object to attach to the checkout.	Checks a cart at checkout. Takes the checkout session exactly as a commerce protocol returns it (a UCP checkout or an ACP CheckoutSession) or plain line items, plus what the customer already owns. Returns a decision per line item, safe_to_checkout, an action (proceed, resolve_conditions, do_not_checkout, ask_customer), questions, substitutions, a signed receipt, and a com.tetheredtrust.shopping.compatibility extension object to attach to the checkout.	No	Yes	No	Yes
`check_compatibility`Call this whenever you're about to recommend, link to or buy a part, accessory, charger, filter, cartridge, lens, battery, memory, mount or adapter for something the person already owns, or they ask "will X work with Y" / "is this compatible". Pass both exact models. Covers anything that has to fit, plug in, mount, run on or charge with something someone owns (list_coverage shows the verified catalog). Returns a decision (supported / conditional / incompatible / insufficient_evidence), the rules checked, caveats, required accessories, the questions to ask when it can't decide, evidence links and a signed receipt. When the text matches several models it returns each candidate's answer.	Call this whenever you're about to recommend, link to or buy a part, accessory, charger, filter, cartridge, lens, battery, memory, mount or adapter for something the person already owns, or they ask "will X work with Y" / "is this compatible". Pass both exact models. Covers anything that has to fit, plug in, mount, run on or charge with something someone owns (list_coverage shows the verified catalog). Returns a decision (supported / conditional / incompatible / insufficient_evidence), the rules checked, caveats, required accessories, the questions to ask when it can't decide, evidence links and a signed receipt. When the text matches several models it returns each candidate's answer.	No	Yes	No	Yes
`check_fit`Will this appliance physically fit this space? Compares dimensions plus typical installation clearances and required connections (power, water, gas).	Will this appliance physically fit this space? Compares dimensions plus typical installation clearances and required connections (power, water, gas).	No	Yes	Yes	No
`check_recalls`Call this before recommending, buying or selling anything used or secondhand, any baby or kids' product, appliance, heater, battery-powered device or vehicle, or when the person asks if something is safe or recalled. Searches US government recall notices: CPSC for consumer products (appliances, furniture, kids' products, electronics, tools; by brand and model or UPC) and NHTSA for vehicles (by year, make and model). Use before buying, selling or recommending something, especially used or secondhand. Returns decision (recalled / possible_recall / no_recall_found / insufficient_evidence) with each notice's hazard, remedy, which units it applies to and the official link. 'no_recall_found' is not a safety guarantee.	Call this before recommending, buying or selling anything used or secondhand, any baby or kids' product, appliance, heater, battery-powered device or vehicle, or when the person asks if something is safe or recalled. Searches US government recall notices: CPSC for consumer products (appliances, furniture, kids' products, electronics, tools; by brand and model or UPC) and NHTSA for vehicles (by year, make and model). Use before buying, selling or recommending something, especially used or secondhand. Returns decision (recalled / possible_recall / no_recall_found / insufficient_evidence) with each notice's hazard, remedy, which units it applies to and the official link. 'no_recall_found' is not a safety guarantee.	No	Yes	No	Yes
`decision_status`Call this right before acting on a watched decision: still_holds, changed (a record it rested on was updated), recall_on_record (a recall notice names one of the products), or expired, with what changed and what isn't monitored.	Call this right before acting on a watched decision: still_holds, changed (a record it rested on was updated), recall_on_record (a recall notice names one of the products), or expired, with what changed and what isn't monitored.	No	Yes	Yes	No
`dispute_packet`Call this when an agent purchase is disputed, returned as wrong, or charged back and a Tethered Trust receipt exists for it: we assemble the evidence (the decision, products checked, sources with dates, the linked order or mandate, records and recall notices that changed since, reported outcomes, and signature verification) into one printable page and JSON anyone can verify. For merchants, platforms and buyers. $1.50 per packet.	Call this when an agent purchase is disputed, returned as wrong, or charged back and a Tethered Trust receipt exists for it: we assemble the evidence (the decision, products checked, sources with dates, the linked order or mandate, records and recall notices that changed since, reported outcomes, and signature verification) into one printable page and JSON anyone can verify. For merchants, platforms and buyers. $1.50 per packet.	No	Yes	Yes	No
`file_claim`Call this when a product we said would work didn't (within 60 days of the check): send the receipt_id and what happened. Decided within 10 business days; if our answer or data was wrong, the fee paid for that check is refunded and the data corrected. Free. For a plain fit/no-fit report without a claim, use report_outcome.	Call this when a product we said would work didn't (within 60 days of the check): send the receipt_id and what happened. Decided within 10 business days; if our answer or data was wrong, the fee paid for that check is refunded and the data corrected. Free. For a plain fit/no-fit report without a claim, use report_outcome.	No	No	No	No
`find_parts`Call this when the person names a device or appliance they own and needs a replacement or add-on ("what filter does my fridge take", "which RAM can I add", "what battery fits my drill") before you search shops or guess. Which parts and accessories fit this model? OEM parts first, then verified alternatives: e.g. a refrigerator's water filter, a printer's cartridges, a camera's lenses and batteries, a tool's batteries, or the RAM, SSDs and chargers that fit a computer.	Call this when the person names a device or appliance they own and needs a replacement or add-on ("what filter does my fridge take", "which RAM can I add", "what battery fits my drill") before you search shops or guess. Which parts and accessories fit this model? OEM parts first, then verified alternatives: e.g. a refrigerator's water filter, a printer's cartridges, a camera's lenses and batteries, a tool's batteries, or the RAM, SSDs and chargers that fit a computer.	No	Yes	Yes	No
`fix_purchase_plan`When a plan comes back incompatible or conditional: the smallest set of changes that makes it work (swap a part for a verified one that fits everything else, add a missing cooler, hub or adapter, trim quantities that exceed slots), re-validated, with the reason for each change. Fewest changes and verified products first; no prices.	When a plan comes back incompatible or conditional: the smallest set of changes that makes it work (swap a part for a verified one that fits everything else, add a missing cooler, hub or adapter, trim quantities that exceed slots), re-validated, with the reason for each change. Fewest changes and verified products first; no prices.	No	Yes	No	Yes
`how_it_works`What Tethered Trust is, what it covers, where its data comes from, pricing and terms.	What Tethered Trust is, what it covers, where its data comes from, pricing and terms.	No	Yes	Yes	No
`identify_from_photo`Read the brand, model and part numbers from a photo of a label or nameplate and match them to products. Matches are returned as candidates, with what was read. The photo isn't stored.	Read the brand, model and part numbers from a photo of a label or nameplate and match them to products. Matches are returned as candidates, with what was read. The photo isn't stored.	No	Yes	No	Yes
`identify_product`Call this when the person gives a shop link, ASIN, barcode or vague product name and you need the exact model and what it's compatible with. Identify a product from a URL, model number, SKU, ASIN, UPC/EAN or description, and get its compatibility profile: the standards it takes and provides (mounts, sockets, connectors, platforms, part numbers, sizes), numeric limits (OS version, watts, weight, screen size), evidence and freshness. Products not in our reviewed catalog are researched on demand from the manufacturer's page and returned with status read_from_manufacturer_page (unreviewed) or unconfirmed (not enough to decide on). Use first when the product could be anything.	Call this when the person gives a shop link, ASIN, barcode or vague product name and you need the exact model and what it's compatible with. Identify a product from a URL, model number, SKU, ASIN, UPC/EAN or description, and get its compatibility profile: the standards it takes and provides (mounts, sockets, connectors, platforms, part numbers, sizes), numeric limits (OS version, watts, weight, screen size), evidence and freshness. Products not in our reviewed catalog are researched on demand from the manufacturer's page and returned with status read_from_manufacturer_page (unreviewed) or unconfirmed (not enough to decide on). Use first when the product could be anything.	No	Yes	No	Yes
`list_coverage`Which product categories and models are in the compatibility graph, with counts. Pass a category to list its models. Covers anything that has to fit, plug in, mount, run on or charge with something someone owns. Verified catalog (specs checked against cited manufacturer sources): computers & consoles (RAM, M.2 SSDs, USB-C chargers), phones/tablets/watches (USB-C PD, MagSafe, Qi2, watch bands), cameras (lens mounts, adapters, batteries, memory cards), cordless power tools (battery platforms), printers (ink, toner, drums), appliances (refrigerator water and air filters, dryer vents and power cords, installation fit), vacuums (bags, filters, batteries, robot-vacuum parts), air quality (purifier filters, HVAC media, humidifier pads), e-bikes (batteries and chargers by drive system), smart home (Matter, Thread, Zigbee, hubs, bulb bases), PC building (CPU sockets, cooler mounts, memory, clearances, power), cars & EV charging (tire sizes by trim, NACS/J1772/CCS1 and approved adapters, home chargers; a starter set of models) and TVs, consoles & streaming (VESA mounts, weight and screen size, console generations, app platforms). Products outside the catalog in any category are read by AI in terms of the same standards and returned as unverified.	Which product categories and models are in the compatibility graph, with counts. Pass a category to list its models. Covers anything that has to fit, plug in, mount, run on or charge with something someone owns. Verified catalog (specs checked against cited manufacturer sources): computers & consoles (RAM, M.2 SSDs, USB-C chargers), phones/tablets/watches (USB-C PD, MagSafe, Qi2, watch bands), cameras (lens mounts, adapters, batteries, memory cards), cordless power tools (battery platforms), printers (ink, toner, drums), appliances (refrigerator water and air filters, dryer vents and power cords, installation fit), vacuums (bags, filters, batteries, robot-vacuum parts), air quality (purifier filters, HVAC media, humidifier pads), e-bikes (batteries and chargers by drive system), smart home (Matter, Thread, Zigbee, hubs, bulb bases), PC building (CPU sockets, cooler mounts, memory, clearances, power), cars & EV charging (tire sizes by trim, NACS/J1772/CCS1 and approved adapters, home chargers; a starter set of models) and TVs, consoles & streaming (VESA mounts, weight and screen size, console generations, app platforms). Products outside the catalog in any category are read by AI in terms of the same standards and returned as unverified.	No	Yes	Yes	No
`list_standards`Call this before sending products described by their specs instead of model numbers (e.g. specs_from or a custom product), or to map your own catalog fields onto ours: returns every standard family with its reviewed values (lens mounts, battery platforms, memory types, connectors, filters), the formats for new values and the numeric limit keys. Not needed for normal checks with model numbers. Free, read-only.	Call this before sending products described by their specs instead of model numbers (e.g. specs_from or a custom product), or to map your own catalog fields onto ours: returns every standard family with its reviewed values (lens mounts, battery platforms, memory types, connectors, filters), the formats for new values and the numeric limit keys. Not needed for normal checks with model numbers. Free, read-only.	No	Yes	Yes	No
`plan_upgrade`Call this when the person asks what they can upgrade or add to a device they own ("can I add more RAM to my laptop", "what SSD does my PC take", "what GPU fits my case") before suggesting parts: returns memory type, slots and maximum, M.2 slots, lengths and PCIe generation, power, CPU and cooler support for motherboards, GPU and cooler clearance for cases, the parts in our graph that fit (verified first) and the manufacturer's notes. Pass the exact model.	Call this when the person asks what they can upgrade or add to a device they own ("can I add more RAM to my laptop", "what SSD does my PC take", "what GPU fits my case") before suggesting parts: returns memory type, slots and maximum, M.2 slots, lengths and PCIe generation, power, CPU and cooler support for motherboards, GPU and cooler clearance for cases, the parts in our graph that fit (verified first) and the manufacturer's notes. Pass the exact model.	No	Yes	No	Yes
`recheck_plan`Re-run a saved purchase plan against today's data before ordering, and see what changed since it was issued: decisions, product records, or receipt status.	Re-run a saved purchase plan against today's data before ordering, and see what changed since it was issued: decisions, product records, or receipt status.	No	Yes	No	Yes
`report_outcome`After a purchase, report whether it actually fit. Free, safe to call, and only the first report per check counts. Reports are weighted by level: self_reported (website), agent_reported (anonymous API/MCP), partner_reported (API key holders) and order_confirmed (order evidence we've confirmed). Only the last two can raise future confidence.	After a purchase, report whether it actually fit. Free, safe to call, and only the first report per check counts. Reports are weighted by level: self_reported (website), agent_reported (anonymous API/MCP), partner_reported (API key holders) and order_confirmed (order evidence we've confirmed). Only the last two can raise future confidence.	No	No	Yes	No
`resolve_product`Call this to confirm exactly which model the person means before checking or buying ("which Galaxy S25 is this?") or to read a product's structured specs: looks it up by name or model number and returns its specs, what it accepts (mounts, battery platforms, cartridges, protocols) and what it fits. When the text matches several models it returns them all as candidates (ambiguous: true) so you can ask the person which one. For a yes/no fit answer use check_compatibility instead.	Call this to confirm exactly which model the person means before checking or buying ("which Galaxy S25 is this?") or to read a product's structured specs: looks it up by name or model number and returns its specs, what it accepts (mounts, battery platforms, cartridges, protocols) and what it fits. When the text matches several models it returns them all as candidates (ambiguous: true) so you can ask the person which one. For a yes/no fit answer use check_compatibility instead.	No	Yes	Yes	No
`validate_purchase_plan`Call this before you recommend or order two or more items that have to work together or with what the person owns (a PC build or upgrade, a camera kit, a smart-home setup, a charger plus cable). Check a whole purchase before recommending or ordering it: the setup the person owns (with current configuration) plus everything in the cart. Returns one decision (supported / conditional / incompatible / insufficient_evidence), a result per part, configuration limits across the plan (memory slots and capacity, M.2 slots), adapters or hubs still needed, substitutions for parts that won't work, the exact questions blocking a decision, evidence, and a signed receipt. Covers anything that has to fit, plug in, mount, run on or charge with something someone owns. Verified catalog (specs checked against cited manufacturer sources): computers & consoles (RAM, M.2 SSDs, USB-C chargers), phones/tablets/watches (USB-C PD, MagSafe, Qi2, watch bands), cameras (lens mounts, adapters, batteries, memory cards), cordless power tools (battery platforms), printers (ink, toner, drums), appliances (refrigerator water and air filters, dryer vents and power cords, installation fit), vacuums (bags, filters, batteries, robot-vacuum parts), air quality (purifier filters, HVAC media, humidifier pads), e-bikes (batteries and chargers by drive system), smart home (Matter, Thread, Zigbee, hubs, bulb bases), PC building (CPU sockets, cooler mounts, memory, clearances, power), cars & EV charging (tire sizes by trim, NACS/J1772/CCS1 and approved adapters, home chargers; a starter set of models) and TVs, consoles & streaming (VESA mounts, weight and screen size, console generations, app platforms). Products outside the catalog in any category are read by AI in terms of the same standards and returned as unverified.	Call this before you recommend or order two or more items that have to work together or with what the person owns (a PC build or upgrade, a camera kit, a smart-home setup, a charger plus cable). Check a whole purchase before recommending or ordering it: the setup the person owns (with current configuration) plus everything in the cart. Returns one decision (supported / conditional / incompatible / insufficient_evidence), a result per part, configuration limits across the plan (memory slots and capacity, M.2 slots), adapters or hubs still needed, substitutions for parts that won't work, the exact questions blocking a decision, evidence, and a signed receipt. Covers anything that has to fit, plug in, mount, run on or charge with something someone owns. Verified catalog (specs checked against cited manufacturer sources): computers & consoles (RAM, M.2 SSDs, USB-C chargers), phones/tablets/watches (USB-C PD, MagSafe, Qi2, watch bands), cameras (lens mounts, adapters, batteries, memory cards), cordless power tools (battery platforms), printers (ink, toner, drums), appliances (refrigerator water and air filters, dryer vents and power cords, installation fit), vacuums (bags, filters, batteries, robot-vacuum parts), air quality (purifier filters, HVAC media, humidifier pads), e-bikes (batteries and chargers by drive system), smart home (Matter, Thread, Zigbee, hubs, bulb bases), PC building (CPU sockets, cooler mounts, memory, clearances, power), cars & EV charging (tire sizes by trim, NACS/J1772/CCS1 and approved adapters, home chargers; a starter set of models) and TVs, consoles & streaming (VESA mounts, weight and screen size, console generations, app platforms). Products outside the catalog in any category are read by AI in terms of the same standards and returned as unverified.	No	Yes	No	Yes
`verify_receipt`Check a Tethered Trust receipt: is the signature ours, is it still within valid_until, and have the records behind it changed since? A valid receipt proves what we said and when; it doesn't guarantee the verdict was right.	Check a Tethered Trust receipt: is the signature ours, is it still within valid_until, and have the records behind it changed since? A valid receipt proves what we said and when; it doesn't guarantee the verdict was right.	No	Yes	Yes	No
`watch_decision`Call this after a compatibility check, purchase plan, verify_page or verify_mcp result that someone will rely on later (an order next week, an install, a resale, the next agent in a handoff). For product decisions we watch the records, manufacturer sources and US recall notices behind it; for page and MCP checks we re-run the same checks daily. Watches last 30 days and need only the receipt_id. Free during early access.	Call this after a compatibility check, purchase plan, verify_page or verify_mcp result that someone will rely on later (an order next week, an install, a resale, the next agent in a handoff). For product decisions we watch the records, manufacturer sources and US recall notices behind it; for page and MCP checks we re-run the same checks daily. Watches last 30 days and need only the receipt_id. Free during early access.	No	No	Yes	No

Details

Registry status: Active
Published: Nov 13, 2026
Updated: Nov 13, 2026
Website: https://tetheredtrust.com/⁠ (opens in a new tab)
Repository: Not given
Categories (suggested): E-commerceSuggested categories are assigned automatically from the registry text and may be wrong. Verified operators can correct them.
GDPR: Not declared

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