Tethered Trust
Compatibility checks for AI agents before they buy or install: verdicts, evidence, receipts.
| Endpoint | https://tetheredtrust.com/mcp (streamable-http) |
|---|---|
| Registry version | 0.12.0 |
| Now | 18 tools · grade D (63) · pin ts_1a0f0283826a322cd20e0331e83abce4 · protocol 2025-06-18 |
| First / last listed | 2026-10-26 07:55 UTC / 2026-10-26 07:55 UTC |
| Grade over time | 2026-10-26: D (63), 18 tools |
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Tools: how_it_works list_coverage check_cart_before_checkout enrich_catalog identify_product list_standards resolve_product validate_purchase_plan fix_purchase_plan plan_upgrade identify_from_photo recheck_plan check_batch check_compatibility find_parts check_fit verify_receipt report_outcome
how_it_works | What Tethered Trust is, what it covers, where its data comes from, pricing and terms. params: none |
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), cam params: category |
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.co params: checkout, line_items, products, owned |
enrich_catalog | For retailers and marketplaces (API key required): up to 50 products per call (SKU with title, URL or GTIN) in; each product's compatibility attributes out (standards it takes and provides, numeric limits, evidence level, freshness), ready to add to a product feed or UCP catalog so agents can match it to what shoppers own. params: items*, research |
identify_product | 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 w params: product*, role, research |
list_standards | Every compatibility standard family (with reviewed values), the open formats used for new values, and the numeric limit keys. How Tethered Trust represents physical connections, dimensional fit, vehicles, software and services. params: none |
resolve_product | Look up one product in the Tethered Trust graph by name or model number and get its structured specs, what it accepts (mounts, battery platforms, cartridges, protocols) and what it fits. If the text could mean several models, returns them all as candidates (ambiguous: true) with ambiguous: true. params: query* |
validate_purchase_plan | 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, th params: goal, setup, purchase* |
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. params: goal, setup, purchase* |
plan_upgrade | What can be upgraded on this device and with what: memory (type, slots, maximum), storage (M.2 slots, lengths, PCIe generation), power, CPU and cooling for motherboards, graphics card and cooler clearance for PC cases, plus the parts in our graph that fit (verified first) and the manufacturer's notes. params: model, id, goal |
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. params: image*, hint |
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. params: plan_id* |
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. params: checks* |
check_compatibility | Will this exact part or accessory work with that exact device? Use before recommending or buying. 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, params: existing*, candidate*, detail, existing_id, candidate_id |
find_parts | 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. params: model*, part_type |
check_fit | Will this appliance physically fit this space? Compares dimensions plus typical installation clearances and required connections (power, water, gas). params: product, category, product_dimensions, opening*, needs, has |
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. params: receipt_id, jws |
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. params: check_id*, outcome*, note, evidence |
Entries describe changes in tool definitions. They are not statements about a server, its quality or its author. The grade measures how the tool definitions fit model providers (token cost, schema compatibility, confusable names) as scored by the ToolFit engine at the time of the listing. JSON: append .json. Opt-out: how or hello@youraitools.co.