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Catalog of 370+ open-source AI-agent harnesses. Search, list your own, earn USDC tips via x402.

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Status
Healthy
Uptime
100.0% over 72 days
Last Tested
Transport
Streamable HTTP · MCP 2025-11-25
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TDQS

A4.3/5.0

Scored across 6 tools

Disambiguation4/5

The catalog tools (list_domains, search_harnesses, get_harness) and submit_harness target clearly distinct operations, so misselection is unlikely. The only real overlap is support_loadbay vs tip_harness, which share the same x402 payment mechanism and differ only by recipient; the 'Only when...' phrasing mitigates but does not eliminate this.

Naming Consistency5/5

All six tools follow a consistent snake_case verb_noun pattern (get_harness, list_domains, search_harnesses, submit_harness, tip_harness, support_loadbay). The convention is predictable and readable throughout.

Tool Count5/5

Six tools is well-scoped for a catalog browse/search/submit/tip server. Each tool corresponds to a distinct user intent (browse, search, detail, submit, tip author, support builder) and none feels redundant filler.

Completeness4/5

The surface covers the core lifecycle: browse by domain, search, fetch details, submit, and pay. Minor gaps remain — a submitter cannot update or remove their own listing, and there is no status/verification lookup — but agents can work around these.

Available Tools

6 tools
get_harnessGet harness detailsA
Read-onlyIdempotent
Inspect

Get full details for one harness in the Loadbay catalog by slug (from search_harnesses): repo, license, stars, language, integrations, traits, summary and a shareable loadbay.xyz page. If the slug is unknown it returns the closest matches.

NameRequiredDescriptionDefault
slugYesthe harness slug, e.g. browser-use

TDQS

A4.2/5.0
Behavior4/5

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

Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description adds genuinely new behavioral context beyond the annotations: the unknown-slug fallback that returns nearest matches instead of erroring, plus the fact that a shareable loadbay.xyz page is produced.

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?

A single front-loaded sentence that names the action, the identifier, its source, the returned fields, and the edge-case behavior. Every clause carries information and nothing is repeated from the schema or annotations.

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?

With no output schema, the description reasonably compensates by listing the fields returned, and it covers the error/fallback path. Minor gaps remain (e.g., whether the page URL is always generated, any rate limits), but an agent has what it needs to call this correctly.

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

Parameters3/5

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

Schema coverage is 100% for the single 'slug' parameter, so the schema already documents the input. The description adds only provenance ('from search_harnesses') and an inline example is already present in the schema, so the baseline of 3 is appropriate.

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?

States a specific verb and resource ('Get full details for one harness in the Loadbay catalog by slug') and enumerates the returned surface (repo, license, stars, language, integrations, traits, summary, shareable page). It also distinguishes itself from the sibling search_harnesses, which is named as the source of the slug.

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?

It clearly positions the tool downstream of search_harnesses ('slug (from search_harnesses)') and documents the fallback path when the slug is unknown ('returns the closest matches'), which tells the agent the call will not simply fail. It stops short of explicit when-not-to-use guidance, but the usage context is unambiguous.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

list_domainsList harness domainsA
Read-onlyIdempotent
Inspect

List the domains (categories) in the Loadbay catalog with how many harnesses each holds. Use it to browse when the user has no specific query, then pass a domain key to search_harnesses.

NameRequiredDescriptionDefault

No parameters

TDQS

A4.7/5.0
Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and closed-world scope, so safety is covered. The description adds the meaningful non-structured fact that each entry carries a harness count, which matters because there is no output schema. It stops short of describing ordering or whether the full catalog is always returned.

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?

Two sentences with no filler; the what-it-returns statement and the routing/next-step guidance are both front-loaded. Every clause earns its place.

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

Completeness5/5

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

With no input parameters, no output schema and full annotation coverage, the description carries exactly the missing pieces: what the list contains (domains plus counts) and how to continue into search_harnesses. Nothing an agent needs to call it correctly is absent.

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

Parameters4/5

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

The tool takes zero parameters, so the schema has nothing to document and the baseline is 4. The description correctly introduces no phantom inputs and instead explains how the returned domain key is consumed downstream.

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?

Specific verb+resource ('List the domains (categories) in the Loadbay catalog') plus the shape of the result ('how many harnesses each holds'). It also distinguishes itself from search_harnesses by naming the relationship, so an agent can tell the two apart without opening a schema.

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

Usage Guidelines5/5

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

Explicit routing condition: use it 'to browse when the user has no specific query', implicitly excluding the query case and directing it to search_harnesses. It also names the follow-up step ('pass a domain key to search_harnesses'), so the browse-to-search workflow is unambiguous.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

search_harnessesFind agent harnesses / MCP serversA
Read-onlyIdempotent
Inspect

Find an existing MCP server, SDK or agent framework that connects an AI agent to a service or does a task, from Loadbay's curated catalog. Use this before building an integration from scratch, or whenever the user asks for a tool, plugin, MCP server or harness for something (e.g. "MCP server for Postgres", "browser automation for agents", "crypto trading bot framework", "Slack integration"). Returns matches ranked by relevance then GitHub stars, each with repo URL, license, language, integrations and traits. All filters are optional; with none it returns the most-starred harnesses.

NameRequiredDescriptionDefault
limitNomax results, default 10
queryNowhat the agent needs to do or connect to, in plain words, e.g. "postgres", "stripe payments", "web scraping"
traitNorequire a trait: mcp = exposes an MCP server, oss = open source, keys = needs API keys, sandbox = runs sandboxed, guard = has guardrails
domainNorestrict to one domain: trading (Trading), coding (Coding & DevOps), browser (Browser & computer), productivity (Productivity), data (Data & search), social (Social & comms), health (Health), science (Research & science), gaming (Gaming), media (Voice & media), robotics (Robotics)
integrationNorequire a named integration, e.g. "GitHub", "Coinbase", "Slack" (case-insensitive)

TDQS

A4.4/5.0
Behavior4/5

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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), and the description adds genuine behavior beyond that: result ranking (relevance then GitHub stars), the returned fields (repo URL, license, language, integrations, traits), and the no-filter default (most-starred harnesses). It does not cover edge cases such as empty results or pagination beyond the limit param, so it falls short of a 5.

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

Conciseness4/5

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

Purpose is front-loaded in the first sentence, with usage, return shape, and default behavior following in a logical order. The parenthetical example list is longer than strictly necessary but earns its place for query-matching, so only minor trimming is possible.

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

Completeness5/5

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

With no output schema, the description compensates by describing ranking order and returned fields, and it explains the zero-filter default behavior. Combined with full schema coverage and covering annotations, an agent has everything needed to invoke this correctly.

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

Parameters3/5

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

Schema description coverage is 100% and every parameter (query, trait, domain, integration, limit) is documented inline with examples and enum meanings. The description's param-level content ('All filters are optional') largely echoes the schema, so the baseline 3 applies.

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?

States a concrete verb+resource (find MCP servers / SDKs / agent frameworks) and pinpoints the catalog source (Loadbay's curated catalog). It is clearly separable from siblings like get_harness (single fetch) and submit_harness (write), so an agent can route correctly without opening the schema.

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

Usage Guidelines5/5

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

Explicitly states when to use it ('before building an integration from scratch, or whenever the user asks for a tool, plugin, MCP server or harness') and supplies concrete trigger phrasings ('MCP server for Postgres', 'browser automation for agents'). This is actionable routing guidance, not just context.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

submit_harnessSubmit a harness to LoadbayAInspect

List a new harness on Loadbay. The repo MUST be a public, open-source GitHub repository. Optionally include a USDC address to receive tips — it must also appear in the repo's loadbay.json, .github/FUNDING.yml or README.md (proof of ownership). The listing appears immediately, tagged as community-added (unverified).

NameRequiredDescriptionDefault
nameYesharness name, e.g. my-coinbase-harness
repoYespublic GitHub repo URL — must be open source (have a license)
authorNoyour GitHub handle (defaults to the repo owner)
domainYesdomain key, one of: trading | coding | browser | productivity | data | social | health | science | gaming | media | robotics
traitsNocapability traits
summaryYeswhat it connects to, what tools it exposes, how an agent uses it
languageNoprimary language, e.g. TypeScript
integrationsNowhat it connects to, e.g. ["Coinbase","Slack"]
solanaAddressNoSolana wallet (base58) to receive USDC (SPL) tips — optional, alongside or instead of Base
baseUsdcAddressNoBase USDC wallet (0x…) to receive tips — must also appear in the repo's loadbay.json, .github/FUNDING.yml or README.md

TDQS

A4/5.0
Behavior4/5

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

Annotations already declare readOnlyHint=false, idempotentHint=false and openWorldHint=true, so the write profile is covered. The description adds genuinely new behavioral facts: the listing publishes immediately, it is tagged community-added (unverified), and tip addresses require proof of ownership in the repo. It still does not say whether duplicate submissions are rejected or whether a listing can be withdrawn.

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?

Three sentences, purpose front-loaded, zero filler. Each sentence carries a distinct load: what it does, the hard repo requirement, the optional tip-address rule plus listing outcome.

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?

For a 10-parameter write tool with no output schema, the description covers the critical constraints (public OSS repo, ownership proof, immediate unverified listing) and the safety profile comes from annotations. The remaining gap is the result of a successful submit — no output schema exists, and the description never says what the agent gets back or how to reference the new listing afterwards.

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

Parameters3/5

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

Schema description coverage is 100% and the schema already documents the license requirement for repo and the loadbay.json/FUNDING.yml/README proof rule for baseUsdcAddress, so the description largely restates structured data. It also introduces a small ambiguity by referring to "a USDC address" without distinguishing baseUsdcAddress from solanaAddress, whose schema semantics differ.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description opens with a specific verb+resource: "List a new harness on Loadbay," which is unambiguous and clearly distinct from read-only siblings like get_harness and search_harnesses. It does not, however, explicitly distinguish itself from tip_harness or support_loadbay, which also involve USDC wallet handling and could be conflated with this submission flow.

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?

It gives concrete preconditions for use: the repo MUST be public and open-source, and any tip address must be verifiable in the repo. That routing context is strong. It stops short of stating when NOT to use it (e.g., there is no update/edit path for an existing listing) or naming an alternative flow.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

support_loadbaySupport Loadbay (x402)A
Read-onlyIdempotent
Inspect

Only when the user asks to support or donate to Loadbay. Support the Loadbay builder with a USDC tip over x402. Returns the payable endpoint — GET it with your own x402 wallet to send the tip. Loadbay never holds funds; your wallet is the payer.

NameRequiredDescriptionDefault
amountNotip amount in USD (default 5); the builder receives USDC

TDQS

A4.3/5.0
Behavior5/5

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

Although annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, the description explains why a payment tool is read-only: it only 'Returns the payable endpoint,' the agent must GET it with its own x402 wallet, 'Loadbay never holds funds,' and 'your wallet is the payer.' That custody/authorization model is real context the annotations cannot convey and resolves the apparent tension between 'tip' and readOnlyHint.

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?

Three tight sentences with the precondition front-loaded, then the mechanism, then the custody/security note. Every sentence carries load: trigger, return shape, and who pays. No filler.

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

Completeness5/5

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

With no output schema, the description supplies what an agent needs: the call returns a payable endpoint, the next step is a GET from the agent's own x402 wallet, and no custody risk exists. For a one-parameter, low-complexity tool this is complete.

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

Parameters3/5

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

The single 'amount' parameter has 100% schema description coverage ('tip amount in USD (default 5)'), so the baseline is 3. The description adds only that the payment is a 'USDC tip,' reinforcing the currency from the schema but adding no new sizing, formatting, or constraint guidance.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description names a specific verb + resource: 'Support the Loadbay builder with a USDC tip over x402.' That is far more concrete than the tool name 'support_loadbay' alone. It stops short of explicitly contrasting itself with the sibling 'tip_harness' (tipping a harness vs. tipping the Loadbay builder), leaving that distinction to be inferred.

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?

It opens with an explicit trigger condition and restriction: 'Only when the user asks to support or donate to Loadbay,' which tells the agent both when to use it and when not to. It also explains the follow-up action (GET the endpoint with your own x402 wallet). It does not name the closest alternative (tip_harness) for routing decisions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

tip_harnessTip a harness author (x402)A
Read-onlyIdempotent
Inspect

Only when the user asks to tip or pay a harness author. Tip in USDC over x402. Returns the payable endpoint and its payment details — GET it with an x402-capable client/wallet to actually send the tip (the agent's own wallet pays; Loadbay never holds funds).

NameRequiredDescriptionDefault
slugYesthe harness slug to tip
amountNotip amount in USD (default 1); the author receives USDC

TDQS

A4.5/5.0
Behavior5/5

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

With readOnlyHint/idempotentHint already declaring the safety profile, the description still adds the crucial behavioral fact that this tool does not move money itself: it returns a payable endpoint, the agent's own wallet pays, and Loadbay never holds funds. That two-step flow is exactly the context an agent needs and is not derivable from annotations or schema.

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?

Three sentences, no waste, and the gating condition is front-loaded before the mechanics. Each sentence carries distinct information: when to use, what it does, and how the payment actually executes.

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

Completeness5/5

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

No output schema exists, so the description compensates by explaining the return value (payable endpoint plus payment details). Combined with full parameter coverage and the custody disclaimer, an agent has everything needed to call it and interpret the result.

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

Parameters3/5

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

Schema coverage is 100%, so both parameters are already documented (including the USD default of 1 and USDC settlement). The description adds only the 'USDC over x402' framing, which largely restates the schema, so the baseline 3 applies.

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?

States a specific verb (tip) and resource (harness author), and the 'x402'/USDC payment rail further pins down the operation. The phrase 'harness author' implicitly separates it from support_loadbay, which targets Loadbay itself, so an agent can route correctly.

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?

'Only when the user asks to tip or pay a harness author' is an explicit use condition that prevents unprompted invocation. It does not name support_loadbay as the sibling alternative for other payment intents, leaving that routing to inference.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

  1. 1 tool update
    • Changedsearch_harnesses9 fields changed
      • changedInput schema / properties / domain / description
        Previous value: -"domain key: trading | coding | browser | productivity | data | social | health | science | gaming | media | robotics"New value: +"restrict to one domain: trading (Trading), coding (Coding & DevOps), browser (Browser & computer), productivity (Productivity), data (Data & search), social (Social & comms), health (Health), science (Research & science), gaming (Gaming), media (Voice & media), robotics (Robotics)"
      • addedInput schema / properties / domain / enum
        Added value: +[
        +  "trading",
        +  "coding",
        +  "browser",
        +  "productivity",
        +  "data",
        +  "social",
        +  "health",
        +  "science",
        +  "gaming",
        +  "media",
        +  "robotics"
        +]
      • addedInput schema / properties / integration
        Added value: +{
        +  "description": "require a named integration, e.g. \"GitHub\", \"Coinbase\", \"Slack\" (case-insensitive)",
        +  "type": "string"
        +}
      • changedInput schema / properties / limit / description
        Previous value: -"max results, default 20"New value: +"max results, default 10"
      • addedInput schema / properties / limit / maximum
        Added value: +50
      • addedInput schema / properties / limit / minimum
        Added value: +1
      • changedInput schema / properties / limit / type
        Previous value: -"number"New value: +"integer"
      • changedInput schema / properties / query / description
        Previous value: -"free-text over name, author, summary, integrations"New value: +"what the agent needs to do or connect to, in plain words, e.g. \"postgres\", \"stripe payments\", \"web scraping\""
      • changedInput schema / properties / trait / description
        Previous value: -"require a capability trait"New value: +"require a trait: mcp = exposes an MCP server, oss = open source, keys = needs API keys, sandbox = runs sandboxed, guard = has guardrails"
  2. 1 tool update
    • Changedsubmit_harness1 field changed
      • changedInput schema / properties / baseUsdcAddress / description
        Previous value: -"Base USDC wallet (0x…) to receive tips — only if you want to get paid"New value: +"Base USDC wallet (0x…) to receive tips — must also appear in the repo's loadbay.json, .github/FUNDING.yml or README.md"
  3. 6 tool updates
    • First observedget_harness
    • First observedlist_domains
    • First observedsearch_harnesses
    • First observedsubmit_harness
    • First observedsupport_loadbay
    • First observedtip_harness

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