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AssetFare USDC Bridge

by io.github.assetfare
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assetfare_v2_session_observe_output

Idempotent

Record an already-produced bridge or destination output, then advance the workflow. Example: pass the output hash, a new idempotency key, and the original verification_context. Any next current_action is deeply verified and receives a wallet handoff. AssetFare never signs or submits.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
session_idYesV2 workflow session UUID returned by assetfare_v2_session_create. Use only with assetfare_v2_session_* tools; do not pass a legacy session ID.
session_tokenYesSensitive caller-generated v2 session capability: at least 32 CSPRNG bytes encoded as 43-128 URL-safe base64 characters. Generate it locally; never log it or substitute a private key or legacy access token.
idempotency_keyYesCaller-generated retry key, 8-128 characters. Reuse it only when retrying the same logical mutation; choose a new key for a new operation. Strict approval_v3 requests additionally enforce its ASCII key pattern.
transaction_hashNoOptional bridge or destination transaction hash already produced outside AssetFare. Omit only when the provider output can be observed without a hash.
verification_contextYesStrict caller-held context copied from the selected quote and approval. It contains public intent/wallet data only, never the raw session token or a private key, and is required whenever a remote MCP session call can return current_action.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
signedYes
statusYes
submittedYes
session_idYes
quote_bindingYes
current_actionYes
server_signingYes
action_availableYes
server_submissionYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed8 schema fields changed
    • changedInput schema / properties / verification_context / properties / direct_route_summary / properties / from / enum
      Previous value: -[
-  "solana:SOL",
-  "solana:USDC",
-  "solana:USDG",
-  "base:ETH",
-  "base:USDC",
-  "arbitrum:ETH",
-  "arbitrum:USDC",
-  "robinhood:ETH",
-  "robinhood:USDG",
-  "polygon:USDC",
-  "optimism:USDC",
-  "ethereum:USDC",
-  "hyperevm:USDC",
-  "xlayer:USDC",
-  "sei:USDC",
-  "sonic:USDC"
-]New value: +[
+  "solana:SOL",
+  "solana:USDC",
+  "solana:USDG",
+  "base:ETH",
+  "base:USDC",
+  "arbitrum:ETH",
+  "arbitrum:USDC",
+  "robinhood:ETH",
+  "robinhood:USDG",
+  "polygon:USDC",
+  "optimism:USDC",
+  "ethereum:USDC",
+  "hyperevm:USDC",
+  "xlayer:USDC",
+  "sei:USDC",
+  "sonic:USDC",
+  "monad:USDC",
+  "avalanche:USDC",
+  "cronos:USDC",
+  "injective:USDC",
+  "linea:USDC",
+  "aptos:USDC"
+]
    • changedInput schema / properties / verification_context / properties / direct_route_summary / properties / mode / enum
      Previous value: -[
-  "cctp_direct_composition",
-  "optimism_source_cctp",
-  "polygon_source_cctp",
-  "robinhood_across_ingress_composition",
-  "robinhood_paxos_egress_composition",
-  "robinhood_paxos_ingress_composition",
-  "same_chain_direct",
-  "same_chain_direct_composition"
-]New value: +[
+  "aptos_move_cctp_direct",
+  "cctp_direct_composition",
+  "optimism_source_cctp",
+  "polygon_source_cctp",
+  "robinhood_across_ingress_composition",
+  "robinhood_paxos_egress_composition",
+  "robinhood_paxos_ingress_composition",
+  "same_chain_direct",
+  "same_chain_direct_composition"
+]
    • changedInput schema / properties / verification_context / properties / direct_route_summary / properties / route / enum
      Previous value: -[
-  "solana:SOL->solana:USDC",
-  "solana:SOL->solana:USDG",
-  "solana:SOL->base:ETH",
-  "solana:SOL->base:USDC",
-  "solana:SOL->arbitrum:ETH",
-  "solana:SOL->arbitrum:USDC",
-  "solana:SOL->robinhood:ETH",
-  "solana:SOL->robinhood:USDG",
-  "solana:USDC->solana:SOL",
-  "solana:USDC->solana:USDG",
-  "solana:USDC->base:ETH",
-  "solana:USDC->base:USDC",
-  "solana:USDC->arbitrum:ETH",
-  "solana:USDC->arbitrum:USDC",
-  "solana:USDC->robinhood:ETH",
-  "solana:USDC->robinhood:USDG",
-  "solana:USDG->solana:SOL",
-  "solana:USDG->solana:USDC",
-  "solana:USDG->base:ETH",
-  "solana:USDG->base:USDC",
-  "solana:USDG->arbitrum:ETH",
-  "solana:USDG->arbitrum:USDC",
-  "solana:USDG->robinhood:ETH",
-  "solana:USDG->robinhood:USDG",
-  "base:ETH->solana:SOL",
-  "base:ETH->solana:USDC",
-  "base:ETH->solana:USDG",
-  "base:ETH->base:USDC",
-  "base:ETH->arbitrum:ETH",
-  "base:ETH->arbitrum:USDC",
-  "base:ETH->robinhood:ETH",
-  "base:ETH->robinhood:USDG",
-  "base:USDC->solana:SOL",
-  "base:USDC->solana:USDC",
-  "base:USDC->solana:USDG",
-  "base:USDC->base:ETH",
-  "base:USDC->arbitrum:ETH",
-  "base:USDC->arbitrum:USDC",
-  "base:USDC->robinhood:ETH",
-  "base:USDC->robinhood:USDG",
-  "arbitrum:ETH->solana:SOL",
-  "arbitrum:ETH->solana:USDC",
-  "arbitrum:ETH->solana:USDG",
-  "arbitrum:ETH->base:ETH",
-  "arbitrum:ETH->base:USDC",
-  "arbitrum:ETH->arbitrum:USDC",
-  "arbitrum:ETH->robinhood:ETH",
-  "arbitrum:ETH->robinhood:USDG",
-  "arbitrum:USDC->solana:SOL",
-  "arbitrum:USDC->solana:USDC",
-  "arbitrum:USDC->solana:USDG",
-  "arbitrum:USDC->base:ETH",
-  "arbitrum:USDC->base:USDC",
-  "arbitrum:USDC->arbitrum:ETH",
-  "arbitrum:USDC->robinhood:ETH",
-  "arbitrum:USDC->robinhood:USDG",
-  "robinhood:ETH->solana:SOL",
-  "robinhood:ETH->solana:USDC",
-  "robinhood:ETH->solana:USDG",
-  "robinhood:ETH->base:ETH",
-  "robinhood:ETH->base:USDC",
-  "robinhood:ETH->arbitrum:ETH",
-  "robinhood:ETH->arbitrum:USDC",
-  "robinhood:ETH->robinhood:USDG",
-  "robinhood:USDG->solana:SOL",
-  "robinhood:USDG->solana:USDC",
-  "robinhood:USDG->solana:USDG",
-  "robinhood:USDG->base:ETH",
-  "robinhood:USDG->base:USDC",
-  "robinhood:USDG->arbitrum:ETH",
-  "robinhood:USDG->arbitrum:USDC",
-  "robinhood:USDG->robinhood:ETH",
-  "polygon:USDC->base:USDC",
-  "polygon:USDC->arbitrum:USDC",
-  "optimism:USDC->base:USDC",
-  "optimism:USDC->arbitrum:USDC",
-  "ethereum:USDC->solana:USDC",
-  "ethereum:USDC->base:USDC",
-  "hyperevm:USDC->solana:USDC",
-  "hyperevm:USDC->base:USDC",
-  "xlayer:USDC->solana:USDC",
-  "xlayer:USDC->base:USDC",
-  "sei:USDC->solana:USDC",
-  "sei:USDC->base:USDC",
-  "sonic:USDC->solana:USDC",
-  "sonic:USDC->base:USDC"
-]New value: +[
+  "solana:SOL->solana:USDC",
+  "solana:SOL->solana:USDG",
+  "solana:SOL->base:ETH",
+  "solana:SOL->base:USDC",
+  "solana:SOL->arbitrum:ETH",
+  "solana:SOL->arbitrum:USDC",
+  "solana:SOL->robinhood:ETH",
+  "solana:SOL->robinhood:USDG",
+  "solana:USDC->solana:SOL",
+  "solana:USDC->solana:USDG",
+  "solana:USDC->base:ETH",
+  "solana:USDC->base:USDC",
+  "solana:USDC->arbitrum:ETH",
+  "solana:USDC->arbitrum:USDC",
+  "solana:USDC->robinhood:ETH",
+  "solana:USDC->robinhood:USDG",
+  "solana:USDG->solana:SOL",
+  "solana:USDG->solana:USDC",
+  "solana:USDG->base:ETH",
+  "solana:USDG->base:USDC",
+  "solana:USDG->arbitrum:ETH",
+  "solana:USDG->arbitrum:USDC",
+  "solana:USDG->robinhood:ETH",
+  "solana:USDG->robinhood:USDG",
+  "base:ETH->solana:SOL",
+  "base:ETH->solana:USDC",
+  "base:ETH->solana:USDG",
+  "base:ETH->base:USDC",
+  "base:ETH->arbitrum:ETH",
+  "base:ETH->arbitrum:USDC",
+  "base:ETH->robinhood:ETH",
+  "base:ETH->robinhood:USDG",
+  "base:USDC->solana:SOL",
+  "base:USDC->solana:USDC",
+  "base:USDC->solana:USDG",
+  "base:USDC->base:ETH",
+  "base:USDC->arbitrum:ETH",
+  "base:USDC->arbitrum:USDC",
+  "base:USDC->robinhood:ETH",
+  "base:USDC->robinhood:USDG",
+  "arbitrum:ETH->solana:SOL",
+  "arbitrum:ETH->solana:USDC",
+  "arbitrum:ETH->solana:USDG",
+  "arbitrum:ETH->base:ETH",
+  "arbitrum:ETH->base:USDC",
+  "arbitrum:ETH->arbitrum:USDC",
+  "arbitrum:ETH->robinhood:ETH",
+  "arbitrum:ETH->robinhood:USDG",
+  "arbitrum:USDC->solana:SOL",
+  "arbitrum:USDC->solana:USDC",
+  "arbitrum:USDC->solana:USDG",
+  "arbitrum:USDC->base:ETH",
+  "arbitrum:USDC->base:USDC",
+  "arbitrum:USDC->arbitrum:ETH",
+  "arbitrum:USDC->robinhood:ETH",
+  "arbitrum:USDC->robinhood:USDG",
+  "robinhood:ETH->solana:SOL",
+  "robinhood:ETH->solana:USDC",
+  "robinhood:ETH->solana:USDG",
+  "robinhood:ETH->base:ETH",
+  "robinhood:ETH->base:USDC",
+  "robinhood:ETH->arbitrum:ETH",
+  "robinhood:ETH->arbitrum:USDC",
+  "robinhood:ETH->robinhood:USDG",
+  "robinhood:USDG->solana:SOL",
+  "robinhood:USDG->solana:USDC",
+  "robinhood:USDG->solana:USDG",
+  "robinhood:USDG->base:ETH",
+  "robinhood:USDG->base:USDC",
+  "robinhood:USDG->arbitrum:ETH",
+  "robinhood:USDG->arbitrum:USDC",
+  "robinhood:USDG->robinhood:ETH",
+  "polygon:USDC->base:USDC",
+  "polygon:USDC->arbitrum:USDC",
+  "optimism:USDC->base:USDC",
+  "optimism:USDC->arbitrum:USDC",
+  "ethereum:USDC->solana:USDC",
+  "ethereum:USDC->base:USDC",
+  "hyperevm:USDC->solana:USDC",
+  "hyperevm:USDC->base:USDC",
+  "xlayer:USDC->solana:USDC",
+  "xlayer:USDC->base:USDC",
+  "sei:USDC->solana:USDC",
+  "sei:USDC->base:USDC",
+  "sonic:USDC->solana:USDC",
+  "sonic:USDC->base:USDC",
+  "monad:USDC->solana:USDC",
+  "monad:USDC->base:USDC",
+  "avalanche:USDC->solana:USDC",
+  "avalanche:USDC->base:USDC",
+  "cronos:USDC->solana:USDC",
+  "cronos:USDC->base:USDC",
+  "injective:USDC->solana:USDC",
+  "injective:USDC->base:USDC",
+  "linea:USDC->solana:USDC",
+  "linea:USDC->base:USDC",
+  "aptos:USDC->solana:USDC",
+  "aptos:USDC->base:USDC"
+]
    • changedInput schema / properties / verification_context / properties / direct_route_summary / properties / steps / items / properties / from / enum
      Previous value: -[
-  "solana:SOL",
-  "solana:USDC",
-  "solana:USDG",
-  "base:ETH",
-  "base:USDC",
-  "arbitrum:ETH",
-  "arbitrum:USDC",
-  "robinhood:ETH",
-  "robinhood:USDG",
-  "polygon:USDC",
-  "optimism:USDC",
-  "ethereum:USDC",
-  "hyperevm:USDC",
-  "xlayer:USDC",
-  "sei:USDC",
-  "sonic:USDC"
-]New value: +[
+  "solana:SOL",
+  "solana:USDC",
+  "solana:USDG",
+  "base:ETH",
+  "base:USDC",
+  "arbitrum:ETH",
+  "arbitrum:USDC",
+  "robinhood:ETH",
+  "robinhood:USDG",
+  "polygon:USDC",
+  "optimism:USDC",
+  "ethereum:USDC",
+  "hyperevm:USDC",
+  "xlayer:USDC",
+  "sei:USDC",
+  "sonic:USDC",
+  "monad:USDC",
+  "avalanche:USDC",
+  "cronos:USDC",
+  "injective:USDC",
+  "linea:USDC",
+  "aptos:USDC"
+]
    • changedInput schema / properties / verification_context / properties / intent / properties / from_chain / description
      Previous value: -"Source chain for the v2 route. Polygon, Optimism, Ethereum, HyperEVM, X Layer, Sei and Sonic are source-only and cannot be used as to_chain."New value: +"Source chain for the v2 route. Polygon, Optimism, Ethereum, HyperEVM, X Layer, Sei, Sonic, Monad, Avalanche, Cronos, Injective, Linea, and Aptos are source-only and cannot be used as to_chain."
    • changedInput schema / properties / verification_context / properties / intent / properties / from_chain / enum
      Previous value: -[
-  "solana",
-  "base",
-  "arbitrum",
-  "robinhood",
-  "polygon",
-  "optimism",
-  "ethereum",
-  "hyperevm",
-  "xlayer",
-  "sei",
-  "sonic"
-]New value: +[
+  "solana",
+  "base",
+  "arbitrum",
+  "robinhood",
+  "polygon",
+  "optimism",
+  "ethereum",
+  "hyperevm",
+  "xlayer",
+  "sei",
+  "sonic",
+  "monad",
+  "avalanche",
+  "cronos",
+  "injective",
+  "linea",
+  "aptos"
+]
    • changedInput schema / properties / verification_context / properties / wallets / additionalProperties / description
      Previous value: -"Caller-owned public wallet address: 0x plus 40 hex characters for EVM, or 32-44 base58 characters for Solana. Never provide secret key material."New value: +"Caller-owned public wallet address: 0x plus 40 hex characters for EVM, 0x plus 64 hex characters for Aptos, or 32-44 base58 characters for Solana. Never provide secret key material."
    • changedInput schema / properties / verification_context / properties / wallets / propertyNames / enum
      Previous value: -[
-  "solana",
-  "base",
-  "arbitrum",
-  "robinhood",
-  "polygon",
-  "optimism",
-  "ethereum",
-  "hyperevm",
-  "xlayer",
-  "sei",
-  "sonic"
-]New value: +[
+  "solana",
+  "base",
+  "arbitrum",
+  "robinhood",
+  "polygon",
+  "optimism",
+  "ethereum",
+  "hyperevm",
+  "xlayer",
+  "sei",
+  "sonic",
+  "monad",
+  "avalanche",
+  "cronos",
+  "injective",
+  "linea",
+  "aptos"
+]
  2. First observed

TDQS

A3.7/5.0
Behavior4/5

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

Annotations already declare the safety profile (readOnlyHint=false, destructive=false, idempotent=true, openWorld=true). The description adds value beyond that: it discloses that the workflow advances, that the next current_action is 'deeply verified' and receives a wallet handoff, and reiterates 'AssetFare never signs or submits.' That is meaningful post-call behavior context.

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?

Four sentences, purpose front-loaded, with a concrete example and a constraint stated compactly. Slightly dense but no filler; nothing in it is redundant.

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?

An output schema exists, so return values need no explanation, and annotations carry the safety profile. The description covers the mutation's purpose and downstream behavior adequately for a complex nested-param tool, though it could more explicitly route between the observe_source and observe_output siblings.

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%, so the schema already fully documents all five parameters including the nested verification_context. The description references the output hash, idempotency key, and verification_context but adds no syntax or format detail beyond what the schema provides. Baseline 3 is appropriate.

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?

States a specific verb and resource ('Record an already-produced bridge or destination output') plus the side effect ('then advance the workflow'). The 'bridge or destination' scoping implicitly distinguishes it from the source-observing sibling, though it doesn't name assetfare_v2_session_observe_source explicitly.

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

Usage Guidelines3/5

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

Provides a concrete example of when to call it (pass the output hash, a new idempotency key, and the original verification_context), which implies the usage context. However it never states when NOT to use this tool or names the alternative (observe_source) for the opposite case.

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

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