arcgate

watchDelete

Deletes one of the box's watches. It never fires again.

Cost: Free. Signed by the box's agent over method DELETE, path /agent/v1/<address lowercased>/watch/<id> and no body (the hash of no bytes). Or send an ARCGATE-KEY of the account the box is linked to, with no signature. Another account's key, or any key for a box that is not linked, does not apply to the box: the call is checked as if no key were sent, so it needs the signature. A key nobody holds is a 401 key_invalid. The key keeps working after the account has lapsed (its grace has ended).
Inputs: address and id (path).
Returns: deleted and the id. Messages the watch already stored stay in the box. The price of the watch is not refunded.
Errors:
- 404 watch_not_found: the box has no watch with that id. It was never made, was already deleted, or is another box's.
Next:
- watchCreate: make a new watch (paid).

Input Schema

TableJSON Schema

Name	Required	Description
`id`	Yes	The watch's id: 22 base64url characters, as the create or the list returned it.
`address`	Yes	The box's address: the agent's own address (an EOA or an EIP-7702 account), any letter case. The box is keyed by it, and a signed request must be signed by it.
`agentSignature`	No	The agent's EIP-712 signature over this request, as the AGENT-SIGNATURE, AGENT-NONCE and AGENT-EXPIRY headers carry it over HTTP. Sign the typed data `AgentRequest` with fields `address` (the box), `method`, `path`, `bodyHash`, `nonce` and `expiry`, under the domain {name: "arcgate", version: "1"} with no chainId (a wallet that can only sign with one, such as Circle's, may add the chainId of the chain this deployment serves, 5042 on Arc mainnet, and no other). The `path` is the request path with every parameter filled in and the address lowercased. The `bodyHash` is the keccak256 of the canonical JSON of the body you send (sorted keys, no whitespace), or of no bytes when there is none. Omitting it is a 401 signature_required unless an ARCGATE-KEY of the account the box is linked to is sent (over MCP, on the connection), and it is never a charge: the call is free.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 19, 2026

changedInput schema / properties / agentSignature / description

Previous value: -"The agent's EIP-712 signature over this request, as the AGENT-SIGNATURE, AGENT-NONCE and AGENT-EXPIRY headers carry it over HTTP. Sign the typed data `AgentRequest` with fields `address` (the box), `method`, `path`, `bodyHash`, `nonce` and `expiry`, under the domain {name: \"arcgate\", version: \"1\"} with no chainId (a wallet that can only sign with one, such as Circle's, may add the chainId of the chain this deployment serves, 5042 on Arc mainnet, and no other). The `path` is the request path with every parameter filled in and the address lowercased. The `bodyHash` is the keccak256 of the canonical JSON of the body you send (sorted keys, no whitespace), or of no bytes when there is none. Omitting it is a 401 signature_required, never a charge: the call is free."New value: +"The agent's EIP-712 signature over this request, as the AGENT-SIGNATURE, AGENT-NONCE and AGENT-EXPIRY headers carry it over HTTP. Sign the typed data `AgentRequest` with fields `address` (the box), `method`, `path`, `bodyHash`, `nonce` and `expiry`, under the domain {name: \"arcgate\", version: \"1\"} with no chainId (a wallet that can only sign with one, such as Circle's, may add the chainId of the chain this deployment serves, 5042 on Arc mainnet, and no other). The `path` is the request path with every parameter filled in and the address lowercased. The `bodyHash` is the keccak256 of the canonical JSON of the body you send (sorted keys, no whitespace), or of no bytes when there is none. Omitting it is a 401 signature_required unless an ARCGATE-KEY of the account the box is linked to is sent (over MCP, on the connection), and it is never a charge: the call is free."

Changed1 schema field changedOct 8, 2026

changedInput schema / properties / agentSignature / description

Previous value: -"The agent's EIP-712 signature over this request, as the AGENT-SIGNATURE, AGENT-NONCE and AGENT-EXPIRY headers carry it over HTTP. Sign the typed data `AgentRequest` with fields `address` (the box), `method`, `path`, `bodyHash`, `nonce` and `expiry`, under the domain {name: \"arcgate\", version: \"1\"} with no chainId. The `path` is the request path with every parameter filled in and the address lowercased. The `bodyHash` is the keccak256 of the canonical JSON of the body you send (sorted keys, no whitespace), or of no bytes when there is none. Omitting it is a 401 signature_required, never a charge: the call is free."New value: +"The agent's EIP-712 signature over this request, as the AGENT-SIGNATURE, AGENT-NONCE and AGENT-EXPIRY headers carry it over HTTP. Sign the typed data `AgentRequest` with fields `address` (the box), `method`, `path`, `bodyHash`, `nonce` and `expiry`, under the domain {name: \"arcgate\", version: \"1\"} with no chainId (a wallet that can only sign with one, such as Circle's, may add the chainId of the chain this deployment serves, 5042 on Arc mainnet, and no other). The `path` is the request path with every parameter filled in and the address lowercased. The `bodyHash` is the keccak256 of the canonical JSON of the body you send (sorted keys, no whitespace), or of no bytes when there is none. Omitting it is a 401 signature_required, never a charge: the call is free."

AddedOct 7, 2026

TDQS

A4.6/5.0

Behavior5/5

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

With no annotations, the description carries the full burden and delivers: cost is free, two auth paths (agent signature vs ARCGATE-KEY), the exact signed path/method/bodyHash, and that a lapsed account's key still works. It also discloses that stored messages are retained and the watch price is not refunded — substantial behavioral context beyond structure.

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?

Front-loaded with the core purpose, then organized into Cost/Inputs/Returns/Errors/Next sections with zero filler. Some auth detail duplicates the signature schema description, slightly inflating length.

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, yet the returns are explicitly described (deleted and id), errors are enumerated (404 watch_not_found with causes), and the follow-up tool is named. An agent has everything needed to invoke it correctly.

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?

Schema coverage is 100%, so parameters are already well documented; the description nonetheless confirms address and id are path parameters and explains the request path construction. Adds meaningful framing over the schema baseline.

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 ('Deletes one of the box's watches') and adds the key consequence ('It never fires again'). An agent can distinguish it from watchCreate and watchList without opening any schema.

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?

Frames the tool as removing an existing watch and points to watchCreate as the inverse, with the '(paid)' note for creation. There is clear context but no explicit when-not guidance (e.g., versus leaving a watch running).

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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