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arcgate

by dev.arcgate
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telegramLink

Issues a new one-time link code for one of the box's Telegram channels, to link a chat again after /stop, a block or a disable.

  • Cost: Free. Signed by the box's agent over method POST, path /agent/v1/<address lowercased>/telegram/<id>/link 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). No body.

  • Returns: the id, the new code, the t.me link and expiresAt. The code is a secret and shown only now. Any earlier code stops working. Sending it to the bot links that chat, enables the channel and clears its failure count.

  • Errors:

    • 404 telegram_not_found: the box has no Telegram channel with that id.

    • 503 telegram_unavailable: this arcgate has no bot configured. Try again later.

  • Next:

    • telegramList: check for linked: true once the chat is linked.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
idYesThe Telegram channel's id: 22 base64url characters, as the create or the list returned it.
addressYesThe 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.
agentSignatureNoThe 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.

  1. Changed1 schema field changed
    • 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."
  2. Changed1 schema field changed
    • 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."
  3. Added

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 does so thoroughly: cost (free), the exact signing scheme (method POST, path, no-body hash), the ARCGATE-KEY alternative and its limits (another account's key does not apply; a key for an unlinked box does not apply; key survives account lapse), the destructive-ish side effect that any earlier code stops working, and the resulting state change when the code is sent to the bot (links chat, enables channel, clears failure count). Errors 404 telegram_not_found and 503 telegram_unavailable are spelled out.

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?

Bold section labels (Cost, Inputs, Returns, Errors, Next) front-load the purpose and make scanning easy. The auth paragraph is dense and long, but nearly every clause is load-bearing for a signature-gated endpoint; only minor tightening 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?

No output schema exists, yet the description enumerates the return fields (id, code, t.me link, expiresAt), warns the code is a one-time secret, and covers the two documented error cases plus the follow-up tool. Combined with the full auth model, an agent has everything needed to call and interpret this 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 description coverage is already 100%, so the baseline is 3. The description adds call-time framing the schema scatters elsewhere: it names 'address' and 'id' as path parameters and states explicitly there is no body, which is directly useful when assembling the signed request.

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 — 'Issues a new one-time link code for one of the box's Telegram channels' — plus the trigger scenario ('to link a chat again after /stop, a block or a disable'). This clearly separates it from telegramCreate, telegramList and telegramDelete without needing to open 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?

Gives an explicit when-to-use condition (re-linking after /stop, a block, or a disable) and a concrete follow-up step pointing at telegramList to verify 'linked: true'. It does not explicitly exclude or contrast against telegramCreate for first-time linking, so it stops just short of a full 5.

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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