# wallet_getHeaderForHeight

Gets the 80-byte block header at a given height.

Agent View of the PolicyLayer registry record for `wallet_getHeaderForHeight`. HTML page: https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-getheaderforheight

## Facts

- Tool: `wallet_getHeaderForHeight`
- Server: Bitcoin SV MCP Server (`b-open-io/bsv-mcp`) — https://policylayer.com/tools/b-open-io-bsv-mcp.md
- Homepage: https://github.com/b-open-io/bsv-mcp
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Allowed

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "wallet_getHeaderForHeight",
    "arguments": {}
  }
}
```

## Why wallet_getHeaderForHeight is rated Low

This tool retrieves a read-only block header from the blockchain at a specified height. It performs a query operation (get) with no capability to modify, delete, or execute code. The data returned is immutable historical blockchain information. Even in an adversarial scenario, misuse would only allow an agent to retrieve existing public blockchain data, presenting minimal risk.

From the tool's own definition: "Tool name 'wallet_getHeaderForHeight' and description 'Gets the 80-byte block header at a given height' indicate a retrieval operation that queries blockchain data without modification or side effects."

## Use case

AI agents call wallet_getHeaderForHeight to retrieve information from Bitcoin SV MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Bitcoin SV MCP Server:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "wallet_getHeaderForHeight": {}
  }
}
```

## Other tools on Bitcoin SV MCP Server (89)

- `wallet_abortAction` — Destructive — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-abortaction.md
- `wallet_relinquishCertificate` — Destructive — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-relinquishcertificate.md
- `wallet_relinquishOutput` — Destructive — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-relinquishoutput.md
- `wallet_remove` — Destructive — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-remove.md
- `bap_friend` — Execute — https://policylayer.com/tools/b-open-io-bsv-mcp/bap-friend.md
- `utils_installAgentMaster` — Execute — https://policylayer.com/tools/b-open-io-bsv-mcp/utils-installagentmaster.md
- `wallet_createHmac` — Execute — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-createhmac.md
- `wallet_createSignature` — Execute — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-createsignature.md
- `wallet_decrypt` — Execute — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-decrypt.md
- `wallet_encrypt` — Execute — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-encrypt.md
- `wallet_proveCertificate` — Execute — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-provecertificate.md
- `wallet_signAction` — Execute — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-signaction.md
- `wallet_signBsm` — Execute — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-signbsm.md
- `wallet_waitForAuthentication` — Execute — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-waitforauthentication.md
- `x402_request` — Execute — https://policylayer.com/tools/b-open-io-bsv-mcp/x402-request.md
- `bsocial_createPost` — Financial — https://policylayer.com/tools/b-open-io-bsv-mcp/bsocial-createpost.md
- `droplit_fund` — Financial — https://policylayer.com/tools/b-open-io-bsv-mcp/droplit-fund.md
- `mnee_sendMnee` — Financial — https://policylayer.com/tools/b-open-io-bsv-mcp/mnee-sendmnee.md
- `wallet_acquireCertificate` — Financial — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-acquirecertificate.md
- `wallet_cancelListing` — Financial — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-cancellisting.md
- `wallet_createAction` — Financial — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-createaction.md
- `wallet_createOrdinals` — Financial — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-createordinals.md
- `wallet_listOrdinal` — Financial — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-listordinal.md
- `wallet_lockBsv` — Financial — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-lockbsv.md
- `wallet_mintCollection` — Financial — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-mintcollection.md
- `wallet_opnsDeregister` — Financial — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-opnsderegister.md
- `wallet_purchaseListing` — Financial — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-purchaselisting.md
- `wallet_sendAllBsv` — Financial — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-sendallbsv.md
- `wallet_sendBsv` — Financial — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-sendbsv.md
- `wallet_sweepBsv` — Financial — https://policylayer.com/tools/b-open-io-bsv-mcp/wallet-sweepbsv.md
- …and 59 more: https://policylayer.com/tools/b-open-io-bsv-mcp.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=b-open-io-bsv-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/b-open-io-bsv-mcp