# expectedHeadSha

The expected SHA of the pull request's HEAD ref (string, optional)

Agent View of the PolicyLayer registry record for `expectedHeadSha`. HTML page: https://policylayer.com/tools/io-github-aifity-omnigit-mcp/expectedheadsha

## Facts

- Tool: `expectedHeadSha`
- Server: GitHub (`oci:ghcr.io/aifity/omnigit-mcp:0.5.0`) — https://policylayer.com/tools/io-github-aifity-omnigit-mcp.md
- Homepage: https://github.com/aifity/omnigit-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": "expectedHeadSha",
    "arguments": {}
  }
}
```

## Why expectedHeadSha is rated Low

This tool retrieves a property value (a git commit SHA) for comparison or validation purposes. It has no side effects, does not execute operations, and does not modify any data. The context of pull request metadata inspection places it squarely in the Read category. The blast radius of misuse is minimal since it only exposes immutable commit identifiers already public in the repository.

From the tool's own definition: "Tool returns or references 'the expected SHA of the pull request's HEAD ref' — a read-only field that retrieves commit identification metadata without modifying state."

## Use case

AI agents call expectedHeadSha to retrieve information from GitHub 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 GitHub:

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

## Other tools on GitHub (244)

- `delete_file` — Destructive — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/delete-file.md
- `force` — Destructive — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/force.md
- `git_reset` — Destructive — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/git-reset.md
- `git_worktree_prune` — Destructive — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/git-worktree-prune.md
- `git_worktree_remove` — Destructive — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/git-worktree-remove.md
- `actions_run_trigger` — Execute — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/actions-run-trigger.md
- `detach` — Execute — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/detach.md
- `git_checkout` — Execute — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/git-checkout.md
- `git_pull` — Execute — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/git-pull.md
- `git_push` — Execute — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/git-push.md
- `git_worktree_add` — Execute — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/git-worktree-add.md
- `git_worktree_lock` — Execute — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/git-worktree-lock.md
- `autoInit` — Other — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/autoinit.md
- `base` — Other — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/base.md
- `base_branch` — Other — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/base-branch.md
- `base_ref` — Other — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/base-ref.md
- `before_id` — Other — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/before-id.md
- `branch` — Other — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/branch.md
- `branch_name` — Other — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/branch-name.md
- `color` — Other — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/color.md
- `comment_id` — Other — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/comment-id.md
- `commentId` — Other — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/commentid.md
- `commit_title` — Other — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/commit-title.md
- `commitID` — Other — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/commitid.md
- `direction` — Other — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/direction.md
- `gist_id` — Other — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/gist-id.md
- `issue_number` — Other — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/issue-number.md
- `item_type` — Other — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/item-type.md
- `job_id` — Other — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/job-id.md
- `message` — Other — https://policylayer.com/tools/io-github-aifity-omnigit-mcp/message.md
- …and 214 more: https://policylayer.com/tools/io-github-aifity-omnigit-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=io-github-aifity-omnigit-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-aifity-omnigit-mcp