Files
shockbot/mcp/commitInfo.ts
T
Colin McDonnell b9f0938405 mcp: restore operational guidance dropped in #723
#723's revision pass cut four substantive strings along with the
negative anchors. those strings address real, audit-observed failure
modes and the positive examples don't carry them.

restored:
- push_branch: "if the response reports a timeout, the underlying
  push may have actually succeeded — verify with git log
  origin/<branch> before retrying" (was on the tool description)
- create_pull_request_review commit_id .describe(): "must be the FULL
  40-character SHA — abbreviated SHAs are rejected by GitHub with 422"
- create_pull_request_review comments[].line .describe(): "must sit
  inside a `@@` hunk... dropped entries are reported under
  droppedComments in the response"
- create_pull_request_review comments[].start_line .describe(): "both
  start_line and line must sit inside the same @@ hunk"

also: get_commit_info example used a 31-character SHA (non-standard
truncation). swapped to a 7-char short form, which is what git
log --oneline emits and what agents see in practice. note that this
tool accepts either full or abbreviated, unlike create_pull_request_review
which requires full.
2026-05-13 22:49:06 +00:00

62 lines
2.2 KiB
TypeScript

import { writeFileSync } from "node:fs";
import { join } from "node:path";
import { type } from "arktype";
import { log } from "../utils/cli.ts";
import { formatFilesWithLineNumbers } from "./checkout.ts";
import type { ToolContext } from "./server.ts";
import { execute, tool } from "./shared.ts";
export const CommitInfo = type({
sha: type.string.describe("the commit SHA (full or abbreviated) to fetch"),
});
export function CommitInfoTool(ctx: ToolContext) {
return tool({
name: "get_commit_info",
description:
"Retrieve commit metadata and diff via GitHub API. Use this instead of git show for reviewing commits - " +
"it works with shallow clones and shows the actual changes in the commit. Returns diffPath pointing to formatted diff file. " +
'Example: `get_commit_info({ sha: "2a6ab5d" })`.',
parameters: CommitInfo,
execute: execute(async ({ sha }) => {
const response = await ctx.octokit.rest.repos.getCommit({
owner: ctx.repo.owner,
repo: ctx.repo.name,
ref: sha,
});
const data = response.data;
const files = data.files ?? [];
// format diff with line numbers and write to file
const formatResult = formatFilesWithLineNumbers(files);
const tempDir = process.env.PULLFROG_TEMP_DIR;
if (!tempDir) {
throw new Error(
"PULLFROG_TEMP_DIR not set - get_commit_info must run in pullfrog action context"
);
}
const diffFile = join(tempDir, `commit-${sha.slice(0, 7)}.diff`);
writeFileSync(diffFile, formatResult.content);
log.debug(`wrote commit diff to ${diffFile} (${formatResult.content.length} bytes)`);
return {
sha: data.sha,
message: data.commit.message,
author: data.author?.login ?? null,
committer: data.committer?.login ?? null,
date: data.commit.author?.date ?? data.commit.committer?.date ?? "",
url: data.html_url,
parents: data.parents.map((p) => p.sha),
stats: {
additions: data.stats?.additions ?? 0,
deletions: data.stats?.deletions ?? 0,
total: data.stats?.total ?? 0,
},
fileCount: files.length,
diffFile,
};
}),
});
}