1import { Type } from "@sinclair/typebox";
 2import type { AgentTool } from "@mariozechner/pi-agent-core";
 3import simpleGit from "simple-git";
 4import { ToolInputError } from "../../../util/errors.js";
 5
 6// Trust boundary: refs and paths are passed directly to simple-git, which is
 7// scoped to the workspace. The user chose to clone this repo, so its contents
 8// are trusted. See AGENTS.md § Workspace Sandboxing.
 9
10const DEFAULT_LOG_LIMIT = 20;
11
12const LogSchema = Type.Object({
13  path: Type.Optional(Type.String({ description: "Filter to commits touching this path" })),
14  author: Type.Optional(Type.String({ description: "Filter by author name/email" })),
15  since: Type.Optional(Type.String({ description: "Commits after this date (e.g., 2024-01-01)" })),
16  until: Type.Optional(Type.String({ description: "Commits before this date" })),
17  n: Type.Optional(Type.Number({ description: "Maximum number of commits (default: 20)" })),
18  oneline: Type.Optional(Type.Boolean({ description: "Compact one-line format (default: false)" })),
19});
20
21export const createGitLogTool = (workspacePath: string): AgentTool => ({
22  name: "git_log",
23  label: "Git Log",
24  description: "View commit history. Supports filtering by path, author, date range, and count.",
25  parameters: LogSchema as any,
26  execute: async (_toolCallId: string, params: any) => {
27    const git = simpleGit(workspacePath);
28    const options: string[] = [];
29
30    const limit = params.n !== undefined ? params.n : DEFAULT_LOG_LIMIT;
31    if (typeof limit !== "number" || Number.isNaN(limit) || limit <= 0) {
32      throw new ToolInputError("n must be a positive number");
33    }
34    options.push("-n", String(Math.floor(limit)));
35    if (params.oneline) options.push("--oneline");
36    if (params.author !== undefined) {
37      if (!String(params.author).trim()) {
38        throw new ToolInputError("author must be a non-empty string");
39      }
40      options.push(`--author=${params.author}`);
41    }
42    if (params.since !== undefined) {
43      if (!String(params.since).trim()) {
44        throw new ToolInputError("since must be a non-empty string");
45      }
46      options.push(`--since=${params.since}`);
47    }
48    if (params.until !== undefined) {
49      if (!String(params.until).trim()) {
50        throw new ToolInputError("until must be a non-empty string");
51      }
52      options.push(`--until=${params.until}`);
53    }
54
55    const result = await git.log(options.concat(params.path ? ["--", params.path] : []));
56
57    const text = result.all
58      .map((entry) =>
59        params.oneline
60          ? `${entry.hash} ${entry.message}`
61          : `${entry.hash} ${entry.date} ${entry.author_name} ${entry.message}`,
62      )
63      .join("\n");
64
65    return {
66      content: [{ type: "text", text }],
67      details: { count: result.all.length },
68    };
69  },
70});