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Pick any line to see why it is the way it is: the commit, the pull request and issue it came from, and what the agent was thinking.

g1t has a plugin for Claude Code, in its own marketplace at the repository's root (claude plugin marketplace add https://g1t.sh/flagon-io/g1t.git, then claude plugin install g1t@g1t). Its hooks record each session on g1t through the g1t CLI in a working copy of a g1t repository: SessionStart starts the session (g1t session start --harness claude_code --harness-session-id, idempotent on Claude's session id) and gives Claude the work context of the issue the session claimed or the branch names (g1t work context N, waited for under a second, else a line saying how to load it), or a line on how to claim one; UserPromptSubmit logs the prompt's first 2,000 characters; PostToolUse logs the tool's name and one line on what it was called with, with anything that looks like a secret hidden, and never what it returned, and after a git push that reached the remote sets the session's head commit; Stop sends a heartbeat and SessionEnd ends the session with Claude's reason. The hooks are one Node script with no dependencies that returns at once and runs the CLI in a detached process; when g1t is missing or signed out it records nothing and says so once, and it installs nothing. G1T_RECORD_PROMPTS=0 keeps prompts back and G1T_RECORD=0 records nothing. The plugin also connects g1t's MCP server, has the skills work-on-issue, fix-integration and coordinate and the commands /g1t:claim, /g1t:status and /g1t:handoff, and plugins/other-harnesses has the AGENTS.md lines that do the same with the CLI for Codex and other agents. node --test plugins/claude-code/test/hooks.test.mjs checks the hooks against a stand-in CLI, and CI runs it.1#!/usr/bin/env node
2// g1t's Claude Code hooks. Claude Code runs this file for SessionStart,
3// UserPromptSubmit, PostToolUse, Stop and SessionEnd, with the event as JSON
4// on stdin. In a working copy of a g1t repository it records the session on
5// g1t through the `g1t` CLI:
6//
7// SessionStart g1t session start --harness claude_code --harness-session-id ID
8// and, when the branch or the session names an issue,
9// g1t work context N, given to Claude as context
10// UserPromptSubmit g1t session log --kind prompt TEXT (first 2,000 characters)
11// PostToolUse g1t session log --kind tool_call "Tool: what it was called with"
12// and after a git push that reached the remote,
13// g1t api update_session -f id=SESSION -f head_commit=SHA
14// Stop g1t session heartbeat
15// SessionEnd g1t session end --reason REASON
16//
17// What a tool returned (tool_response) is never read or sent. Prompts are
18// not sent when G1T_RECORD_PROMPTS=0, and nothing is when G1T_RECORD=0.
19//
20// Every hook returns at once: the CLI calls run in a detached process of
21// their own, so a slow network never holds Claude up. If `g1t` is not
22// installed or not signed in, nothing is recorded and Claude Code says so
23// once. Nothing is ever installed. No dependencies; Node 18 or later.
24
25import { spawn, spawnSync } from "node:child_process";
26import { existsSync, mkdirSync, readdirSync, readFileSync, rmSync, statSync, writeFileSync } from "node:fs";
27import { homedir } from "node:os";
28import { delimiter, dirname, isAbsolute, join, relative, resolve } from "node:path";
29import { fileURLToPath } from "node:url";
30
31/** The most of a prompt that is sent. */
32export const PROMPT_LIMIT = 2000;
33/** The most of a tool call's summary that is sent. */
34export const SUMMARY_LIMIT = 200;
35/** The most of an issue's work context given to Claude. */
36export const CONTEXT_LIMIT = 8000;
37/** How long SessionStart waits for an issue's work context. */
38const CONTEXT_WAIT_MS = 900;
39/** Exit code the g1t CLI gives when signing in is needed. */
40const EXIT_AUTH = 4;
41
42const SELF = fileURLToPath(import.meta.url);
43
44// --- what to send ------------------------------------------------------
45
46export function clip(text, limit) {
47 const value = String(text ?? "");
48 return value.length > limit ? `${value.slice(0, limit - 1)}…` : value;
49}
50
51/** Hides what looks like a secret in a command line before it is sent. */
52export function redact(text) {
53 return String(text)
54 .replace(/\b(g1t|ghp|gho|ghs|github_pat|glpat|xox[abpr]|sk-ant|sk|rk)[-_][A-Za-z0-9_-]{8,}/g, "$1_…")
55 .replace(/(authorization:\s*(?:bearer|basic|token)\s+)[^\s"']+/gi, "$1…")
56 .replace(/(\b[A-Za-z_]*(?:TOKEN|SECRET|PASSWORD|PASSWD|API_?KEY|PRIVATE_KEY)[A-Za-z_]*=)("[^"]*"|'[^']*'|\S+)/gi, "$1…")
57 .replace(/(--(?:token|password|secret)[= ])\S+/gi, "$1…")
58 .replace(/(https?:\/\/)[^\s/:@]+:[^\s/@]+@/g, "$1…@");
59}
60
61/** One line on what a tool was called with: never what it returned. */
62export function summarizeTool(name, input, cwd) {
63 const i = input && typeof input === "object" ? input : {};
64 const path = (p) => {
65 if (typeof p !== "string") return "";
66 if (cwd && isAbsolute(p)) {
67 const rel = relative(cwd, p);
68 if (rel && !rel.startsWith("..") && !isAbsolute(rel)) return rel.replaceAll("\\", "/");
69 }
70 return p;
71 };
72 let what = "";
73 if (typeof i.command === "string") what = i.command.split("\n")[0] + (i.command.includes("\n") ? " …" : "");
74 else if (i.file_path || i.notebook_path) what = path(i.file_path ?? i.notebook_path);
75 else if (typeof i.pattern === "string") what = `${i.pattern}${i.path ? ` in ${path(i.path)}` : ""}`;
76 else if (typeof i.url === "string") what = i.url;
77 else if (typeof i.query === "string") what = i.query;
78 else if (typeof i.description === "string") what = i.description;
79 else if (typeof i.action === "string") what = i.action;
80 const line = what ? `${name}: ${redact(what)}` : String(name);
81 return clip(line, SUMMARY_LIMIT);
82}
83
84/** The issue a branch is for, when its name holds the number: 42-fix, issue-42, fix/42, g1t/42-x. */
85export function issueFromBranch(branch) {
86 if (!branch || branch === "HEAD") return null;
87 if (/^(release|releases|hotfix|v\d)/i.test(branch)) return null;
88 const match = /(?:^|[/_-])(?:issues?-?|#)?(\d{1,7})(?=$|[/_-])/i.exec(branch);
89 if (!match) return null;
90 const n = Number(match[1]);
91 return n > 0 ? n : null;
92}
93
94/** The issue a shell command claims or attaches the session to, if any. */
95export function issueFromCommand(command) {
96 if (typeof command !== "string") return null;
97 const patterns = [
98 /\bg1t\s+work\s+claim\s+#?(\d+)/,
99 /\bg1t\s+session\s+(?:start|attach)\b[^|;&\n]*--issue[= ]#?(\d+)/,
100 /\bg1t\s+pr\s+create\b[^|;&\n]*--issue[= ]#?(\d+)/,
101 ];
102 for (const pattern of patterns) {
103 const match = pattern.exec(command);
104 if (match) return Number(match[1]);
105 }
106 return null;
107}
108
109export const isGitPush = (command) =>
110 typeof command === "string" && /(^|[\s;&|(])git(\s+-\S+(\s+[^-\s]\S*)?)*\s+push\b/.test(command);
111
112/**
113 * What a hook event asks for: the CLI calls to run in the background
114 * (`steps`), and whether to start the session first. Pure, so the tests
115 * can check it without a CLI.
116 */
117export function plan(event, env = process.env) {
118 const name = event?.hook_event_name;
119 const sid = event?.session_id;
120 if (!name || !sid || env.G1T_RECORD === "0") return null;
121 const cwd = event.cwd || process.cwd();
122 const job = { cwd, sid, steps: [] };
123 switch (name) {
124 case "SessionStart":
125 job.start = true;
126 return job;
127 case "UserPromptSubmit":
128 if (env.G1T_RECORD_PROMPTS === "0" || typeof event.prompt !== "string" || !event.prompt.trim()) return null;
129 job.steps.push({ args: ["session", "log", "--kind", "prompt", "--", clip(event.prompt, PROMPT_LIMIT)] });
130 return job;
131 case "PostToolUse": {
132 if (!event.tool_name) return null;
133 const input = event.tool_input ?? {};
134 job.steps.push({ args: ["session", "log", "--kind", "tool_call", "--", summarizeTool(event.tool_name, input, cwd)] });
135 if (event.tool_name === "Bash") {
136 const issue = issueFromCommand(input.command);
137 if (issue) job.issue = issue;
138 if (isGitPush(input.command)) job.steps.push({ headCommit: true });
139 }
140 return job;
141 }
142 case "Stop":
143 job.steps.push({ args: ["session", "heartbeat"] });
144 return job;
145 case "SessionEnd":
146 job.steps.push({ args: ["session", "end", "--reason", String(event.reason || "other")] });
147 job.end = true;
148 return job;
149 default:
150 return null;
151 }
152}
153
154// --- the machine -------------------------------------------------------
155
156function git(cwd, args) {
157 const out = spawnSync("git", args, { cwd, encoding: "utf8", windowsHide: true, timeout: 3000 });
158 return out.status === 0 ? out.stdout.trim() : null;
159}
160
161/** The g1t CLI on PATH, without running it. G1T_BIN names another. */
162export function findCli(env = process.env) {
163 if (env.G1T_BIN) return existsSync(env.G1T_BIN) ? env.G1T_BIN : null;
164 const names = process.platform === "win32" ? ["g1t.exe", "g1t"] : ["g1t"];
165 for (const dir of (env.PATH ?? env.Path ?? "").split(delimiter)) {
166 if (!dir) continue;
167 for (const name of names) {
168 const candidate = join(dir.replace(/^"|"$/g, ""), name);
169 try {
170 if (statSync(candidate).isFile()) return candidate;
171 } catch {}
172 }
173 }
174 return null;
175}
176
177/** Runs the CLI. A .js or .mjs G1T_BIN (the tests' stand-in) runs under Node. */
178function cli(bin, args, options) {
179 const script = /\.m?js$/.test(bin);
180 return spawnSync(script ? process.execPath : bin, script ? [bin, ...args] : args, {
181 encoding: "utf8",
182 windowsHide: true,
183 ...options,
184 });
185}
186
187/** Where the plugin keeps its state: Claude Code's data folder for it. */
188export function dataDir(env = process.env) {
189 return env.CLAUDE_PLUGIN_DATA || join(homedir(), ".g1t", "claude-code");
190}
191
192function readJson(path, fallback) {
193 try {
194 return JSON.parse(readFileSync(path, "utf8"));
195 } catch {
196 return fallback;
197 }
198}
199
200function write(path, text) {
201 try {
202 mkdirSync(dirname(path), { recursive: true });
203 writeFileSync(path, text);
204 } catch {}
205}
206
207const readText = (path) => {
208 try {
209 return readFileSync(path, "utf8").trim() || null;
210 } catch {
211 return null;
212 }
213};
214
215/** This session's files: its marker (it is in a g1t working copy), its g1t session id and its issue. */
216export function sessionFiles(sid, env = process.env) {
217 const dir = join(dataDir(env), "sessions");
218 const safe = String(sid).replace(/[^A-Za-z0-9_-]/g, "_");
219 return { dir, marker: join(dir, `${safe}.json`), id: join(dir, `${safe}.id`), issue: join(dir, `${safe}.issue`) };
220}
221
222/** Forgets sessions untouched for a week (ones that never saw SessionEnd). */
223function prune(dir) {
224 try {
225 const cutoff = Date.now() - 7 * 24 * 3600 * 1000;
226 for (const name of readdirSync(dir)) {
227 const path = join(dir, name);
228 if (statSync(path).mtimeMs < cutoff) rmSync(path, { force: true });
229 }
230 } catch {}
231}
232
233// --- saying so once ----------------------------------------------------
234
235const MESSAGES = {
236 missing:
237 "g1t: this session is not being recorded on g1t, because the g1t CLI is not installed. Install it (https://docs.g1t.sh/guides/cli/) and run `g1t auth login`. This is said once.",
238 signed_out:
239 "g1t: this session is not being recorded on g1t, because the g1t CLI is not signed in. Run `g1t auth login`. This is said once.",
240};
241
242/** Remembers a problem (missing, signed_out), or that there is none (null). */
243export function setProblem(env, problem) {
244 const path = join(dataDir(env), "notice.json");
245 const notice = readJson(path, {});
246 if ((notice.problem ?? null) === problem) return;
247 write(path, JSON.stringify({ problem, shown: false }));
248}
249
250/** The message for a problem not shown yet, marking it shown. */
251export function takeNotice(env) {
252 const path = join(dataDir(env), "notice.json");
253 const notice = readJson(path, {});
254 if (!notice.problem || notice.shown || !MESSAGES[notice.problem]) return null;
255 write(path, JSON.stringify({ ...notice, shown: true }));
256 return MESSAGES[notice.problem];
257}
258
259/** Whether a working copy's remotes are on g1t (g1t.sh, or G1T_HOST's host). */
260export function isG1tRemote(urls, env = process.env) {
261 if (env.G1T_REPO) return true;
262 const hosts = ["g1t.sh", env.G1T_HOST].filter(Boolean).map((h) => h.toLowerCase());
263 return urls.some((url) => hosts.some((host) => url.toLowerCase().includes(host)));
264}
265
266// --- the background half -----------------------------------------------
267
268/** Hands a job to a detached copy of this script and returns at once. */
269function background(job, env = process.env) {
270 const payload = Buffer.from(JSON.stringify(job)).toString("base64url");
271 try {
272 const child = spawn(process.execPath, [SELF, "--worker", payload], {
273 cwd: job.cwd,
274 detached: true,
275 stdio: "ignore",
276 windowsHide: true,
277 env,
278 });
279 child.on("error", () => {});
280 child.unref();
281 } catch {}
282}
283
284/** Starts the session if it needs to, then runs the job's steps in order. */
285export function work(job, env = process.env) {
286 const bin = findCli(env);
287 if (!bin) return setProblem(env, "missing");
288 const files = sessionFiles(job.sid, env);
289 if (job.issue) write(files.issue, String(job.issue));
290 const opts = { cwd: job.cwd, timeout: 20000, env: { ...env } };
291 let id = readText(files.id);
292 if (job.start || !id) {
293 const issue = job.issue ?? readText(files.issue);
294 const args = ["session", "start", "--harness", "claude_code", "--harness-session-id", job.sid];
295 if (issue) args.push("--issue", String(issue));
296 args.push("--json");
297 const out = cli(bin, args, opts);
298 if (out.status === EXIT_AUTH) return setProblem(env, "signed_out");
299 if (out.status !== 0) return;
300 setProblem(env, null);
301 try {
302 id = JSON.parse(out.stdout).id;
303 } catch {
304 id = /\bses_[A-Za-z0-9]+/.exec(out.stdout ?? "")?.[0] ?? null;
305 }
306 if (!id) return;
307 write(files.id, id);
308 }
309 opts.env.G1T_SESSION = id;
310 for (const step of job.steps) {
311 if (step.args) {
312 const out = cli(bin, step.args, opts);
313 if (out.status === EXIT_AUTH) return setProblem(env, "signed_out");
314 } else if (step.headCommit) {
315 // Only once the push reached the remote: HEAD is on a remote branch.
316 const head = git(job.cwd, ["rev-parse", "HEAD"]);
317 const remote = git(job.cwd, ["branch", "-r", "--contains", "HEAD"]);
318 if (head && remote) cli(bin, ["api", "update_session", "-f", `id=${id}`, "-f", `head_commit=${head}`, "--silent"], opts);
319 }
320 }
321 if (job.end) for (const path of [files.marker, files.id, files.issue]) rmSync(path, { force: true });
322}
323
324// --- the hooks ---------------------------------------------------------
325
326/**
327 * SessionStart: marks the session as one in a g1t working copy, and
328 * returns what to print: context for Claude, and a notice for you, once.
329 * Null outside a g1t working copy, where nothing is recorded.
330 */
331export function sessionStart(event, env = process.env, bin = findCli(env)) {
332 const cwd = event.cwd || process.cwd();
333 const gitDir = git(cwd, ["rev-parse", "--absolute-git-dir"]);
334 if (!gitDir) return null;
335 // The branch, from HEAD itself: also on a branch with no commits yet.
336 const branch = /^ref: refs\/heads\/(.+)$/m.exec(readText(join(gitDir, "HEAD")) ?? "")?.[1] ?? null;
337 const urls = (git(cwd, ["config", "--get-regexp", "^remote\\..*\\.url$"]) ?? "").split(/\r?\n/);
338 if (!isG1tRemote(urls, env)) return null;
339
340 const files = sessionFiles(event.session_id, env);
341 prune(files.dir);
342 write(files.marker, JSON.stringify({ cwd, git_dir: gitDir }));
343
344 const output = {};
345 if (!bin) setProblem(env, "missing");
346 const notice = takeNotice(env);
347 if (notice) output.systemMessage = notice;
348 if (!bin) return output;
349
350 if (env.CLAUDE_ENV_FILE) {
351 // Claude's own `g1t` commands then act in this session, not in another
352 // one in the same working copy. Read as each command runs, since the
353 // session's id arrives after this hook has returned.
354 const p = files.id.replaceAll("\\", "/");
355 try {
356 writeFileSync(env.CLAUDE_ENV_FILE, `[ -f "${p}" ] && export G1T_SESSION="$(cat "${p}")"\n`, { flag: "a" });
357 } catch {}
358 }
359
360 const remembered = Number(readText(files.issue)) || null;
361 const issue = remembered ?? issueFromBranch(branch);
362 let context;
363 if (issue) {
364 const where = remembered ? "this session's claim" : `the branch ${branch}`;
365 const out = cli(bin, ["work", "context", String(issue)], { cwd, timeout: CONTEXT_WAIT_MS, env });
366 if (out.status === 0 && out.stdout.trim()) {
367 context = `g1t: this session is working on issue #${issue} (from ${where}). Its work context on g1t:\n\n${clip(out.stdout.trim(), CONTEXT_LIMIT)}\n\nIf it is not claimed by this session yet, claim it with \`g1t work claim ${issue}\` before you start.`;
368 } else if (out.status === EXIT_AUTH) {
369 setProblem(env, "signed_out");
370 const now = takeNotice(env);
371 if (now) output.systemMessage = now;
372 } else {
373 context = `g1t: ${where} points at issue #${issue}. Load what is known about it with \`g1t work context ${issue}\`, and claim it with \`g1t work claim ${issue}\` before you start.`;
374 }
375 } else {
376 context =
377 "g1t: this is a g1t repository. Before starting on an issue, load it with `g1t work context N` and claim it with `g1t work claim N`, so the people and agents also working here know.";
378 }
379 if (context) output.hookSpecificOutput = { hookEventName: "SessionStart", additionalContext: context };
380 return output;
381}
382
383/** Runs one hook: what it prints, and the job it hands to the background. */
384export function hook(event, env = process.env) {
385 const job = plan(event, env);
386 if (!job) return { output: null, job: null };
387 if (event.hook_event_name === "SessionStart") {
388 const bin = findCli(env);
389 const output = sessionStart(event, env, bin);
390 if (!output) return { output: null, job: null };
391 return { output: Object.keys(output).length ? output : null, job: bin ? job : null };
392 }
393 // Only sessions SessionStart found in a g1t working copy are recorded.
394 if (!existsSync(sessionFiles(event.session_id, env).marker) || !findCli(env)) return { output: null, job: null };
395 const notice = event.hook_event_name === "UserPromptSubmit" ? takeNotice(env) : null;
396 return { output: notice ? { systemMessage: notice } : null, job };
397}
398
399async function main() {
400 if (process.argv[2] === "--worker") {
401 work(JSON.parse(Buffer.from(process.argv[3], "base64url").toString("utf8")));
402 return;
403 }
404 let raw = "";
405 for await (const chunk of process.stdin) raw += chunk;
406 const { output, job } = hook(JSON.parse(raw || "{}"));
407 if (output) process.stdout.write(JSON.stringify(output));
408 if (job) background(job);
409}
410
411if (process.argv[1] && resolve(process.argv[1]) === SELF) {
412 main()
413 .catch(() => {})
414 .finally(() => process.exit(0));
415}