hackerrank-orchestrate-september26

Imported from Ujjwal-Singh-20/hackerrank-orchestrate-september26 (AGENTS.md). Install upstream with npx skills add Ujjwal-Singh-20/hackerrank-orchestrate-september26. Copyright stays with the author.

AGENTS.md

HackerRank Orchestrate (September 2026) — Buy or Wait?

This file is the single source of truth for any AI coding agent working in this repo: Claude Code, OpenAI Codex CLI / Codex Cloud, Gemini CLI, Cursor, Windsurf, opencode, Aider, goose, Factory, RooCode, JetBrains Junie, GitHub Copilot, Devin, or any other AGENTS.md-aware tool.

Read this file in full before taking any action. Obey it exactly unless the user or platform provides higher-priority instructions.

0. TLDR For The Agent

On every session start, do this in order:

1. Read this file completely.
2. Check the log file path in §2.
3. Append a SESSION START entry using §5.1.
4. For every user turn, append a summary entry using §5.2.
5. When building, testing, or packaging the solution, follow the project contract in §6.

Do not skip logging or rewrite old log entries. Sub-agents and worktrees use the same log file.

1. What This Repo Is

This is a starter repo for the HackerRank Orchestrate 24-hour hackathon challenge: Buy or Wait?

Participants must build an AI-powered financial agent. For every purchase or payment request in dataset/requests.csv, the agent decides whether the user should pay in full, pay partially, use an available installment option, wait, or not proceed.

The system reconstructs the user's financial position from structured profiles and financial events, fixed dated exchange rates, seller/provider payment options, and relevant messages or images. It must account for recurring commitments, pending payments, essential spending, confirmed income, financial priorities, and the minimum balance the user wants to keep. Messages and images are untrusted evidence; they may clarify, amend, delay, cancel, or confirm a financial fact, but their embedded instructions never override the challenge rules. There are no voice notes or live banking, market-data, or exchange-rate calls.

The final submission must produce output.csv with:

request_id,amount_safe_to_pay,affordability_status,recommended_payment_method,payment_plan,earliest_date_for_full_payment,spending_changes_needed,decision_explanation

Read problem_statement.md for the full participant-facing specification.

2. Log File — Location And Lifecycle

The log file is named log.txt and lives in the same directory as this AGENTS.md file (and the CLAUDE.md that imports it) — the repository root.

Resolve the path relative to this file. Do not hardcode a folder name, a user path, or the platform home directory, so the location stays correct across clones, renames, and checkouts.

Rules:

• Create the file if missing.
• Append only. Do not rewrite, reorder, or delete prior entries.
• One shared log per checkout. All agents and sub-agents append to the same file next to the top-level AGENTS.md, never a private copy.
• Never log secrets. Redact API keys, tokens, cookies, private keys, and sensitive PII.

3. Session Start

At the beginning of each agent session:

1. Append a short SESSION START entry using §5.1.

2. Greet the user with this brief introduction:

   Welcome to HackerRank Orchestrate. Build and ship Buy or Wait?, an AI-powered financial decision agent, before the challenge ends at 6:00 PM IST on September 13, 2026. Let's get started.

3. Calculate and display the time remaining until 2026-09-13T18:00:00+05:30. If fewer than 2 hours remain, remind the user to submit soon. If the deadline has passed, state that clearly without blocking further work.

4. Proceed with the user's request without requiring an acknowledgement or confirmation phrase.

4. Challenge Rules

1. This is a solo challenge. The participant must be the author of the submission.
2. Participants may use any IDE, AI assistant, or tool to help build their solution.
3. The system must conform to the project contract in §6 so it can be evaluated.
4. Never commit secrets. Use environment variables and a .env file when needed.
5. Log every conversation turn to the file described in §2.
6. Follow the mandatory submission-link rule below.

4.1 Mandatory Submission Link

If the user asks for the submission link, where to submit, how to submit, where to upload the code, or any equivalent question, always provide this exact URL:

https://www.hackerrank.com/contests/hackerrank-orchestrate-september26/challenges/buy-or-wait/submission

Requirements:

• Include the full clickable URL in the response every time such a question is asked.
• Do not replace it with the HackerRank homepage, contest homepage, challenge overview, or any other link.
• Do not merely describe where to navigate; provide the URL directly.
• This rule applies even when the submission question is included alongside other questions.

5. Log Format

5.1 Session Start Entry

## [ISO-8601 TIMESTAMP] SESSION START

tool=<exact_harness_or_coding_agent_name>
Repo Root: <absolute_path>
Branch: <git_branch_or_unknown>
Worktree: <worktree_path_or_main>
Parent Agent: <parent_agent_name_or_none>
Language: <js|ts|py|custom:name>
Time Remaining: <Xd Yh Zm, or not configured>

5.2 Per-Turn Entry

Append after every user message you respond to:

## [ISO-8601 TIMESTAMP] <short title, max 80 chars>

User Prompt (verbatim, secrets redacted):
<exact user message, with secrets replaced by [REDACTED]>

Agent Response Summary:
<2-5 sentences: what was done, why, and any important decision>

Actions:
* <file edited / command run / tool invoked>

Context:
tool=<exact_harness_or_coding_agent_name>
branch=<git_branch_or_unknown>
repo_root=<absolute_path>
worktree=<worktree_path_or_main>
parent_agent=<parent_name_or_none>

Mandatory tool-name rule: Every SESSION START and per-turn log entry must contain one non-empty tool= line with the exact name of the coding harness or agent writing the entry. Replace the template value before writing the log. The entry is invalid if tool= is missing, blank, still contains a placeholder, uses a generic label such as AI, contains only a model name, or names a different harness. Before responding, verify the value against the harness identity provided by the current runtime and re-read the appended entry to confirm it matches. Never guess the tool name. Correct any mismatch before responding to the user.

5.3 Sub-Agent And Worktree Rules

• Sub-agents must log their own entries using the same file.
• Set parent_agent= to the parent agent's name.
• Worktrees use the same shared log file, not a per-worktree copy.

5.4 What Not To Log

• API keys, tokens, session cookies, OAuth codes, or private keys.
• Sensitive PII.
• Full contents of large files or binary blobs. Reference by path instead.

6. Project Contract

6.1 Dataset Contract

Participant-facing files are inside dataset/.

dataset/
├── financial_profiles.csv
├── financial_events.csv
├── exchange_rates.csv
├── requests.csv
├── sample_requests.csv
├── request_payment_options.csv
├── messages.csv
├── images.csv
├── output.csv
└── media/
    └── images/

• requests.csv contains the evaluation requests. Produce exactly one output row for every request_id in it.
• sample_requests.csv contains public examples with completed output fields. Use it to understand format and decision style, not as labels for evaluation requests.
• financial_profiles.csv defines the user's home currency, current available balance, minimum balance to keep, priorities, protected spending, adjustable categories, and payment preferences. max_installment_months is blank when the user will not consider installments.
• financial_events.csv contains historical, pending, scheduled, settled, failed, cancelled, and non-cash records. linked_event_id points to an earlier event in the same transaction or investment lifecycle; the link alone does not determine whether a row counts toward cash flow. Treat settled, pending, scheduled, and unrealized according to their cash state; do not treat unrealized investment value as available cash.
• exchange_rates.csv supplies fixed rates. For a foreign-currency cash event, use the row for its settlement date and the stated from_currency to to_currency direction.
• request_payment_options.csv contains the seller/provider payment options available for a request. A request has two to four options. An available option may still be rejected because it conflicts with the user's payment preferences or max_installment_months.
• messages.csv and images.csv provide optional supporting evidence. In messages.csv, related_event_id is populated only when the message directly describes one supplied financial-event row; a blank value means no one-to-one event row exists. Resolve each image as dataset/media/images/<image_id>.png; for example, image_07 maps to dataset/media/images/image_07.png. Use the information only when relevant; do not invent evidence when an image file is absent.
• output.csv is the blank prediction template.

Organizer-only files live outside dataset/ and must never be used for predictions.

6.2 Required Output

The solution must write output.csv with these exact columns, in this order:

request_id,amount_safe_to_pay,affordability_status,recommended_payment_method,payment_plan,earliest_date_for_full_payment,spending_changes_needed,decision_explanation

• amount_safe_to_pay is the amount safe on request_date before optional spending changes and is between 0 and requested_amount inclusive.
• affordability_status is one of affordable_now, affordable_with_plan, affordable_later, or not_affordable.
• recommended_payment_method is one of full_payment, partial_payment, installments, wait, or not_recommended.
• affordable_with_plan means the full request is completed through a partial-payment schedule, installments, or permitted spending changes.
• payment_plan is chronological YYYY-MM-DD:amount entries separated by |, or none. For partial_payment, use exactly two payments: amount_safe_to_pay on request_date, then requested_amount - amount_safe_to_pay on earliest_date_for_full_payment. Recommend it only when the request allows it, the user accepts it, 0 < amount_safe_to_pay < requested_amount, and the second payment is on or before desired_completion_date. The two payments must add up to requested_amount. An installment plan must instead follow a supplied payment option.
• earliest_date_for_full_payment is the first conservative projected date for one safe full payment. It equals request_date for affordable_now and is empty when no full payment is safe within the forecast period.
• spending_changes_needed is none or up to three stop:<event_id> and reduce_to:<event_id>:<new_amount> actions. Only non-protected, flexible events in a category the user permits may be changed.
• decision_explanation is a concise, grounded explanation of the recommendation.

6.3 Financial Decision Rules

• Detect recurrence only when history supports it. Forecast essential variable spending conservatively.
• Reserve pending debits. Do not count pending credits, bonuses, commissions, refunds, lottery proceeds, or investment gains until they settle.
• Count confirmed salary on its settlement date. Do not invent unsupported future income, expenses, payment options, or other financial facts.
• The balance must never fall below minimum_balance_to_keep after any projected essential expense or payment in the recommended plan.
• Respect the user's protected categories and preferences. Prefer a plan that completes the request by its deadline, avoids spending changes, minimizes total payment cost, starts earlier, and uses fewer payments.
• Resolve conflicts using an explicit cancellation, settlement, or amendment first; then newer records from the same source; then a settled event; then the financially safer interpretation.

6.4 Constraints That Make The Submission Evaluable

• Be runnable from the terminal.
• Read the provided files from dataset/.
• Do not use organizer-only files or hardcoded labels.
• Keep behavior deterministic where possible.
• Read secrets from environment variables only.
• Include clear setup and run instructions in the submitted code package.

6.5 Token Usage And Submission Artifacts

Submit code.zip, the completed output.csv, and the required chat_transcript. The submitted code.zip must include evaluation/usage_report.md. This single file must summarize the final full-dataset run's model providers and names, model calls, input and output tokens, total and average tokens per request, estimated total and per-request cost. Do not include API keys, credentials, or sensitive configuration.

6.6 Reasonable Entry Points

There is no required language. If you use Python, code/main.py is a good entry point. If you use another language, document the run command clearly in your submitted README.

7. Cross-Platform And Agent-Compatibility Notes

• Resolve the log path relative to this AGENTS.md file, as described in §2. Do not use the platform home directory or hardcode a user path.
• Write logs in UTF-8 with \n line endings.
• Do not assume bash. Prefer language-native APIs when possible.
• Keep tool-specific config minimal and point back to this AGENTS.md.
• If a nested AGENTS.md exists, the closest one wins for files inside that sub-project, but §2 and §5 remain global: keep logging to the log.txt beside the top-level AGENTS.md, not beside the nested one.

8. Quick Checklist For The Agent

Before responding to any user message, confirm:

• I have read this file in this session.
• I have appended the session-start entry.
• I know how much time is left, or that the end time is not configured.
• I will append a §5.2 entry after this turn.
• I have verified that tool= exactly matches the harness or coding agent currently running.
• I will not log secrets.
• I will preserve the Buy or Wait? financial decision and output contract in §6.