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Can You Use Documentation During a Coding Assessment? Platform and Company Rules

Can you use documentation in a coding assessment? Compare CodeSignal, HackerRank, Codility, and CoderPad rules before opening a resource safely.

Sometimes, but only when the rules for your specific assessment permit it. A coding assessment is not automatically open book just because it runs in a browser. One platform may allow official syntax documentation, another may let the employer decide, and a secure test may record or block every attempt to leave the assessment.

The safest rule is simple: read the invitation and the final pre-test policy, distinguish syntax reference from solution help, and ask the recruiter before the timer starts if anything material is unclear.

Quick answer: Can you use documentation during a coding assessment?

You can use documentation only when the assessment rules expressly allow it. “Documentation” may mean an official language or library reference, not tutorials, solved examples, Stack Overflow answers, AI assistants, another person, or a second device.

The platform name alone is not enough to answer the question. CodeSignal's General Coding Assessment, for example, permits syntax-reference searches but prohibits searches that help derive the solution. Codility tells candidates to check the assessment policy set by the testing organization. HackerRank offers several integrity modes, from activity tracking to a locked desktop app. CoderPad can expose built-in tools, including AI Assist, when the employer enables them.

Use this hierarchy when two signals appear to conflict:

The rules displayed for the exact assessment session.
Written instructions in the employer's invitation.
A written clarification from the recruiter or test administrator.
General platform documentation.

Never assume that a feature being technically available means the employer has authorized it.

Why “open book” is not one rule

Candidates often combine five separate permissions into one question: Can I view language docs? Can I search the web? Can I use my own IDE? Can I consult AI? Can I ask another person? Those permissions can differ inside the same test.

An employer might allow Python's standard-library documentation while prohibiting general search. Another might permit an external IDE but disallow autocomplete plugins. A project assessment may intentionally provide an AI assistant, while a standardized algorithm test prohibits AI entirely. Open book does not mean open assistance.

Platform rules: CodeSignal, Codility, HackerRank, and CoderPad

The table below describes current public platform guidance as of August 2026. Employers can configure custom assessments, so your on-screen rules remain authoritative.

Platform or format	What current guidance says	Practical candidate rule
CodeSignal Certified Assessments	The GCA permits online searches for syntax reference, but not resources that provide solution logic; AI is not allowed for that assessment. Most CodeSignal assessments require the cloud IDE.	Use official syntax or API references only when the session rules permit them. Do not use an outside IDE, AI, or solved examples unless explicitly authorized.
Codility	Candidates must work alone. Whether books, websites, or other resources are permitted is determined by the testing organization.	Read the assessment policy in the test link. Ask the administrator before starting if the resource rule is missing.
HackerRank	Employers choose integrity settings. Standard tests can track tab exits and copy-paste; Secure, Proctor, and Desktop App modes can add full-screen enforcement, screen monitoring, or application blocking.	Do not leave the test to open documentation unless the instructions allow it. A normal browser test is not proof that outside resources are permitted.
CoderPad Screen or Interview	The environment and tools vary by question and employer. Project exercises can include a full VS Code workspace and an enabled built-in AI assistant; live pads can also expose AI Assist.	Use the tools enabled inside the pad, then confirm acceptable use with the interviewer or instructions. Built-in AI being visible is not permission to use an unrelated external AI tool.

CodeSignal: syntax reference is narrower than solution research

CodeSignal gives one of the clearest public examples. Its GCA rules allow candidates to check how a language operation works, such as inserting into a C++ queue. The same rules prohibit opening a page that explains how to implement the data structure being tested.

That creates a useful boundary. Looking up a method signature, return type, or standard-library name can be syntax reference. Searching the prompt wording, an algorithm pattern, a complete implementation, or “best solution” is solution assistance. CodeSignal also says most assessments require its cloud IDE rather than an external IDE.

Codility: the testing organization sets the resource policy

Codility's candidate guidance says you must work independently and may not consult another person. For books and websites, its official answer is to review the policy included with the test or ask the test administrator.

HackerRank: monitoring settings can change what is possible

HackerRank documents several test integrity modes. Basic controls can record copy-paste and tab activity. Secure Mode can enforce full screen and block copy-paste, while Proctor Mode adds broader monitoring. Desktop App Mode can prevent candidates from opening other applications.

These capabilities do not prove that every HackerRank test bans documentation. They show that HackerRank is configurable. If a test prohibits tab switching or external tools, opening official docs in another tab still violates that instruction.

CoderPad: realistic tools may be part of the evaluation

CoderPad increasingly supports project-style work. Its candidate project guide describes a VS Code environment with instructions, a terminal, and optional AI Assist. When AI is enabled, CoderPad tells candidates to use the built-in assistant rather than external tools, and the interaction can be available for review.

For a live interview, ask before using anything outside the pad. One interviewer may welcome API verification; another may want a closed-book fundamentals check.

What counts as documentation, and what crosses the line?

The content of the resource matters more than its branding. An official website can contain both a neutral API reference and a tutorial that effectively solves the task.

Resource	Typical risk level	Use it only when...
Official language or standard-library reference	Lower	Syntax documentation is allowed and the page does not solve the problem.
Framework or database API documentation	Lower to medium	The assessment permits external docs and the task expects that framework.
Personal notes or a printed cheat sheet	Medium	Notes are expressly allowed; “no internet” does not automatically mean notes are permitted.
Stack Overflow, tutorials, or blog posts	High	General web research is allowed and the page does not reveal the requested solution.
GitHub repositories or copied code	Very high	The assessment explicitly allows reuse and licensing requirements are satisfied.
ChatGPT, Copilot, or another AI assistant	Prohibited by default	The employer explicitly authorizes that tool or provides an enabled built-in assistant.
Another person, group chat, or paid answer service	Prohibited	The assessment is explicitly collaborative, which is rare for an asynchronous screen.

Company rules override platform defaults

Assessment platforms provide capabilities; employers choose the evaluation. A company can create a custom CodeSignal test, configure a HackerRank integrity mode, enable CoderPad AI Assist, or attach its own Codility policy. The resulting rules may be stricter or more permissive than a generic help article.

Before launching the timer, confirm:

Whether official documentation, general search, personal notes, AI, and an external IDE are allowed.
Whether the test requires full screen, screen sharing, webcam access, one monitor, or a desktop application.
Whether you may pause or revisit submitted work, and who handles policy questions.

If the invitation says “open book,” ask what that includes. A one-sentence clarification is better than hoping a reviewer interprets an activity log generously.

A safe decision flow before you open any resource

Start with the exact rule, not the resource you hope to use. If the rule explicitly allows official documentation, open a direct reference page and search only for the missing syntax. If the rule allows general internet use, avoid prompt searches, complete solutions, and external AI unless those are separately authorized.

If the rule is silent, do not infer permission from the absence of a lock. Ask before the test. If the timer has started, stay inside the assessment and use only clearly permitted built-in help.

Here is a concise email you can send before starting:

Hi [Name], before I begin the coding assessment, could you confirm the resource policy? Specifically, may I use official language or library documentation, and is an external IDE or AI assistance permitted? I will follow the instructions shown in the assessment if they are more specific. Thank you.

How to use permitted documentation without wasting time

Documentation can still hurt your score if every lookup becomes a five-minute detour. Prepare a narrow lookup strategy before test day.

Choose one language and know its core collections, sorting APIs, string operations, heap behavior, and complexity costs. Practice direct reference queries such as “Python bisect_left signature,” then return to the code as soon as the forgotten detail is resolved.

Use a two-minute rule. If the reference does not answer the syntax question quickly, implement a simpler alternative you understand.

Frequently asked questions

Is a CodeSignal assessment open book?

Not universally. CodeSignal's GCA allows syntax-reference searches but prohibits resources that help with solution logic, and it does not allow AI for that assessment. Other CodeSignal assessments can have different rules. Read the policy displayed for the exact session before the timer starts.

Does HackerRank allow documentation during a test?

HackerRank does not impose one public documentation rule for every employer test. The company configures the assessment and integrity mode. If the instructions allow documentation, follow that scope; if they prohibit tab switching or external tools, do not leave the test to open documentation.

Can I use Stack Overflow during a coding assessment?

Only when the assessment permits general web resources and the page does not provide the solution being evaluated. Even then, official API documentation is usually easier to defend and faster to use. Never search the exact prompt or copy an implementation from an answer.

Can I use my own IDE or autocomplete?

It depends on the assessment. CodeSignal says most of its assessments require the cloud IDE. Project tests may deliberately provide a fuller workspace. Browser extensions and AI-powered autocomplete can create separate policy issues, so disable them unless the instructions explicitly allow them.

What should I do if the documentation rule is unclear?

Ask the recruiter or test administrator before launching the assessment. Name the exact resource categories: official docs, general web search, personal notes, external IDE, and AI. If the timer has already started, use only the tools clearly available and permitted inside the assessment.

Final takeaway

You can use documentation during a coding assessment only when the test-specific rules authorize it. CodeSignal may allow syntax reference, Codility may defer to the employer, HackerRank may track or block external activity, and CoderPad may intentionally provide built-in tools. None of those platform patterns replaces the instructions in your invitation.

Sources and Further Reading

Research note: This guide was checked on August 25, 2026. Platform features and employer policies can change, so the rules shown in your own invitation and assessment session remain the source of truth.