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Exam Code: CCA-F

Exam Name: Claude Certified Architect - Foundations

Certification Provider: Anthropic

Questions & Answers

Anthropic CCA-F Questions & Answers

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Questions & Answers

134 Questions & Answers with Testing Engine

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Anthropic CCA-F Practice Test 18

Question 170

A developer must change exactly one unique exception message in src/api/errors.ts, leaving all other code intact. The old string appears once and the replacement is fully specified. Which built-in tool should Claude Code favor?

  1. Write the entire file from memory, including all unchanged functions.
  2. Grep alone, because searching changes the matched line.
  3. Edit using the exact old text and the intended new text in the identified file.
  4. Delete the file and create a new one containing only the replacement message.

Explanation

Correct Answer

C:

Edit is suitable for a targeted replacement when the existing text is a unique, verified anchor. It changes the specified content without reconstructing the rest of the file. The agent should confirm the replacement matches once and inspect the diff to ensure no unintended lines changed. This matches the user's localized request and preserves surrounding imports and functions. If the match proves ambiguous, the agent should stop and inspect before using a broader strategy.

Incorrect Answers

A:

A full rewrite would re-create code that does not need modification and can accidentally alter surrounding logic. The existing string is a unique anchor, so a narrow replacement is safer. File-wide regeneration adds risk without value. The edit should preserve all unrequested behavior.

B:

Grep only locates content; it does not apply a replacement. A search can verify uniqueness, but the modification still needs a writing operation. Choosing a search tool as the final edit would leave the requested change undone. A separate change tool must perform the requested modification.

D:

The file contains more than the message, so deletion would destroy unrelated behavior. There is no requirement to replace the full implementation. A precise in-place edit is the appropriate operation for a unique text change. The unaffected functions remain necessary for application behavior.

Question 171

A Claude Code Edit attempt fails because the old text 'Invalid request' occurs repeatedly in a targeted source file and the replacement cannot identify the intended occurrence. The engineer has specified one error handler to modify. What should the agent do?

  1. Force an unrestricted replacement of every matching string throughout the repository.
  2. Read the exact source area, identify a unique contextual anchor, and make a controlled scoped edit or rewrite.
  3. Retry the same ambiguous Edit request indefinitely; a later attempt may match a different occurrence.
  4. Create a second errors.ts file in an arbitrary package to avoid changing the old one.

Explanation

Correct Answer

B:

The Edit failure is useful evidence that the original anchor was insufficiently specific. Inspect the intended handler's surrounding code and choose a unique replacement context or a carefully scoped file modification. After editing, compare the diff and run relevant tests to ensure other occurrences remain unchanged. This approach treats ambiguity as a reason to gather more source evidence, not permission to overwrite every matching message or invent a different target.

Incorrect Answers

A:

The same text can appear in unrelated handlers and tests, where changing it would be wrong. A global replacement ignores the engineer's limited scope. The agent must distinguish the specified function before writing. One function must be located uniquely before changes begin.

C:

Identical text and code produce the same ambiguity, so repetition does not add information. Blind retries can waste tool calls and obscure the precise failure. The agent needs a different, uniquely anchored operation after reading the context. Identical inputs cannot fix an insufficient anchor.

D:

Creating a duplicate file would not update the handler that the engineer identified. It could introduce conflicting modules or duplicate exports. The requested change must be applied to the correct source location with a verified scope. Existing references will continue pointing to the original implementation.

Question 172

After modifying a validation function, an engineer asks Claude Code to run the repository's approved unit tests and report actual failures. Which built-in tool best executes this authorized command?

  1. Grep, because it can locate unit test files and thus run them.
  2. Glob, because a path match validates test assertions.
  3. Bash, running the approved test command with appropriate working directory and timeout.
  4. Write a text file that says 'tests passed' without running the test suite.

Explanation

Correct Answer

C:

Bash is the built-in route for running shell commands such as the project's unit-test script when execution is authorized. The agent should use the documented command, check its exit code, and report failures from actual output rather than infer success from the presence of test files. A reasonable timeout and scoped working directory reduce the chance of accidental unrelated execution. Read and Grep may help investigate a failure afterward, but they cannot replace the test run itself.

Incorrect Answers

A:

Finding tests is useful for discovery, but Grep does not execute a test runner. The engineer requested results from an actual test invocation. A controlled command execution tool is required after confirming the approved command. Tool discovery and test execution are separate capabilities.

B:

A filename pattern cannot determine whether code passes assertions. It only enumerates files. Executing the test suite is a different operation and should use the project's documented command, not merely a path listing. A test file can exist even when its assertions fail.

D:

A fabricated test report provides no evidence of correctness and can mislead code reviewers. The requested verification requires the test process to execute. The agent should capture genuine exit status and failure diagnostics, including when the command cannot run. Evidence must include the executed command and exit status.

Question 173

A fixture generator has produced the full content for tests/fixtures/new-customer.json, and that file does not yet exist. The user authorized creating that fixture, not changing any current source files. Which built-in tool is appropriate?

  1. Edit, replacing an old string that cannot exist in the new file.
  2. Grep, because a successful search automatically creates the missing fixture.
  3. Write the complete new fixture at the authorized path and verify it was created correctly.
  4. Bash rm on the fixture directory followed by a guessed file structure.

Explanation

Correct Answer

C:

Write is appropriate when a full new file must be created and its target path is known. The agent should ensure the parent directory is correct, use the complete validated JSON content, and avoid overwriting unrelated files. After writing, it can read back or parse the fixture to confirm syntactic correctness and compare the diff to the authorized change. This preserves the distinction between creating a missing artifact and narrowly editing existing code.

Incorrect Answers

A:

Edit generally targets content already present so it can match and replace a known region. A nonexistent fixture has no anchor. The agent should create the file with the supplied complete content rather than fabricate a replacement target. File creation and content replacement have different prerequisites.

B:

Grep searches existing text and cannot create a new file. Even a no-match result only confirms absence within the searched scope. The requested operation is file creation, which requires an appropriate writing tool. Search output is not a filesystem write action.

D:

Deleting a directory is unrelated to creating one fixture and risks destroying existing test data. Guessing the content would also violate the fully specified input. A single authorized file creation is the proportionate action. It could erase data needed for other tests and fixtures.

Question 174

A legacy service exposes publicHandler through index.ts, which re-exports handlers.ts, which imports the actual processRequest implementation. A developer found the public symbol but needs the function that runs at runtime. What search strategy is most reliable?

  1. Stop at the first export statement because that is necessarily the function body.
  2. Grep for publicHandler definitions and references, then Read each export/import hop to the implementation.
  3. Write a new publicHandler implementation with the same name without checking existing imports.
  4. Search only package names using Glob and assume a matching package is the implementation.

Explanation

Correct Answer

B:

Symbol search reveals candidate declarations and usage sites; targeted reads show whether each file defines behavior or simply re-exports it. By tracing the chain through handlers.ts to processRequest, the agent can identify the true runtime entry point and its dependencies. This is more reliable than a single filename guess or a bulk read of the entire repository. The final analysis should cite concrete files and paths rather than infer control flow from naming conventions alone.

Incorrect Answers

A:

A barrel export often forwards a symbol without implementing the behavior. Treating the public surface as the runtime body would miss the imported implementation. The agent must follow the symbol through the export chain. The actual function may live in another module entirely.

C:

Creating an alternative definition can introduce conflicting exports and does not show what the current application executes. It may also break callers. The developer asked for tracing, not replacement or new code generation. Only the codebase can prove which definition is active.

D:

Directory or package names do not establish runtime function resolution. Re-export layers can lead to files in unexpected folders. Following symbol references and reading import/export statements is necessary to determine the actual implementation. Runtime resolution depends on imports, not a filename heuristic.

Question 175

A developer opens hundreds of files trying to find the exact error text 'unsupported settlement currency.' The repository is large and only a few modules contain that phrase. Which workflow is most efficient?

  1. Read the entire repository recursively into the model's context before applying any filters.
  2. Use Grep for the distinctive error phrase, then Read only the matching files and nearby context.
  3. Use Write to create a new file containing the error phrase, then search that file.
  4. Use Glob alone to find every file whose content contains that message.

Explanation

Correct Answer

B:

Grep can rapidly isolate the handful of source locations containing the specified text, including their file paths and line numbers. Read can then inspect the surrounding logic and dependencies necessary to understand the error. This two-step strategy minimizes irrelevant context while retaining grounded evidence for a patch or explanation. If no exact match appears, the agent can broaden the pattern deliberately rather than opening hundreds of files without a plan.

Incorrect Answers

A:

Most files are irrelevant to the error text, so this inflates context and may crowd out the needed code. Reading everything does not improve the precision of the initial discovery step. The agent should search for the actual phrase first.

C:

Creating an artificial match does not locate the real error in the existing codebase. It would contaminate search results and modify the workspace without authorization. The search must operate on actual repository content. The initial artificial result would also corrupt investigation evidence.

D:

Glob matches paths, not arbitrary strings inside source files. The error text need not appear in any filename. A content search is necessary before opening candidate files, making Grep the appropriate first tool. Path matching is not equivalent to searching source strings.

Question 176

An architect asks for a dependency map of the repository's packages and explicitly prohibits any edits. A code assistant has Read, Grep, Glob, Write, and Edit available. What should it do?

  1. Use discovery and read tools, and defer mutating operations entirely unless authorization changes.
  2. Edit package manifests while mapping them so dependency names are easier to read.
  3. Write a new lockfile to normalize transitive versions before reporting the current state.
  4. Delete generated files first to make the repository smaller for analysis.

Explanation

Correct Answer

A:

The requested output is an inventory, not a code modification. Glob can enumerate relevant manifests, Grep can identify import and dependency references, and Read can examine package files in context. The agent should not create, overwrite, or edit source files during this phase. Where possible, scope the role to read-only capabilities so the restriction is enforceable rather than only a textual intention. Any later remediation should require a separate authorized instruction.

Incorrect Answers

B:

Changing manifests would alter the system being analyzed and violate the explicit no-edit constraint. It could also introduce build regressions or confuse the inventory. The agent should report observed dependencies as they currently exist. Source observation must come before proposing modifications.

C:

Generating a lockfile is a workspace mutation and may change dependency resolution. The architect asked for the existing dependency graph, not a dependency refresh. Reading manifests and current lockfiles is sufficient for inventory. Inventory should describe the project as checked out.

D:

Cleanup is a side effect that has not been approved. Generated artifacts may be needed to understand build dependencies and deletion could break the workspace. Read-oriented inspection is the safe method for the requested map. It may also remove evidence important to the investigation.

Question 177

A developer sees app.dev.yaml, app.qa.yaml, and app.prod.yaml and needs to find which file enables feature X. Filenames alone cannot establish the setting. What combination of tools should be used?

  1. Use Grep for the filename suffix and assume the prod file has the feature enabled.
  2. Use Glob to discover candidate YAML paths, then Read those files to inspect the feature flag.
  3. Use Write to create a fourth YAML file with feature X enabled.
  4. Use Glob only, because filename matching automatically reveals all YAML property values.

Explanation

Correct Answer

B:

The first uncertainty is which similarly named configuration files exist, so path discovery via Glob is appropriate. The second uncertainty is the actual value of feature X within each file; Read resolves that by exposing the source content. Keeping those steps distinct prevents the model from mistaking naming conventions for evidence. The final answer should identify the exact file and setting, including any overlays or environment-specific overrides revealed by inspection.

Incorrect Answers

A:

A suffix tells the intended environment, not the value of a specific configuration field. Assuming production has feature X may produce an incorrect answer. The content of each candidate file needs inspection. A configuration value must be read from authoritative file contents.

C:

Creating a new configuration would change the repository rather than answer the developer's question. It would not reveal which existing environment already enables the feature. The task requires read-only discovery and verification. The actual answer lies in existing settings. Those settings must remain unchanged.

D:

Glob produces paths, not the internal key-value contents of configuration files. It can identify candidates but cannot determine whether feature X is true, false, or inherited. Read is necessary after discovery. This requires both file enumeration and content inspection. Paths provide only names.

Question 178

A CI failure mentions fixture 'pricing-tier-cases.json' but gives no directory. The repository contains many test fixtures, and the analyst should inspect the actual failing data without editing it. Which sequence is best?

  1. Use Glob to locate matching fixture paths, then Read the relevant candidate.
  2. Use Write to create a new file with that name in the project root.
  3. Delete all fixtures except the one with the matching filename.
  4. Assume the fixture is under tests/fixtures and report its values without checking.

Explanation

Correct Answer

A:

The error supplies a filename but not its directory, making path-pattern discovery the right first step. After identifying plausible matches, Read lets the analyst inspect the exact fixture content and compare it with the failed assertion. This avoids guessing a directory and avoids unauthorized changes while collecting evidence. If multiple candidates share the filename, the test path or import references should disambiguate which fixture the failing test actually loads.

Incorrect Answers

B:

A newly created fixture would not explain what the failing test currently reads. It might introduce an extra conflicting file. The analyst should inspect the existing referenced artifact, not create a substitute based on an error message. The existing referenced fixture remains the only grounded target.

C:

Filename matching alone cannot identify unrelated test artifacts as disposable. Deleting fixtures would damage test coverage and violate the read-only investigation. The agent needs targeted discovery followed by inspection. Even unrelated fixtures can be important to other tests and must remain untouched.

D:

Repositories often use multiple fixture directories or generated test data locations. Reporting guessed values is not evidence-based debugging. The path and contents should be verified through actual file reads before making claims. Only a verified file read can establish the stored values.

Question 179

A source file contains the same string in many places. A targeted Edit failed, and the maintainer authorized rewriting one specific file only. What safeguards should the assistant use when falling back to Write?

  1. Rewrite every matching file, because the string probably represents a project-wide policy.
  2. Read the complete target file, construct the minimal intended change, Write only that file, and compare its diff.
  3. Write an entirely new version from the model's memory without reading the current file.
  4. Skip the diff because Write always preserves bytes outside the changed region.

Explanation

Correct Answer

B:

When an Edit anchor cannot uniquely identify the intended change, a carefully controlled file rewrite may be necessary. The agent must first capture the target file's current contents, preserve unrelated code, and restrict Write to the authorized path. A post-write diff and relevant tests can detect accidental edits to neighboring functions or formatting. Other files must remain unchanged. This workflow treats Write as a narrower, deliberate fallback rather than license to regenerate the repository.

Incorrect Answers

A:

A repeated string does not imply that all occurrences share a requirement. The authorization is limited to one file. Broad rewrites may damage unrelated components and exceed the requested scope. Global changes would exceed the maintainer-approved boundary and risk unrelated behavior.

C:

Model memory can omit recent edits, comments, or imports, leading to accidental deletion of unrelated content. A valid fallback needs the current source as its reference. Reading first preserves the maintainer's requirement to leave other behavior intact. Local copies should be generated from the latest checked-out revision.

D:

Write can replace a complete file and therefore does not guarantee unchanged surrounding content. Without a diff, accidental omissions may go unnoticed. Verification is especially important when using a broader operation to replace an ambiguous Edit. Post-write verification is an essential safeguard against accidental deletions.

Question 180

A codebase search for getInvoice shows references in many files, but the runtime invocation is hidden behind re-exported wrappers. The engineer wants to trace the real implementation without changing code. Which THREE investigative steps are appropriate? (SELECT THREE)

  1. Use Grep to locate getInvoice symbol references and import/export statements.
  2. Use Write to create a replacement getInvoice implementation immediately.
  3. Read relevant implementations and their surrounding imports to understand call flow.
  4. Delete duplicate export files to reveal which implementation remains.
  5. Trace each barrel export and import reference until it resolves to the concrete runtime function.
  6. Assume the shortest filename is the runtime owner and ignore deeper wrappers.

Explanation

Correct Answers

A:

Grep can reveal which files define, call, or re-export the symbol, providing concrete paths for following the chain. It is the efficient content-discovery step when package names alone are insufficient. The resulting matches should be interpreted carefully because comments and type declarations can resemble runtime references. This information narrows the set of files that require a deeper Read. It does not, by itself, prove which function eventually executes.

C:

Search hits provide only fragments of the execution path. Reading the function body, imported dependencies, and control-flow context makes it possible to distinguish a public wrapper from the actual implementation. Targeted reads also reveal argument transformations and error paths that could alter runtime behavior. The investigation should cite these observed modules instead of assuming the first textual match is the operational endpoint.

E:

Re-export layers can conceal a function's location even after finding the public symbol. Following the chain through intermediary modules establishes which implementation is imported at runtime and which wrappers alter parameters or results. Combine the links found by Grep with file context from Read, documenting the path for later review. This step is distinct from mere symbol discovery: it resolves the actual dependency chain, avoiding a mistaken patch to a forwarding export.

Incorrect Answers

B:

The engineer asked for tracing rather than changing code. Creating another function could shadow the existing implementation and make investigation harder. The next steps should be read-only and based on current source evidence. Investigation must use the present implementation as evidence.

D:

Deleting files is destructive and would modify the module graph that is being investigated. The engineer has not authorized changes and duplicate-looking exports may be intentional. Read the import/export chain instead of altering it. The observed graph should be documented, not changed.

F:

File naming conventions are not a reliable indicator of execution order or symbol resolution. The shortest path may only expose the public API. Tracing should follow source imports to the real implementation rather than using superficial file attributes. Imports, not filename length, determine binding.

Claude Certified Architect - Foundations (CCA-F) Practice Tests