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GitHub Copilot is not one context system. Inline ghost-text completion, Copilot Chat, and agentic workflows gather different information, so the fix depends on which surface is producing the unhelpful result. First identify the surface, then provide Chat with explicit files or selections, add repository instructions for conventions that should persist, and check indexing, hosting, policy, and version setup.
The practical goal is not to make Copilot memorize an entire repository. It is to make the relevant context available to the feature you are using and to verify that its answer reflects that context.
Identify which Copilot experience is ignoring your code
Before changing settings, reproduce the problem and label the surface. A completion that appears while you type is governed by different context rules from a Chat answer, and an agentic workflow may have permission to inspect or edit files that ordinary completion never reads.
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| Surface | How context is used | Typical symptom | Best first action |
|---|---|---|---|
| Inline ghost-text completion | Predicts from code around the cursor and other context available to the editor. | A suggested line uses a generic pattern instead of a local helper, type, or convention. | Open the relevant definitions and confirm the file is in the intended project; do not expect inline completion to behave like a repository-wide question-answering tool. |
| Copilot Chat | Can use selected code, open files, project context, and wider codebase context when available. | An explanation or code change ignores a class, function, configuration file, or repository convention you expected it to know. | Open or select the relevant code, reference it with #file or #solution, and ask a narrow question naming the symbols or files. |
| Agentic workflow | Can read and edit files and use tools, subject to the IDE, account, repository, and policy configuration. | The agent changes the wrong file, fails to inspect a dependency, or reports that it cannot access part of the project. | Check the workflow’s available tools and permissions, then give an explicit task scope and verify the files it inspected. |
These surfaces are related but not interchangeable. A repository instruction file can establish conventions for supported interactions, but it cannot turn every inline prediction into a complete codebase analysis.
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Use this troubleshooting sequence
- Reproduce and record the scope. Note whether the failure occurs in inline completion, Chat, or an agentic workflow. Record the IDE and version, Copilot extension version, repository host, signed-in account or organization context, and whether the problem affects one file or the whole project. A one-file failure often points to missing local context; a project-wide failure calls for an instruction, indexing, policy, or setup check.
- Make Chat context explicit. Open the most relevant file, highlight the exact lines when possible, and add
#filereferences. Use#solutionwhen the question concerns the broader workspace. Name the files and symbols that must inform the answer, then ask one verifiable question. - Add persistent instructions when conventions are repeatedly missed. In VS Code, put repository-wide guidance in
.github/copilot-instructions.md. Put rules that apply only to particular paths in instruction files under.github/instructions. Confirm that custom instructions are enabled for the feature and IDE you are using. - Check repository indexing and hosting. If Chat cannot answer basic questions about structure or logic, determine whether a current semantic index is available for the repository and whether organization policy permits it. Hosting matters: GitHub’s enterprise documentation describes repository indexing as limited to GitHub.com and unavailable on GHE.com and GitHub Enterprise Server, while VS Code documentation also describes semantic indexing of local or other non-GitHub repositories when the capability is allowed. Do not assume that a setting available for one host applies to another.
- Verify the installation and account state. Make sure the Copilot extension and IDE are enabled, you are authenticated to the intended account, and both are current. GitHub’s IDE suggestions guidance recommends current VS Code and Copilot extension versions. Feature availability and configuration vary by IDE, plan, and organization policy.
- Retest with a controlled question. Use one known relevant file and one concrete question. Check whether the response reflects the selected lines, names the referenced symbol accurately, or follows an instruction that you deliberately included. If it still fails, preserve the prompt, response, IDE and extension versions, repository host, relevant policies, and a minimal reproduction for support.
When inline completions look generic
Understand what ghost text can see
Inline completion predicts what might come next at the cursor. Its strongest immediate signal is the code surrounding that position, along with other context the editor makes available. It is not the same as asking Chat to inspect a repository and explain its architecture. A completion can therefore be syntactically valid yet miss a project-specific helper or naming convention without indicating that the repository is broken.
Improve the local signal
- Put the cursor in the file and function where the code will be inserted, and keep the surrounding types, imports, and nearby examples visible.
- Open the definition or an existing implementation of the helper you want to use. This gives the editor and any context-aware feature a concrete local reference instead of relying on a generic pattern.
- State the intended behavior in nearby comments or code structure when that is part of your normal project practice; then judge the suggestion against the actual types and APIs in the file.
- If the question is “which existing module handles this?” switch to Chat and reference the relevant files. Do not try to solve a repository-navigation question solely with ghost text.
When a completion remains wrong, treat it as a prediction to accept, edit, or reject rather than proof that Copilot has indexed the project incorrectly. Use Chat or an agentic feature for deliberate inspection and edits.
Give Copilot Chat the files it must use
Open, select, and reference the evidence
GitHub recommends making relevant context explicit. Open the file that defines the behavior, select the lines that matter, and reference files with #file. Use #solution when the answer depends on the wider solution or workspace. These references are a request to use concrete project material; they are more reliable than a broad prompt such as “understand my repository.”
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Ask a narrow, checkable question
A useful prompt states the decision you need and the evidence Copilot should inspect. For example:
Using #file:src/auth/session.ts and #file:src/api/client.ts, explain which function refreshes an expired token. Quote the symbol names you relied on and identify the file where a retry should be added.For a change request, specify the allowed scope and a verification step:
Using #file:src/orders/service.ts and #file:tests/orders/service.test.ts, propose the smallest change that handles a cancelled order. Do not edit unrelated files. List the existing test that should be extended.The exact file names in these examples are illustrative; replace them with files from your project. The important elements are explicit references, a focused question, and a requested explanation that you can verify.
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Check whether the answer actually used the context
- Does it name the class, function, type, or configuration key that appears in the referenced file?
- Does it distinguish the implementation from a similarly named test, generated file, or documentation example?
- Does its proposed change fit the imports, error handling, and build commands used by the project?
- When you ask for a location, does it identify a real path rather than an invented one?
If the response fails these checks, repeat the question with fewer files and more precise references. A smaller, verifiable context is usually more useful than an unbounded request to read everything.
Use repository instructions for conventions that should persist
Repository-wide guidance in VS Code
Create .github/copilot-instructions.md at the repository level for conventions that should apply across the project. Useful content includes architecture boundaries, terminology, required build and test commands, error-handling rules, generated-file warnings, and the preferred style for APIs or database changes.
# Project conventions
- Keep HTTP handlers thin; put business rules in the service layer.
- Run the unit tests with the repository's documented test command before proposing a behavior change.
- Do not edit generated files; update their source definitions instead.
- Use the project's existing error type for request validation.
- Refer to the persistence layer as the repository layer in explanations.This is guidance, not a guarantee. GitHub notes that custom instructions provide useful context but Copilot may not follow them identically in every response. Keep the file specific and short enough to remain actionable, and verify that custom instructions are enabled in the applicable VS Code and Copilot configuration.
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Path-specific guidance
Use instruction files under .github/instructions when a rule applies only to a path or kind of file. For example, frontend components may have different conventions from database migrations. Path-specific instructions prevent a rule for one area from being treated as a repository-wide requirement.
- Put cross-cutting architecture and terminology rules in
.github/copilot-instructions.md. - Put rules tied to a directory, language, or file type under
.github/instructions. - State the scope and the command or example that demonstrates the rule.
- Remove stale guidance when the build system, directory layout, or terminology changes.
- After editing instructions, run a focused Chat test that asks Copilot to apply one rule to a known file.
Check semantic indexing, repository host, and policy
Why indexing affects repository questions
A current semantic index helps Copilot answer questions about relationships that are not visible in the active editor, such as where an interface is implemented or which module calls a service. If Chat cannot answer even basic structure or logic questions, indexing availability is one of the first project-level checks after explicit file references.
Do not assume every host is eligible
Repository context is affected by where the code is hosted and by organization policy. GitHub’s enterprise documentation says the repository-indexing capability is limited to GitHub.com and unavailable on GHE.com and GitHub Enterprise Server. VS Code documentation also describes semantic indexing for local or other non-GitHub repositories when policy allows it. These statements describe different deployment and policy conditions, so check the documentation and settings for your exact IDE, host, and organization rather than copying a setting from another environment.
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Use a controlled test
- Ask Chat a question whose answer is a distinctive symbol in a known file, such as the only implementation of an interface.
- Reference that file explicitly with
#fileand compare the result with the same question without the reference. - If the explicit reference works but the repository-wide question fails, suspect indexing availability, stale index data, host restrictions, or policy rather than the code itself.
- If even the explicit reference fails, return to authentication, extension version, IDE support, and the selected file or workspace.
Verify IDE, extension, account, and organization settings
GitHub’s IDE suggestions guidance recommends using current VS Code and Copilot extension versions. Update through the IDE’s normal extension and application channels, then restart or reload the window if the IDE requests it. Confirm that the Copilot feature is enabled, the account shown by the IDE is the account with access to the repository, and organization policies have not disabled a feature or context source.
Feature names and controls vary by IDE. A path documented for VS Code should not be presented as a universal path for every editor. If you work in another IDE, locate its current Copilot settings and instruction-file guidance before adding files or changing policies. A successful sign-in alone does not prove that every Chat, indexing, or agentic capability is enabled for your plan and organization.
Choose the fix that matches the problem
| Need | Best mechanism | Scope | What to verify |
|---|---|---|---|
| Predict the next line while typing | Inline completion | Code near the cursor and other editor-available context | The local types, imports, and examples support the suggestion. |
| Explain or change a known piece of code | Chat with selected or open files and #file references |
Transient context for the current interaction | The answer names and reflects the referenced symbols and paths. |
| Ask about the wider solution | Chat with #solution, when supported and available |
Broader workspace or solution context | The repository host, policy, and indexing capability allow the requested context. |
| Apply conventions repeatedly | Repository-wide instructions in .github/copilot-instructions.md |
Persistent repository guidance in VS Code | Custom instructions are enabled and the response follows the rule in a test case. |
| Apply rules only to a directory or file type | Path-specific files under .github/instructions |
Persistent, path-scoped guidance in VS Code | The instruction’s scope matches the file being discussed. |
| Inspect and edit several files with tools | Agentic workflow | Files and tools exposed by that workflow | The agent has permission to read or edit the intended paths and reports what it changed. |
Common failure patterns and targeted fixes
| What you observe | Most useful next check | Targeted fix |
|---|---|---|
| Inline text ignores a project helper. | Whether the helper’s definition and type are visible near the cursor. | Open the definition or use Chat with an explicit file reference; do not rely on inline prediction for repository discovery. |
| Chat gives a generic answer despite a known implementation. | Whether the relevant file is open, selected, or referenced with #file. |
Ask one narrow question naming the file and symbol, then check the answer against those lines. |
| Many Chat responses miss the same architecture rule. | Whether VS Code custom instructions are enabled and the rule is in the correct file. | Add or revise .github/copilot-instructions.md, or move a directory-only rule into .github/instructions. |
| Repository-wide questions fail, but explicit file questions work. | Semantic-index availability, index freshness, repository host, and organization policy. | Check the supported host and policy; use explicit file references when broad indexing is unavailable. |
| The documented setting or instruction path is missing. | IDE, extension, plan, and release differences. | Use the current guidance for that IDE and confirm the feature is enabled for the account and organization. |
| An agent edits an unexpected file. | The workflow’s tool permissions and the task’s stated scope. | Specify allowed files, require a change list, and review the proposed edits before accepting them. |
Prepare a useful support report if the problem persists
Do not report only that Copilot is “ignoring the codebase.” Include the surface, a minimal prompt, the expected file or symbol, the actual response, IDE and extension versions, repository host, account or organization context, relevant settings and policies, and whether explicit #file references changed the result. State whether the failure is limited to one file or occurs across the project. This information separates a context-selection problem from an indexing, hosting, configuration, or feature-availability problem.
Keep the reproduction small: one known file, one concrete question, and one expected fact. Remove secrets and proprietary content before sharing it. A precise reproduction is more actionable than a long transcript containing unrelated prompts.
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