Claude Code: foundations, built-in tools and features, workflows, customization, and integrations.http://localhost:4321/http://localhost:4321/claude-code/advanced-prompting-strategies/http://localhost:4321/claude-code/advanced-prompting-strategies/Specificity, examples, role/context priming, anti-patterns. How to phrase a task so Claude Code does it well the first time.Sat, 30 May 2026 00:00:00 GMTIntermediateconceptFoundationspromptingcommunicationspecificityexampleshttp://localhost:4321/claude-code/claude-code-best-practices/http://localhost:4321/claude-code/claude-code-best-practices/The consolidated playbook. The 15 highest-leverage habits, with cross-links to the writeups they expand on.Sat, 30 May 2026 00:00:00 GMTFoundationalconceptFoundationsbest-practiceschecklistplaybookhabitshttp://localhost:4321/claude-code/guiding-the-conversation/http://localhost:4321/claude-code/guiding-the-conversation/When to interrupt, when to let it cook, how to course-correct without scrapping context. The Esc-then-corrected-message rhythm.Sat, 30 May 2026 00:00:00 GMTIntermediateworkflowWorkflowsworkflowsteeringmid-taskcorrectionshttp://localhost:4321/claude-code/bug-hunting-and-root-cause/http://localhost:4321/claude-code/bug-hunting-and-root-cause/Reproducing, isolating, root-causing, fixing, and writing the regression test. The structured loop for not-just-making-it-go-away.Sun, 17 May 2026 00:00:00 GMTIntermediateworkflowWorkflowsworkflowdebuggingroot-causeregression-testhttp://localhost:4321/claude-code/app-mcps-slack-gmail-drive/http://localhost:4321/claude-code/app-mcps-slack-gmail-drive/First-party MCP integrations to common SaaS apps. Auth flow, scope, and the privacy considerations before turning each one on.Sun, 17 May 2026 00:00:00 GMTFoundationalintegrationIntegrationsmcpslackgmailgoogle-drivecalendaroauthhttp://localhost:4321/claude-code/building-an-mcp-server/http://localhost:4321/claude-code/building-an-mcp-server/Writing a custom MCP server in TypeScript or Python. Tools, resources, prompts, and the JSON-RPC contract.Sun, 17 May 2026 00:00:00 GMTAdvancedintegrationIntegrationsmcpcustom-integrationtypescriptpythonjson-rpchttp://localhost:4321/claude-code/building-a-security-hook/http://localhost:4321/claude-code/building-a-security-hook/End-to-end recipe for a hook that blocks dangerous commands and writes an audit log. The threat model and the test plan.Sun, 17 May 2026 00:00:00 GMTAdvancedworkflowCustomizationsecurityhooksauditthreat-modelhttp://localhost:4321/claude-code/context-window-and-token-budget/http://localhost:4321/claude-code/context-window-and-token-budget/What lives in context, what gets summarized, what falls out — and how to plan a long session so the model still has what it needs.Sun, 17 May 2026 00:00:00 GMTIntermediateconceptFoundationscontext-windowtokenslong-sessionscosthttp://localhost:4321/claude-code/code-review-workflow/http://localhost:4321/claude-code/code-review-workflow/Using Claude Code as a reviewer, getting a second opinion on a migration, and where /ultrareview fits in the cycle.Sun, 17 May 2026 00:00:00 GMTIntermediateworkflowWorkflowsworkflowcode-reviewpr-reviewsecond-opinionhttp://localhost:4321/claude-code/claude-md-and-memory/http://localhost:4321/claude-code/claude-md-and-memory/Project-scoped instructions, auto-loaded memory, and the per-user memory system. The highest-leverage customization point.Sun, 17 May 2026 00:00:00 GMTFoundationalfeatureFoundationsmemoryclaude-mdcustomizationhttp://localhost:4321/claude-code/conversation-driven-development/http://localhost:4321/claude-code/conversation-driven-development/The core workflow — state intent, watch Claude propose, accept or redirect. Why this beats prompt-and-hope.Sun, 17 May 2026 00:00:00 GMTFoundationalworkflowWorkflowsworkflowconversationdaily-driverhttp://localhost:4321/claude-code/custom-status-line/http://localhost:4321/claude-code/custom-status-line/Authoring a status-line script. Reading session metadata, formatting output, and the refresh cadence.Sun, 17 May 2026 00:00:00 GMTIntermediatefeatureCustomizationstatus-linecustomizationergonomicsobservabilityhttp://localhost:4321/claude-code/custom-sub-agents/http://localhost:4321/claude-code/custom-sub-agents/Defining a sub-agent with a tool allowlist, a system prompt, and an invocation pattern. When a sub-agent beats a slash command.Sun, 17 May 2026 00:00:00 GMTIntermediatefeatureCustomizationsub-agentscustomizationparallelismcontexthttp://localhost:4321/claude-code/file-tools-read-edit-write/http://localhost:4321/claude-code/file-tools-read-edit-write/The three primary file tools. When to use each, the read-before-edit invariant, and why Edit is preferred over Write for existing files.Sun, 17 May 2026 00:00:00 GMTFoundationalfeatureTools & Featuresfile-toolsreadeditwriteconventionshttp://localhost:4321/claude-code/github-integration/http://localhost:4321/claude-code/github-integration/Using `gh` for issues, PRs, and reviews from inside Claude Code. The committing checklist and the PR-creation workflow.Sun, 17 May 2026 00:00:00 GMTFoundationalintegrationIntegrationsgithubgh-clipull-requestscode-reviewgithttp://localhost:4321/claude-code/headless-non-interactive-mode/http://localhost:4321/claude-code/headless-non-interactive-mode/Running Claude Code in CI, in scripts, and in cron-style autonomous loops. JSON output, exit codes, and timeouts.Sun, 17 May 2026 00:00:00 GMTAdvancedworkflowWorkflowsworkflowheadlessciautomationscriptinghttp://localhost:4321/claude-code/hooks-overview/http://localhost:4321/claude-code/hooks-overview/Event-driven shell hooks that fire on tool calls and prompt submission. The four event types and where each one is the right tool.Sun, 17 May 2026 00:00:00 GMTIntermediatefeatureTools & Featureshooksautomationcustomizationhttp://localhost:4321/claude-code/install-and-first-run/http://localhost:4321/claude-code/install-and-first-run/Installing the CLI, signing in, picking a model, and running your first conversation against a repository.Sun, 17 May 2026 00:00:00 GMTFoundationalconceptFoundationsfoundationsinstallonboardingclihttp://localhost:4321/claude-code/long-running-sessions/http://localhost:4321/claude-code/long-running-sessions/How to run a multi-hour session without losing the thread. Summarisation, plan files, memory writes, and the cache-friendly cadence.Sun, 17 May 2026 00:00:00 GMTAdvancedworkflowWorkflowsworkflowcontext-managementlong-sessionsmemoryhttp://localhost:4321/claude-code/jetbrains-extension/http://localhost:4321/claude-code/jetbrains-extension/Running Claude Code inside IntelliJ-family IDEs. Feature parity with VS Code and the IDE-specific affordances.Sun, 17 May 2026 00:00:00 GMTFoundationalintegrationIntegrationsjetbrainsintellijideplugindiagnosticshttp://localhost:4321/claude-code/mcp-servers-overview/http://localhost:4321/claude-code/mcp-servers-overview/The Model Context Protocol — what MCP is, how Claude Code talks to MCP servers, and the difference between local and remote servers.Sun, 17 May 2026 00:00:00 GMTIntermediateintegrationIntegrationsmcpintegrationsprotocolhttp://localhost:4321/claude-code/pair-programming-patterns/http://localhost:4321/claude-code/pair-programming-patterns/Driver-navigator, ping-pong, and explain-as-you-go. How to keep yourself in the loop while Claude does the typing.Sun, 17 May 2026 00:00:00 GMTFoundationalworkflowWorkflowsworkflowpair-programmingcollaborationdaily-driverhttp://localhost:4321/claude-code/plan-mode/http://localhost:4321/claude-code/plan-mode/Read-only research mode for designing changes before touching the codebase. When to enter, how to write a good plan, when to exit.Sun, 17 May 2026 00:00:00 GMTFoundationalfeatureFoundationsplan-modeplanningpermissionsworkflowhttp://localhost:4321/claude-code/permission-modes/http://localhost:4321/claude-code/permission-modes/Default, accept-edits, plan, bypass — what each mode allows, when to use it, and how it interacts with allowlists.Sun, 17 May 2026 00:00:00 GMTFoundationalconceptFoundationspermissionssafetymodesallowlistshttp://localhost:4321/claude-code/permission-rules-and-allowlists/http://localhost:4321/claude-code/permission-rules-and-allowlists/Auto-approving safe Bash commands, denying risky ones, and the project-scoped allowlist file.Sun, 17 May 2026 00:00:00 GMTIntermediatefeatureCustomizationpermissionsallowlistsafetysettingshttp://localhost:4321/claude-code/pretooluse-and-posttooluse-hooks/http://localhost:4321/claude-code/pretooluse-and-posttooluse-hooks/Intercepting and reacting to tool calls. Common patterns: linting after edits, logging Bash commands, blocking dangerous operations.Sun, 17 May 2026 00:00:00 GMTIntermediatefeatureCustomizationhooksautomationsafetylintinghttp://localhost:4321/claude-code/search-tools-grep-and-glob/http://localhost:4321/claude-code/search-tools-grep-and-glob/Fast targeted search across the repository. When to prefer Grep over Bash-ripgrep, when to delegate broader searches to an Explore agent.Sun, 17 May 2026 00:00:00 GMTFoundationalfeatureTools & Featuresgrepglobsearchripgrepexplorehttp://localhost:4321/claude-code/settings-and-configuration/http://localhost:4321/claude-code/settings-and-configuration/settings.json layers (user, project, local), env vars, model selection, and the configuration precedence rules.Sun, 17 May 2026 00:00:00 GMTFoundationalfeatureFoundationssettingsconfigurationprecedenceenv-varshttp://localhost:4321/claude-code/refactoring-with-claude-code/http://localhost:4321/claude-code/refactoring-with-claude-code/Small refactors, large refactors, and the heuristics for when to split into a series of PRs versus one bundled change.Sun, 17 May 2026 00:00:00 GMTIntermediateworkflowWorkflowsworkflowrefactoringmigrationspr-strategyhttp://localhost:4321/claude-code/skills/http://localhost:4321/claude-code/skills/Bundled prompt + tool + instruction packages that Claude Code can invoke. How they differ from sub-agents and custom slash commands.Sun, 17 May 2026 00:00:00 GMTIntermediatefeatureTools & Featuresskillsworkflowscustomizationslash-commandshttp://localhost:4321/claude-code/slash-commands/http://localhost:4321/claude-code/slash-commands/Built-in slash commands (/help, /clear, /loop, /ultrareview, /schedule), and the ones you'll use most as a daily driver.Sun, 17 May 2026 00:00:00 GMTFoundationalfeatureTools & Featuresslash-commandsclishortcutsworkflowshttp://localhost:4321/claude-code/sub-agents/http://localhost:4321/claude-code/sub-agents/Specialised agents (Explore, Plan, claude-code-guide, general-purpose). Parallel and isolated execution, when to delegate, and context-window protection.Sun, 17 May 2026 00:00:00 GMTIntermediatefeatureTools & Featuressub-agentstaskdelegationcontext-isolationhttp://localhost:4321/claude-code/test-driven-development/http://localhost:4321/claude-code/test-driven-development/Writing tests first, letting Claude implement against them, and the feedback loop that makes it reliable on non-trivial features.Sun, 17 May 2026 00:00:00 GMTIntermediateworkflowWorkflowsworkflowtddtestingfeedback-loophttp://localhost:4321/claude-code/the-bash-tool/http://localhost:4321/claude-code/the-bash-tool/Running shell commands, persistent working directory, parallel execution, background jobs, and the sandbox model.Sun, 17 May 2026 00:00:00 GMTFoundationalfeatureTools & Featuresbashshellbackgroundsandboxparallelhttp://localhost:4321/claude-code/the-claude-agent-sdk/http://localhost:4321/claude-code/the-claude-agent-sdk/Programmatic Claude agents from Python or TypeScript. When the SDK beats the CLI, and how it shares conventions with Claude Code.Sun, 17 May 2026 00:00:00 GMTAdvancedfeatureCustomizationsdkagentpythontypescriptautomationhttp://localhost:4321/claude-code/the-conversation-loop/http://localhost:4321/claude-code/the-conversation-loop/How Claude Code reads, plans, calls tools, and emits text — the loop that makes everything else make sense.Sun, 17 May 2026 00:00:00 GMTFoundationalconceptFoundationsfoundationsloopagentmental-modelhttp://localhost:4321/claude-code/the-task-tool/http://localhost:4321/claude-code/the-task-tool/Running long operations in the background, getting notified on completion, and the no-polling rule that makes this fast.Sun, 17 May 2026 00:00:00 GMTIntermediatefeatureTools & Featurestaskbackgroundasyncnotificationssub-agentshttp://localhost:4321/claude-code/the-status-line/http://localhost:4321/claude-code/the-status-line/Customising the always-visible status line — model, branch, token usage, custom indicators. Useful for long sessions.Sun, 17 May 2026 00:00:00 GMTIntermediatefeatureTools & Featuresstatus-lineuicustomizationlong-sessionshttp://localhost:4321/claude-code/todowrite-and-task-management/http://localhost:4321/claude-code/todowrite-and-task-management/The built-in task list. When to use it, when not to, and how it interacts with sub-agent task tracking.Sun, 17 May 2026 00:00:00 GMTFoundationalfeatureTools & Featurestodowritetask-listplanningsub-agentshttp://localhost:4321/claude-code/userpromptsubmit-hooks/http://localhost:4321/claude-code/userpromptsubmit-hooks/Hooks that fire when the user submits a prompt. Use cases: redaction, secret-scrubbing, injecting context, audit logging.Sun, 17 May 2026 00:00:00 GMTIntermediatefeatureCustomizationhookssecuritycontext-injectionaudithttp://localhost:4321/claude-code/webfetch-and-websearch/http://localhost:4321/claude-code/webfetch-and-websearch/Pulling content from a URL or searching the web from inside a session. Caching, content extraction, and where the limits sit.Sun, 17 May 2026 00:00:00 GMTFoundationalfeatureTools & Featureswebfetchwebsearchwebhttpresearchhttp://localhost:4321/claude-code/vs-code-extension/http://localhost:4321/claude-code/vs-code-extension/Running Claude Code inside VS Code. Diagnostics, inline diffs, and the split between IDE and terminal sessions.Sun, 17 May 2026 00:00:00 GMTFoundationalintegrationIntegrationsvs-codeideextensiondiagnosticsdiffshttp://localhost:4321/claude-code/writing-custom-slash-commands/http://localhost:4321/claude-code/writing-custom-slash-commands/Authoring a slash command from a markdown file. Argument handling, model selection, and team-shared command libraries.Sun, 17 May 2026 00:00:00 GMTIntermediatefeatureCustomizationslash-commandscustomizationworkflowsteam-toolshttp://localhost:4321/claude-code/what-is-claude-code/http://localhost:4321/claude-code/what-is-claude-code/An agentic coding tool, not a chat box. How Claude Code differs from a code-completion assistant and from a raw chat model.Sun, 17 May 2026 00:00:00 GMTFoundationalconceptFoundationsfoundationsconversation-loopoverview