- Removed insertBefore and substr hashline edit operations, simplifying the edit API to support only replaceLine, replaceLines, and insertAfter operations.
- Updated hashline edit schema and type definitions to remove insertBefore and substr operation types from the ParsedRefs union and edit validation logic.
- Removed insertBefore and substr test cases from hashline test suite, including tests for insert-before functionality, anchor echo stripping, and substring matching.
- Updated benchmark runner to refactor edit operations from src/dst format to discriminated union types (replaceLine, replaceLines, insertAfter) and adjusted insertAfter line references.
- Redesigned hashline edit API to use discriminated union variants (replaceLine, replaceLines, insertAfter, insertBefore, substr) instead of nested src/dst structure.
- Changed hash algorithm from xxHash64 hex to xxHash32 base36 encoding and increased hash length from 2 to 3 characters.
- Added substr edit variant to match and replace content by unique substring when line hashes are unavailable.
- Implemented line relocation heuristics to resolve stale line references when hash uniquely identifies a moved line.
- Moved substr needle search from edit application phase to pre-validation phase for earlier error detection.
- Migrated hashline edit type definitions from manual TypeScript interfaces to schema-derived types using Static<typeof schema> pattern.
- Added `substr` source specification kind to match and replace lines by unique substring without requiring line-hash references.
- Implemented substring matching logic in hashline edits with validation for uniqueness and error handling for not-found and ambiguous cases.
- Added schema definition and type guards for the new `substr` operation type across patch system.
- Added mutation preview hints to error messages when edits fail with 'No changes made' errors, showing line numbers, hashes, and added/removed lines.
- Changed formatter to pin JavaScript fixtures to the flow parser to avoid parser-dependent formatting drift.
- Added whitespace preservation logic to treat whitespace-only differences as passing in file verification.
- Removed substring source specification kind from hashline edits, requiring users to use line-hash references instead.
- Simplified SrcSpec type to use generic type parameter for line references, removing substring variant from union.
- Updated react-edit-benchmark to use --max-tasks option for deterministic task sampling and changed default batch sizes to 1.
- Added streaming functions `streamHashLinesFromUtf8` and `streamHashLinesFromLines` for processing large files with configurable chunking.
- Added `HashlineStreamOptions` interface to control streaming behavior with `startLine`, `maxChunkLines`, and `maxChunkBytes` options.
- Changed hashline format from 4-character to 2-character hex hashes for more compact output.
- Updated `computeLineHash` function to normalize whitespace and removed line number from hash seed for consistency.
- Improved CLI argument parsing with explicit handling of `--help`, `--version`, and subcommand detection.
- Removed `@types/diff` dev dependency as it is no longer needed.
- Changed `HashlineEdit.src` from string format (e.g., `"5:ab"`, `"5:ab..9:ef"`) to structured `SrcSpec` object with discriminated union types (`{ kind: "single", ref: "..." }`, `{ kind: "range", start: "...", end: "..." }`, `{ kind: "insertAfter", after: "..." }`, `{ kind: "insertBefore", before: "..." }`, `{ kind: "substring", needle: "..." }`).
- Refactored `parseSrc` function to `parseSrcSpec` to handle structured `SrcSpec` objects instead of string parsing, replacing string validation and delimiter parsing logic with explicit case handling for each operation kind.
- Updated tool schema in `index.ts` to define `srcSpecSchema` as a discriminated union type with five variants, replacing the previous simple string-based `src` parameter definition.
- Added substring-based source matching for hashline edits to support matching lines by content when hash references are unavailable.
- Added automatic detection and repair of single-line merges where models incorrectly combine multiple lines into one.
- Added normalization of Unicode-confusable hyphens to ASCII hyphens to handle model-generated variations.
- Added heuristics to restore indentation and preserve wrapped line formatting during edits.
- Relaxed comma validation in src to allow commas while rejecting inputs with multiple line references.
- Enhanced parseLineRef to accept shorter hash prefixes instead of requiring exact hash matches.
- Improved error messages for hash mismatches to provide more actionable guidance.
- Replaced HashlineEdit API from old/new/after fields to src/dst fields with unified range syntax supporting single lines, ranges, insert-after, and insert-before operations.
- Added parseSrc() function to parse structured line references from src strings supporting formats like '5:ab', '5:ab..9:ef', '5:ab..', and '..5:ab'.
- Added heuristics to strip anchor line echoes and range boundary echoes from model-generated replacement content.
- Implemented preserveWhitespaceOnlyLinesLoose() for improved whitespace preservation using loose matching strategy when replacement line counts don't match.
- Added comprehensive benchmark reports for Claude Sonnet 4.5, Gemini 2.5 Flash Lite, and GPT-5.1 Codex Mini models evaluating hashline edit performance across 60 tasks.
- Added `toArray()` helper function to normalize `string | string[]` inputs for hashline edit operations with comma-separated line reference support.
- Added `HashlineMismatchError` class that displays grep-style output with `>>>` markers for hash validation failures.
- Added `HashMismatch` type for representing individual hash mismatches with line number, expected hash, and actual hash.
- Updated `HashlineEdit` type to accept `string | string[]` for `old` and `new` fields, allowing both singular and plural input formats.
- Reduced hash length from 4 to 2 hex characters (16-bit hashes) for more concise line references.
- Enhanced `parseLineRef()` to strip display-format suffixes and `validateLineRef()` to throw `HashlineMismatchError` with context lines for better error reporting.
- Added HashlineMismatchError class with formatted error messages showing mismatched hashes with context lines.
- Added HashMismatch type to represent hash validation errors with line number, expected, and actual hash values.
- Enhanced hash validation in applyHashlineEdits to collect all hash mismatches before applying edits instead of failing on first mismatch.
- Renamed HashlineEdit fields from 'src'/'dst' to 'old'/'new' for improved naming clarity and consistency.
- Added hashline edit mode for line-addressed edits using hash-verified line references with xxHash64 integrity verification.
- Replaced `edit.patchMode` boolean setting with `edit.mode` enum supporting 'replace', 'patch', and 'hashline' modes.
- Added `readHashLines` configuration setting to include line hashes in read output for hashline edit mode.
- Implemented `computeLineHash`, `formatHashLines`, `parseLineRef`, `validateLineRef`, and `applyHashlineEdits` utility functions for hashline operations.
- Updated read tool to support optional `hashes` parameter and prioritize hash lines over line numbers when both are requested.
- Changed `getEditModelVariants()` return type from `Record<string, 'patch' | 'replace'>` to `Record<string, EditMode | null>` and removed hardcoded model-specific defaults.
- Fixed bash tool hanging with background jobs by implementing timeout-based cancellation and draining stdout/stderr pipes instead of waiting indefinitely for EOF.
- Fixed crash when auto-reading large @mentions by adding file size validation (5MB for text, 25MB for images) before reading file contents.
- Prevented out-of-memory issues by skipping files exceeding size limits and displaying file size information in UI for skipped files.
- Added GB file size formatting support to handle very large files in human-readable format.
- Added file size display in UI for skipped files to inform users why files were not included.
- Added test case verifying bash executor returns correctly when command spawns background jobs.
- Fixed patch applicator to preserve indentation in context-only hunks by skipping unnecessary adjustments when pattern equals actual content.
- Implemented linear regression-based tab width inference to correctly convert space-indented diffs to tab-indented files using ax+b model.
- Added regression tests for context-only hunk handling and space-to-tab indentation conversion with offset models.
- Updated patch tool documentation to emphasize never using edit operations for indentation or formatting fixes.
- Fixed `newSession()` to properly await session manager operations for full initialization.
- Changed session formatting to use XML structure instead of YAML for tools and tool invocations.
- Added formatArgsAsXml() helper function to serialize objects as XML parameter elements.
- Removed trailing whitespace from task.md prompt file.
- Added regression test for AgentSession.newSession() to verify proper session switching and artifact isolation.
- Removed getCursorPosition() method from Component interface and implementations, eliminating hardware cursor positioning support.
- Changed PI_HARDWARE_CURSOR environment variable default from implicit true to explicit '1' with fallback pattern.
- Changed PI_CLEAR_ON_SHRINK environment variable default from implicit false to explicit '0' with fallback pattern.
- Added screen clearing on TUI startup to prevent shell prompts from bleeding into first rendered frame.
- Refactored full-render logic into reusable fullRender() helper function.
- Migrated authentication storage from JSON-based (auth.json) to database-based (agent.db) format across test files and configuration.
- Simplified auth storage discovery in sdk.ts by removing manual path construction and fallback logic in favor of centralized getAgentDbPath() function.
- Removed dbPath instance property from AuthStorage class as database path is now managed centrally.
- Updated environment variable precedence documentation to reflect agent.db instead of auth.json as the lowest priority source.
- Removed OAuth provider section header comments from multiple test files for cleaner test organization.
- Added support for JSON and JSONC configuration file formats without requiring migration to YAML.
- Added Windows-specific process handle duplication mechanism to safely manage process termination across multiple handles.
- Implemented Windows signal handling support with Signal enum variants (Terminate, Kill, Interrupt) and kill_process() function using Windows API.
- Added background job termination on cancellation with platform-specific implementations (TERM/KILL signals on Unix, TerminateProcess on Windows).
- Implemented cancellation token support in shell execution with proper cleanup of background jobs when timeout or abort occurs.
- Added test coverage for background job termination on timeout and abort scenarios.
- Refactored task API to use 'assignment' field instead of 'args' for per-task instructions, enabling clearer separation between shared context and task-specific work.
- Introduced structured context/assignment separation pattern with '<swarm_context>' wrapper for template rendering, replacing placeholder-based substitution.
- Changed agent frontmatter field from 'thinkingLevel' to 'thinking-level' (kebab-case) for consistency with YAML conventions.
- Removed 'context' parameter from ExecutorOptions as context is now prepended at template level rather than executor level.
- Removed 'args' field from AgentProgress and SingleResult interfaces, simplifying task result tracking.
- Updated task rendering to display full task text instead of formatted args, improving clarity in progress output.
- Migrated all environment variable access from Node.js `process.env` to Bun runtime `Bun.env` API across the entire codebase.
- Updated 71 files including source code, tests, documentation, and configuration to use Bun's native environment variable API.
- Added comprehensive environment variables documentation in `packages/coding-agent/docs/environment-variables.md` covering 100+ environment variables organized by category.
- Updated CHANGELOG entries to reflect migration from `process.env` to `Bun.env` and environment variable prefix changes (PI_* vs OMP_*).
- Maintained identical behavior and logic across all changes - only the environment variable access method was updated.
- Consolidated API key retrieval across test files to use centralized e2eApiKey() utility function instead of direct environment variable access.
- Removed local API_KEY constant definitions and replaced with imports of e2eApiKey from shared oauth test utilities.
- Updated test skip conditions to use e2eApiKey('ANTHROPIC_API_KEY') for consistent API key availability checks across all test suites.
- Replaced nanoid and randomUUID with Snowflake ID generator across codebase for consistent distributed ID generation.
- Created new Snowflake utility module in packages/utils with support for 64-bit distributed ID generation with configurable epoch, machine ID, and sequence numbers.
- Updated session ID format documentation from nanoid to snowflake hex string format (16 hex characters).
- Removed nanoid dependency from package.json as it is now replaced by internal Snowflake implementation.
- Migrated environment variable access from direct process.env to centralized getEnv() utility function across all packages.
- Renamed environment variable prefix from OMP_ to PI_ throughout codebase (e.g., OMP_CODING_AGENT_DIR -> PI_CODING_AGENT_DIR).
- Removed automatic environment variable migration from PI_ to OMP_ prefixes via migrate-env.ts module.
- Removed env setting from configuration schema and applyEnvironmentVariables() method from settings.
- Updated CI/CD build configuration to use PI_COMPILED flag instead of OMP_COMPILED.
- Changed venvPath property in PythonRuntime from nullable (string | null) to optional (string | undefined).
- Added default generic type parameter to Model interface, allowing Model to be used without explicit type argument.
- Removed explicit <any> generic type parameters from Model type annotations throughout codebase, leveraging new default parameter.
- Added PATH environment variable merging on Windows to deduplicate and normalize path entries.
- Enhanced Git path detection to support multiple installation patterns (cmd, bin, usr/bin, mingw variants).
- Implemented path normalization and deduplication logic to prevent duplicate entries in PATH.
- Refactored Windows Git path discovery to return multiple candidate paths instead of single path.
- Removed `output_mode` parameter from grep tool, consolidating all output to content mode with file grouping and match headers.
- Renamed grep context parameters from `context_pre`/`context_post` to `pre`/`post` for improved clarity.
- Removed `n` (line numbers) parameter from grep tool as line numbers are now always displayed.
- Reformatted grep output to display numbered matches with file paths, line numbers, and context lines with consistent alignment.
- Introduced `SearchParams` struct in Rust grep implementation to simplify parameter passing and improve code maintainability.
- Made `normalize_env_key` function const-eligible for compile-time evaluation in shell module.
- Refactored ExecutablePathSearch to remove generic type parameter N and use pre-computed filename candidates instead of single filename.
- Extracted platform-specific candidate_filenames() functions to generate executable filename variants on Windows and Unix-like systems.
- Replaced manual PATH string splitting with std::env::split_paths() for cross-platform path parsing.
- Simplified find_in_path() method to delegate to pathsearch::search_for_executable() instead of custom path searching logic.
- Implemented executable_extensions() function with lazy initialization to parse PATHEXT environment variable on Windows.
- Enhanced executable() method to validate file extensions against known executable extensions instead of returning hardcoded true.
- Consolidated directory listing functionality from dedicated `ls` tool into the `read` tool.
- Removed the `ls` tool and all related exports, types, and configurations from the public API.
- Updated `read` tool to return formatted directory listings with modification times instead of redirecting to `ls` tool.
- Removed `bashInterceptor.simpleLs` setting and related interception logic from bash tool.
- Removed `ls.enabled` setting and related tool registration logic.
- Removed test cases for the `ls` tool and updated tool type definitions to remove `LsToolResultEvent`.
- Removed 'strippedRedirect' field from NormalizedCommand interface returned by normalizeBashCommand().
- Removed automatic stripping of '2>&1' stderr redirections from bash command normalization.
- Updated bash-normalize function to only extract head/tail patterns and no longer process stderr redirection.
- Removed test cases for 2>&1 stripping and combined pattern handling in bash-normalize tests.
- Vendored brush-core crate locally to enable local development and patching.
- Added patch.crates-io section in Cargo.toml to redirect brush-core dependency to vendored version at crates/brush-core-vendored.
- Updated pi-natives Cargo.toml to use local path dependency for brush-core instead of external crate version.
- Fixed `find` tool to return a single match when given a file path instead of failing with 'not a directory' error.
- Added `hasGlobChars` helper function to detect glob patterns and distinguish file paths from glob patterns.
- Extended `FindOperations` interface with optional `stat` method for distinguishing files from directories.
- Added test case verifying that `find` tool correctly returns a single file when given a file path.
- Added session-based shell execution with persistent shell instances and session management via sessionKey parameter.
- Added support for shell snapshots to initialize bash sessions with saved state via snapshotPath parameter.
- Added sessionEnv option to set environment variables once per session, separate from command-specific env variables.
- Added process group management functions (process_group_id and kill_process_group) for better process lifecycle control on Linux, macOS, and Windows.
- Changed env option to apply variables for the current command only, with session-level variables now managed via sessionEnv.
- Refactored shell execution to use async output queuing with enqueueChunk for proper chunk sequencing and improved timeout handling with process group termination.
- Added native shell execution API via brush-core with streaming output support and configurable timeouts.
- Migrated bash executor from persistent ptree-based shell sessions to native bindings with improved performance and simplified architecture.
- Removed persistent shell session module and replaced with native brush-core implementation for better resource management.
- Added executeShell() and abortShellExecution() functions to native bindings for shell command execution with cancellation support.
- Implemented shell execution with support for environment variables, working directory changes, and timeout handling.
- Renamed `EllipsisKind` enum to `Ellipsis` across all packages for clearer API naming.
- Refactored Rust text module from 356 to 155 lines with simplified state tracking using u32 ColorVal instead of enum ColorCode and named attribute constants.
- Removed `Env` parameter from public NAPI functions `truncate_to_width` and `extract_segments` to simplify API surface.
- Changed return type of `truncate_to_width` from `JsString` to `Either<JsString, Utf16String>` to support zero-copy returns.
- Removed early return optimization in `truncateToWidth()` function.
- Reordered native module search paths to prioritize repository build artifacts over system paths.
- Replaced SettingsManager class with new Settings singleton providing synchronous get/set API and background persistence.
- Introduced settings-schema.ts as single source of truth for all configuration definitions with 100+ settings organized into logical groups.
- Migrated from method-based settings access (getTheme(), setTheme()) to path-based access using dot notation (settings.get('theme'), settings.set('theme', value)).
- Removed 2035-line settings-manager.ts file and replaced with modular settings.ts (693 lines) and settings-schema.ts (836 lines) for improved maintainability.
- Unified settings schema into single source of truth eliminating duplicate definitions across settings-defs.ts and settings-manager.ts.
- Added head and tail parameters to bash tool for native output limiting without piping.
- Implemented automatic normalization of bash commands to extract and strip head/tail pipes and stderr redirects.
- Created bash-normalize utility module with normalizeBashCommand and applyHeadTail functions for command processing.
- Updated bash tool documentation to recommend using head/tail parameters instead of piping through shell commands.
- Added comprehensive test coverage for bash command normalization and head/tail filtering functionality.
- Added persistent shell session support for bash tool with environment variable preservation across commands.
- Added shellForceBasic setting to force bash/sh even if user's default shell is different (default: true).
- Added OMP_SHELL_PERSIST environment variable to control persistent shell behavior (set to 0 to disable).
- Restructured system prompt with coordinator-specific guidance for parallel task delegation.
- Added grep CLI subcommand with support for pattern matching, file globbing, context lines, and multiple output modes (content, files-with-matches, count).
- Added diff syntax highlighting support with distinct colors for inserted and deleted lines in code output.
- Implemented FileReader abstraction for cross-platform file reading with mmap support and 4MB size limit.
- Refactored worker pool initialization to support both compiled and development build environments using resolveWorkerSpecifier utility.
- Enhanced markdown rendering with improved inline style context handling and blockquote formatting with text wrapping.
- Replaced external strip-ansi dependency with Bun's built-in stripANSI method across all packages.
- Simplified find tool API by removing separate `path` parameter and consolidating pattern parsing into a single `pattern` parameter that includes the search path.
- Added automatic recursive search for simple patterns like `*.ts` by implicitly prefixing them with `**/` when no explicit path is provided.
- Implemented `parsePatternPath()` function to intelligently extract base directory and glob pattern from user input, supporting patterns like `src/**/*.tsx`, `lib/*.json`, and `*.md`.
- Fixed incorrect byte and line limit calculations in file read tool that were applying user limits to total selected content instead of just user-limited content.
- Updated test to use SettingsManager.getGlobalShellConfig() instead of shell.getShellConfig() for consistent shell configuration access.
- Reorganized import statements across multiple files for consistency and alphabetical ordering.
- Changed firstLinePreviewChunks from let to const in read tool since it is only mutated via array methods.
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