fs

package
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Published: Aug 30, 2026 License: Apache-2.0 Imports: 26 Imported by: 0

Documentation

Overview

Package fs exposes LLM-callable filesystem tools (read, write, edit, glob, grep) on top of minimal per-operation ports. Local, sandbox, and remote backends implement only the capabilities they provide; the tools themselves are thin adapters that marshal LLM JSON into port calls and back.

**Text files only.** Backend implementations MUST reject files that look binary (NUL byte in the first 8 KiB is a good default heuristic) and reject Write content that contains NUL bytes. Use the bash tool if you need to manipulate binary data.

**Tools stay thin.** All content processing — line windowing, binary detection, exact / fuzzy match, append-vs-overwrite — lives in the backend, not the tool. The tool's job is JSON in, JSON out.

Why Glob and Grep have dedicated ports (instead of "walk + match" in the tool layer): a remote backend cannot afford to ship every file across the wire to pattern-match on the agent side. Pushing bulk queries into their ports keeps remote implementations one round-trip per call.

Index

Examples

Constants

This section is empty.

Variables

View Source
var (
	ErrEmptyPath    = errors.New("fs: path must not be empty")
	ErrInvalidInput = errors.New("fs: operation input is invalid")

	ErrPathOutsideRoot = errors.New("fs: path is outside the executor root")

	ErrEmptyPattern = errors.New("fs: pattern must not be empty")

	ErrRipgrepUnavailable = errors.New("fs: ripgrep is unavailable")

	ErrBinaryFile = errors.New("fs: file appears to be binary; only text files are supported")

	ErrFileTooLarge = errors.New("fs: file exceeds the operation input limit")

	ErrLineTooLarge = errors.New("fs: line exceeds the operation line limit")
)

Functions

func ReadLineNumber

func ReadLineNumber(err error) int

ReadLineNumber returns the one-based line attached to an ErrLineTooLarge failure, or zero when the error is not line-specific.

Types

type ApplyPatchRequest

type ApplyPatchRequest struct {
	Patch string `` /* 187-byte string literal not displayed */
}

ApplyPatchRequest applies a Git-compatible unified diff. The local executor supports create, modify, delete, and Git rename patches, which makes a coordinated refactor one call.

type ApplyPatchResponse

type ApplyPatchResponse struct {
	Files []PatchFileResponse `json:"files"`
	Hunks int                 `json:"hunks"`
}

type ApplyPatchTool

type ApplyPatchTool struct {
	// contains filtered or unexported fields
}

func NewApplyPatchTool

func NewApplyPatchTool(executor PatchApplier) *ApplyPatchTool

func (*ApplyPatchTool) Call

func (*ApplyPatchTool) Definition

func (a *ApplyPatchTool) Definition() chat.ToolDefinition

type EditRequest

type EditRequest struct {
	Path       string `json:"path" jsonschema:"minLength=1" jsonschema_description:"File path, absolute or relative to the workspace root."`
	OldString  string `` /* 292-byte string literal not displayed */
	NewString  string `` /* 157-byte string literal not displayed */
	ReplaceAll bool   `` /* 142-byte string literal not displayed */
}

EditRequest drives Read → exact-string replace → Write atomically in the executor. Match policy (exact today, fuzzy in future) remains an executor concern.

type EditResponse

type EditResponse struct {
	Replacements int `json:"replacements"`
}

type EditTool

type EditTool struct {
	// contains filtered or unexported fields
}

EditTool is the thin LLM-facing adapter for Editor.Edit. The match-and-replace logic lives in the executor so a backend upgrade can swap match policy without changing the tool.

func NewEditTool

func NewEditTool(executor Editor) *EditTool

func (*EditTool) Call

func (e *EditTool) Call(ctx context.Context, invocation toolcontract.Invocation) (chat.ToolOutput, error)

func (*EditTool) ConcurrencyKey

func (e *EditTool) ConcurrencyKey(invocation toolcontract.Invocation) (key string, concurrent bool)

ConcurrencyKey opts edit into concurrent execution keyed on its target file — the tool loop's optional concurrency contract (a tool reports per call whether it may overlap others and the resource it conflicts on). The loop parallelizes edits to DISTINCT files and serializes edits to the SAME file. An unparseable / empty path yields no key (no known conflict); the call still fails its own validation in Call.

func (*EditTool) Definition

func (e *EditTool) Definition() chat.ToolDefinition

type Editor

type Editor interface {
	Edit(ctx context.Context, request EditRequest) (EditResponse, error)
}

type GlobInput

type GlobInput struct {
	Pattern    string
	Path       string // "" = executor's authority root
	IgnoreCase bool
	MaxResults int // 0 = executor default
}

GlobInput uses doublestar syntax. Path narrows the executor's immutable authority to a relative subtree; it can never replace or broaden that root.

type GlobRequest

type GlobRequest struct {
	Pattern    string `json:"pattern" jsonschema:"minLength=1" jsonschema_description:"Doublestar path pattern, such as **/*.go or src/**/*.ts."`
	Path       string `json:"path,omitempty" jsonschema_description:"Directory to search under. Defaults to the workspace root."`
	IgnoreCase bool   `json:"ignore_case,omitempty" jsonschema_description:"Match path components case-insensitively. Default false."`
	MaxResults int    `` /* 154-byte string literal not displayed */
}

type GlobResponse

type GlobResponse struct {
	Paths     []string `json:"paths"`
	Truncated bool     `json:"truncated,omitempty"`
}

type GlobTool

type GlobTool struct {
	// contains filtered or unexported fields
}

func NewGlobTool

func NewGlobTool(executor Globber) *GlobTool

func (*GlobTool) Call

func (g *GlobTool) Call(ctx context.Context, invocation toolcontract.Invocation) (chat.ToolOutput, error)

func (*GlobTool) ConcurrencyKey

func (g *GlobTool) ConcurrencyKey(toolcontract.Invocation) (key string, concurrent bool)

ConcurrencyKey opts glob into parallel execution — a read-only filename search has no conflict (the tool loop's optional concurrency contract).

func (*GlobTool) Definition

func (g *GlobTool) Definition() chat.ToolDefinition

type Globber

type Globber interface {
	Glob(ctx context.Context, in GlobInput) (GlobResponse, error)
}

type GrepFileCount

type GrepFileCount struct {
	Path  string `json:"path"`
	Count int    `json:"count"`
}

GrepFileCount is one entry of the "count" output mode.

type GrepInput

type GrepInput struct {
	Pattern    string // regex
	Path       string // file or directory below the executor's authority root
	Glob       string // optional file filter ("*.go", "**/*.ts", ...)
	FileType   string // rg-style ("go", "ts", "rust", ...). Backend decides mapping.
	IgnoreCase bool
	Multiline  bool

	// Context is the symmetric "lines before AND after" shortcut.
	// BeforeContext / AfterContext override per-side when non-zero.
	Context       int
	BeforeContext int
	AfterContext  int

	// OutputMode picks the shape of GrepResponse. Its zero value resolves to
	// [GrepOutputContent].
	OutputMode GrepOutputMode

	MaxResults int
}

type GrepLine

type GrepLine struct {
	Path string       `json:"path"`
	Line int          `json:"line"` // 1-based
	Text string       `json:"text"`
	Kind GrepLineKind `json:"kind"`
}

GrepLine is one structured ripgrep line event.

type GrepLineKind

type GrepLineKind string

GrepLineKind distinguishes a matching line from requested surrounding context.

const (
	// GrepLineMatch identifies content matched by the regular expression.
	GrepLineMatch GrepLineKind = "match"

	// GrepLineContext identifies surrounding content requested for a match.
	GrepLineContext GrepLineKind = "context"
)

func (GrepLineKind) String

func (g GrepLineKind) String() string

func (GrepLineKind) Valid

func (g GrepLineKind) Valid() bool

type GrepOutputMode

type GrepOutputMode string

GrepOutputMode controls what GrepResponse populates.

const (
	GrepOutputContent          GrepOutputMode = "content"
	GrepOutputFilesWithMatches GrepOutputMode = "files_with_matches"
	GrepOutputCount            GrepOutputMode = "count"
)

func (GrepOutputMode) Resolve

func (g GrepOutputMode) Resolve() GrepOutputMode

func (GrepOutputMode) Valid

func (g GrepOutputMode) Valid() bool

type GrepRequest

type GrepRequest struct {
	Pattern  string `json:"pattern" jsonschema:"minLength=1" jsonschema_description:"Regular expression in ripgrep syntax."`
	Path     string `json:"path,omitempty" jsonschema_description:"File or directory to search. Defaults to the workspace root."`
	FileGlob string `json:"file_glob,omitempty" jsonschema_description:"Optional file filter glob, such as **/*.go."`
	FileType string `json:"file_type,omitempty" jsonschema_description:"Optional ripgrep file type, such as go, ts, or rust."`

	IgnoreCase bool `json:"ignore_case,omitempty" jsonschema_description:"Case-insensitive search. Default false."`
	Multiline  bool `json:"multiline,omitempty" jsonschema_description:"Allow patterns to span line breaks. Default false. Requires ripgrep."`

	BeforeContextLines int `` /* 168-byte string literal not displayed */
	AfterContextLines  int `` /* 166-byte string literal not displayed */

	OutputMode GrepOutputMode `` /* 182-byte string literal not displayed */

	MaxResults int `` /* 153-byte string literal not displayed */
}

GrepRequest is the LLM-facing argument shape for the grep tool.

Notes on pattern syntax: the underlying engine is ripgrep. Literal braces / brackets need escaping (`interface\{\}` to find `interface{}`). By default patterns match within a single line; set `multiline=true` for patterns that span newlines.

type GrepResponse

type GrepResponse struct {
	Lines     []GrepLine      `json:"lines,omitempty"`
	Files     []string        `json:"files,omitempty"`
	Counts    []GrepFileCount `json:"counts,omitempty"`
	Truncated bool            `json:"truncated,omitempty"`
}

GrepResponse is the LLM-facing return shape. Exactly one of lines / files / counts is populated based on the request's output_mode.

type GrepTool

type GrepTool struct {
	// contains filtered or unexported fields
}

func NewGrepTool

func NewGrepTool(executor Grepper) *GrepTool

func (*GrepTool) Call

func (g *GrepTool) Call(ctx context.Context, invocation toolcontract.Invocation) (chat.ToolOutput, error)

func (*GrepTool) ConcurrencyKey

func (g *GrepTool) ConcurrencyKey(toolcontract.Invocation) (key string, concurrent bool)

ConcurrencyKey opts grep into parallel execution — a read-only content search has no conflict (the tool loop's optional concurrency contract).

func (*GrepTool) Definition

func (g *GrepTool) Definition() chat.ToolDefinition

type Grepper

type Grepper interface {
	Grep(ctx context.Context, in GrepInput) (GrepResponse, error)
}

type LocalExecutor

type LocalExecutor struct {
	// contains filtered or unexported fields
}

LocalExecutor is the reference local filesystem backend. Its constructor grants one immutable directory-tree authority; operation inputs may narrow that authority but cannot replace or escape it.

  • Glob uses the platform-neutral doublestar matcher and never follows directory symlinks while walking.
  • Grep consumes ripgrep's structured JSON protocol and returns ErrRipgrepUnavailable when rg is not installed.
  • Write and Edit serialize per file via [LocalExecutor.lockPath] so concurrent tool calls on the same path can't tear.
  • Read normalises CRLF→LF and strips UTF-8 BOM; Write and Edit restore both when the existing file uses them.

func NewLocalExecutor

func NewLocalExecutor(root string) *LocalExecutor

func (*LocalExecutor) ApplyPatch

func (l *LocalExecutor) ApplyPatch(ctx context.Context, in ApplyPatchRequest) (_ ApplyPatchResponse, err error)

func (*LocalExecutor) Edit

func (l *LocalExecutor) Edit(ctx context.Context, in EditRequest) (_ EditResponse, err error)

func (*LocalExecutor) Glob

func (l *LocalExecutor) Glob(ctx context.Context, in GlobInput) (_ GlobResponse, err error)

func (*LocalExecutor) Grep

func (l *LocalExecutor) Grep(ctx context.Context, in GrepInput) (_ GrepResponse, err error)

func (*LocalExecutor) Read

func (l *LocalExecutor) Read(ctx context.Context, in ReadInput) (_ ReadOutput, err error)

Read does not lock — concurrent reads are fine and a slightly stale read while another goroutine writes is acceptable (atomic-rename in Write means the caller sees either the old file in full or the new file in full, never a torn write).

func (*LocalExecutor) Write

func (l *LocalExecutor) Write(ctx context.Context, in WriteInput) (_ WriteResponse, err error)

type PatchApplier

type PatchApplier interface {
	ApplyPatch(ctx context.Context, request ApplyPatchRequest) (ApplyPatchResponse, error)
}

type PatchFileResponse

type PatchFileResponse struct {
	// Path is where the file ended up.
	Path    string `json:"path"`
	Hunks   int    `json:"hunks"`
	Created bool   `json:"created,omitempty"`
	Deleted bool   `json:"deleted,omitempty"`
	// MovedFrom is the path the file left, set only for a move. Path alone would
	// say a file exists somewhere new without saying which one stopped existing.
	MovedFrom string `json:"moved_from,omitempty"`
}

type ReadInput

type ReadInput struct {
	Path           string
	Offset         int   // 0-based line offset; negative is clamped to 0
	Limit          int   // 0 = read to end of file
	MaxInputBytes  int64 // 0 = executor default
	MaxLineBytes   int   // 0 = executor default
	MaxOutputBytes int   // 0 = executor default
	PartialLine    bool  // admit a UTF-8 prefix when the output cap splits a line
}

ReadInput is line-based. The executor handles binary detection and line windowing — the tool only forwards what the LLM asked for.

type ReadOutput

type ReadOutput struct {
	Content    string
	StartLine  int
	EndLine    int
	TotalLines int
	Truncated  bool
}

type ReadRequest

type ReadRequest struct {
	Path      string `json:"path" jsonschema:"minLength=1" jsonschema_description:"File path, absolute or relative to the workspace root."`
	StartLine int    `` /* 132-byte string literal not displayed */
	MaxLines  int    `` /* 141-byte string literal not displayed */
}

ReadRequest is the LLM-facing argument shape for the read tool. StartLine is 1-based to match editor, grep, and language-server conventions.

type ReadResponse

type ReadResponse struct {
	Content    string `json:"content"`
	StartLine  int    `json:"start_line"`
	EndLine    int    `json:"end_line"`
	TotalLines int    `json:"total_lines"`
	Truncated  bool   `json:"truncated,omitempty"`
}

ReadResponse is the LLM-facing return shape. StartLine / EndLine are 1-based inclusive.

type ReadTool

type ReadTool struct {
	// contains filtered or unexported fields
}

func NewReadTool

func NewReadTool(executor Reader) *ReadTool
Example
package main

import (
	"fmt"

	toolfs "github.com/Tangerg/scope/tools/fs"
)

func main() {
	read := toolfs.NewReadTool(nil)
	definition := read.Definition()

	fmt.Println(definition.Name)
}
Output:
read

func (*ReadTool) Call

func (r *ReadTool) Call(ctx context.Context, invocation toolcontract.Invocation) (chat.ToolOutput, error)

func (*ReadTool) ConcurrencyKey

func (r *ReadTool) ConcurrencyKey(toolcontract.Invocation) (key string, concurrent bool)

ConcurrencyKey opts read into parallel execution — a pure read has no resource conflict (the tool loop's optional concurrency contract), so the loop runs several reads (and reads alongside other parallel tools) at once.

func (*ReadTool) Definition

func (r *ReadTool) Definition() chat.ToolDefinition

type Reader

type Reader interface {
	Read(ctx context.Context, in ReadInput) (ReadOutput, error)
}

Each tool depends on the smallest backend capability it consumes. A backend may implement any combination of these ports; LocalExecutor implements all of them without forcing remote or policy-specific backends to grow unrelated methods.

type WriteInput

type WriteInput struct {
	Path    string
	Content string
}

type WriteRequest

type WriteRequest struct {
	Path    string `` /* 162-byte string literal not displayed */
	Content string `` /* 133-byte string literal not displayed */
}

type WriteResponse

type WriteResponse struct {
	BytesWritten int `json:"bytes_written"`
}

type WriteTool

type WriteTool struct {
	// contains filtered or unexported fields
}

func NewWriteTool

func NewWriteTool(executor Writer) *WriteTool

func (*WriteTool) Call

func (w *WriteTool) Call(ctx context.Context, invocation toolcontract.Invocation) (chat.ToolOutput, error)

func (*WriteTool) ConcurrencyKey

func (w *WriteTool) ConcurrencyKey(invocation toolcontract.Invocation) (key string, concurrent bool)

ConcurrencyKey opts write into concurrent execution keyed on its target file (the tool loop's optional concurrency contract): distinct-file writes run in parallel, same-file writes serialize. An unparseable / empty path yields no key (no known conflict).

func (*WriteTool) Definition

func (w *WriteTool) Definition() chat.ToolDefinition

type Writer

type Writer interface {
	Write(ctx context.Context, in WriteInput) (WriteResponse, error)
}

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