opencode

package
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 Go to latest Published: Feb 24, 2026 License: MIT Imports: 17 Imported by: 0

Documentation

Overview

Package opencode implements the Agent interface for OpenCode.

Index

Constants

View Source 
const (
	HookNameSessionStart = "session-start"
	HookNameSessionEnd   = "session-end"
	HookNameTurnStart    = "turn-start"
	HookNameTurnEnd      = "turn-end"
	HookNameCompaction   = "compaction"
)

Hook name constants — these become CLI subcommands under `entire hooks opencode`.

Variables

View Source 
var FileModificationTools = []string{
	"edit",
	"write",
	"patch",
}

FileModificationTools are tools in OpenCode that modify files on disk. These match the actual tool names from OpenCode's source:

  • edit: internal/llm/tools/edit.go (EditToolName)
  • write: internal/llm/tools/write.go (WriteToolName)
  • patch: internal/llm/tools/patch.go (PatchToolName)

Functions

func CalculateTokenUsageFromBytes 

func CalculateTokenUsageFromBytes(data []byte, startMessageIndex int) *agent.TokenUsage

CalculateTokenUsageFromBytes computes token usage from raw export JSON transcript bytes starting at the given message offset. This is a package-level function used by the condensation path (which has bytes, not a file path).

func ExtractAllUserPrompts 

func ExtractAllUserPrompts(data []byte) ([]string, error)

ExtractAllUserPrompts extracts all user prompts from raw export JSON transcript bytes. This is a package-level function used by the condensation path.

func ExtractModifiedFiles 

func ExtractModifiedFiles(data []byte) ([]string, error)

ExtractModifiedFiles extracts modified file paths from raw export JSON transcript bytes. This is the bytes-based equivalent of ExtractModifiedFilesFromOffset, used by ReadSession.

func ExtractTextFromParts 

func ExtractTextFromParts(parts []Part) string

ExtractTextFromParts extracts text content from message parts.

func NewOpenCodeAgent 

func NewOpenCodeAgent() agent.Agent

NewOpenCodeAgent creates a new OpenCode agent instance.

func SanitizePathForOpenCode 

func SanitizePathForOpenCode(path string) string

SanitizePathForOpenCode converts a path to a safe directory name. Replaces any non-alphanumeric character with a dash (same approach as Claude/Gemini).

func SliceFromMessage 

func SliceFromMessage(data []byte, startMessageIndex int) ([]byte, error)

SliceFromMessage returns an OpenCode export transcript scoped to messages starting from startMessageIndex. This is the OpenCode equivalent of transcript.SliceFromLine — for OpenCode's JSON format, scoping is done by message index rather than line offset. Returns the original data if startMessageIndex <= 0. Returns nil, nil if startMessageIndex exceeds the number of messages.

Types

type Cache 

type Cache struct {
	Read  int `json:"read"`
	Write int `json:"write"`
}

Cache holds cache-related token counts.

type ExportMessage 

type ExportMessage struct {
	Info  MessageInfo `json:"info"`
	Parts []Part      `json:"parts"`
}

ExportMessage represents a single message in the export format. Each message contains info (metadata) and parts (content).

type ExportSession 

type ExportSession struct {
	Info     SessionInfo     `json:"info"`
	Messages []ExportMessage `json:"messages"`
}

ExportSession represents the top-level structure of `opencode export` output. This is OpenCode's native format for session data.

func ParseExportSession 

func ParseExportSession(data []byte) (*ExportSession, error)

ParseExportSession parses export JSON content into an ExportSession structure.

type MessageInfo 

type MessageInfo struct {
	ID        string  `json:"id"`
	SessionID string  `json:"sessionID,omitempty"`
	Role      string  `json:"role"` // "user" or "assistant"
	Time      Time    `json:"time"`
	Tokens    *Tokens `json:"tokens,omitempty"`
	Cost      float64 `json:"cost,omitempty"`
}

MessageInfo contains message metadata.

type OpenCodeAgent 

type OpenCodeAgent struct{}

func (*OpenCodeAgent) AreHooksInstalled 

func (a *OpenCodeAgent) AreHooksInstalled() bool

AreHooksInstalled checks if the Entire plugin file exists and contains the marker.

func (*OpenCodeAgent) CalculateTokenUsage 

func (a *OpenCodeAgent) CalculateTokenUsage(sessionRef string, fromOffset int) (*agent.TokenUsage, error)

CalculateTokenUsage computes token usage from assistant messages starting at the given offset.

func (*OpenCodeAgent) ChunkTranscript 

func (a *OpenCodeAgent) ChunkTranscript(content []byte, maxSize int) ([][]byte, error)

ChunkTranscript splits an OpenCode export JSON transcript by distributing messages across chunks. OpenCode uses JSON format with {"info": {...}, "messages": [...]} structure.

func (*OpenCodeAgent) Description 

func (a *OpenCodeAgent) Description() string

func (*OpenCodeAgent) DetectPresence 

func (a *OpenCodeAgent) DetectPresence() (bool, error)

func (*OpenCodeAgent) ExtractModifiedFilesFromOffset 

func (a *OpenCodeAgent) ExtractModifiedFilesFromOffset(path string, startOffset int) ([]string, int, error)

ExtractModifiedFilesFromOffset extracts files modified by tool calls from the given message offset.

func (*OpenCodeAgent) ExtractPrompts 

func (a *OpenCodeAgent) ExtractPrompts(sessionRef string, fromOffset int) ([]string, error)

ExtractPrompts extracts user prompt strings from the transcript starting at the given offset.

func (*OpenCodeAgent) ExtractSummary 

func (a *OpenCodeAgent) ExtractSummary(sessionRef string) (string, error)

ExtractSummary extracts the last assistant message content as a summary.

func (*OpenCodeAgent) FormatResumeCommand 

func (a *OpenCodeAgent) FormatResumeCommand(sessionID string) string

func (*OpenCodeAgent) GetSessionDir 

func (a *OpenCodeAgent) GetSessionDir(repoPath string) (string, error)

GetSessionDir returns the directory where Entire stores OpenCode session transcripts. Transcripts are ephemeral handoff files between the TS plugin and the Go hook handler. Once checkpointed, the data lives on git refs and the file is disposable. Stored in os.TempDir()/entire-opencode/<sanitized-path>/ to avoid squatting on OpenCode's own directories (~/.opencode/ is project-level, not home-level).

func (*OpenCodeAgent) GetSessionID 

func (a *OpenCodeAgent) GetSessionID(input *agent.HookInput) string

func (*OpenCodeAgent) GetSupportedHooks 

func (a *OpenCodeAgent) GetSupportedHooks() []agent.HookType

GetSupportedHooks returns the normalized lifecycle events this agent supports. OpenCode's native hooks map to standard agent lifecycle events:

  • session-start → HookSessionStart
  • session-end → HookSessionEnd
  • turn-start → HookUserPromptSubmit (user prompt triggers a turn)
  • turn-end → HookStop (agent response complete)

Note: HookNames() returns 5 hooks (including "compaction"), but GetSupportedHooks() returns only 4. The "compaction" hook is OpenCode-specific with no standard HookType mapping — it is handled via ParseHookEvent but not advertised as a standard lifecycle event.

func (*OpenCodeAgent) GetTranscriptPosition 

func (a *OpenCodeAgent) GetTranscriptPosition(path string) (int, error)

GetTranscriptPosition returns the number of messages in the transcript.

func (*OpenCodeAgent) HookNames 

func (a *OpenCodeAgent) HookNames() []string

HookNames returns the hook verbs this agent supports.

func (*OpenCodeAgent) InstallHooks 

func (a *OpenCodeAgent) InstallHooks(localDev bool, force bool) (int, error)

InstallHooks writes the Entire plugin file to .opencode/plugins/entire.ts. Returns 1 if the plugin was installed, 0 if already present (idempotent).

func (*OpenCodeAgent) IsPreview 

func (a *OpenCodeAgent) IsPreview() bool

func (*OpenCodeAgent) Name 

func (a *OpenCodeAgent) Name() agent.AgentName

func (*OpenCodeAgent) ParseHookEvent 

func (a *OpenCodeAgent) ParseHookEvent(hookName string, stdin io.Reader) (*agent.Event, error)

ParseHookEvent translates OpenCode hook calls into normalized lifecycle events.

func (*OpenCodeAgent) PrepareTranscript 

func (a *OpenCodeAgent) PrepareTranscript(sessionRef string) error

PrepareTranscript ensures the OpenCode transcript file is up-to-date by calling `opencode export`. OpenCode's transcript is created/updated via `opencode export`, but condensation may need fresh data mid-turn (e.g., during mid-turn commits or resumed sessions where the cached file is stale). This method always refreshes the transcript to ensure the latest agent activity is captured.

func (*OpenCodeAgent) ProtectedDirs 

func (a *OpenCodeAgent) ProtectedDirs() []string

func (*OpenCodeAgent) ReadSession 

func (a *OpenCodeAgent) ReadSession(input *agent.HookInput) (*agent.AgentSession, error)

func (*OpenCodeAgent) ReadTranscript 

func (a *OpenCodeAgent) ReadTranscript(sessionRef string) ([]byte, error)

ReadTranscript reads the transcript for a session. The sessionRef is expected to be a path to the export JSON file.

func (*OpenCodeAgent) ReassembleTranscript 

func (a *OpenCodeAgent) ReassembleTranscript(chunks [][]byte) ([]byte, error)

ReassembleTranscript merges OpenCode export JSON chunks by combining their message arrays.

func (*OpenCodeAgent) ResolveSessionFile 

func (a *OpenCodeAgent) ResolveSessionFile(sessionDir, agentSessionID string) string

func (*OpenCodeAgent) Type 

func (a *OpenCodeAgent) Type() agent.AgentType

func (*OpenCodeAgent) UninstallHooks 

func (a *OpenCodeAgent) UninstallHooks() error

UninstallHooks removes the Entire plugin file.

func (*OpenCodeAgent) WriteSession 

func (a *OpenCodeAgent) WriteSession(session *agent.AgentSession) error

type Part 

type Part struct {
	Type   string     `json:"type"` // "text", "tool", etc.
	Text   string     `json:"text,omitempty"`
	Tool   string     `json:"tool,omitempty"`
	CallID string     `json:"callID,omitempty"`
	State  *ToolState `json:"state,omitempty"`
}

Part represents a message part (text, tool, etc.).

type SessionInfo 

type SessionInfo struct {
	ID        string `json:"id"`
	Title     string `json:"title,omitempty"`
	CreatedAt int64  `json:"createdAt,omitempty"`
	UpdatedAt int64  `json:"updatedAt,omitempty"`
}

SessionInfo contains session metadata from the export.

type Time 

type Time struct {
	Created   int64 `json:"created"`
	Completed int64 `json:"completed,omitempty"`
}

Time holds message timestamps.

type Tokens 

type Tokens struct {
	Input     int   `json:"input"`
	Output    int   `json:"output"`
	Reasoning int   `json:"reasoning"`
	Cache     Cache `json:"cache"`
}

Tokens holds token usage from assistant messages.

type ToolState 

type ToolState struct {
	Status string         `json:"status"` // "pending", "running", "completed", "error"
	Input  map[string]any `json:"input,omitempty"`
	Output string         `json:"output,omitempty"`
}

ToolState represents tool execution state.

Source Files

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