Internal Plugins

A broad set of plugins ship in-tree. They cover the file, search, shell, git, spec-sync, snapshot, code-runtime, media, sub-agent delegation, and bridge surface area the agent needs for coding tasks and automated UI testing. The reference below documents the core set; see Plugin Authoring to write your own.

`fledge-plugin-files`

File system operations.

Command	Args	Description
`files-read`	`path: string`	Read file contents
`files-write`	`path: string`, `content: string`	Write content to a file (overwrites)
`files-edit`	`path: string`, `old: string`, `new: string`, `replace_all: string?`	Replace occurrences of `old` with `new`. First match only by default; pass `replace_all="true"` to replace all
`files-glob`	`pattern: string`	List files matching a glob pattern (e.g. `src/*/.rs`)
`files-delete`	`path: string`	Delete a file. Refuses directories

files-write, files-edit, and files-delete are tracked by the agent: successful calls populate TaskResult.files_changed.

`fledge-plugin-search`

Code search.

Command	Args	Description
`search-grep`	`pattern: string`, `path: string?`, `include: string?`	Recursive grep over all text files. Skips binaries and build dirs. Optional `include` filters by extension (e.g. `"rs,toml"`)
`search-references`	`symbol: string`	Find references to a symbol across the project
`search-symbols`	`path: string`	List code symbols (fn, struct, enum, trait, impl, mod) in a file

`fledge-plugin-shell`

Sandboxed shell execution.

Command	Args	Description
`shell-exec` (dangerous)	`command: string`	Run a shell command via `sh -c`

Flagged dangerous = true in plugin.toml. The CLI may use this flag to gate confirmation in future releases.

`fledge-plugin-specsync`

Spec-sync wrapper.

Command	Args	Description
`specsync-check`	--	Run spec-sync validation
`specsync-list`	--	List registered spec module names
`specsync-read`	`name: string`	Read a spec by module name

These are what the agent's spec-aware planning calls.

`fledge-plugin-git`

Git operations.

Command	Args	Description
`git-status`	--	Show working tree status (short format)
`git-diff`	`target: string?`	Show changes (vs working tree if no target)
`git-commit`	`message: string`	Stage all changes and commit
`git-branch`	`name: string?`	List branches, or create+checkout `name`

`fledge-plugin-snapshots`

Visual snapshot harness for automated UI testing of the desktop app.

Command	Args	Description
`snapshots-list`	--	List capture scenarios and their file sizes
`snapshots-capture`	`rebuild: string?`	Run the capture script for all scenarios. Pass `"true"` to rebuild the desktop binary first
`snapshots-show`	`scenario: string`	Print a single scenario PNG's path and size

External Plugins

Merlin will automatically pick up any other plugins fledge knows about, including:

fledge-plugin-memory -- three-tier memory store (ephemeral, mutable, permanent).
fledge-plugin-algochat -- Algorand-based messaging.
fledge-plugin-sql -- direct SQL execution.
fledge-plugin-localnet -- Algorand localnet management.

These are not part of this repository. Merlin's core/cli treats them as commodity tools -- if their plugin.toml declares typed args, they get typed schemas; if not, they fall back to the legacy args: string form.