feat: Added skills support

README.md

@@ -36,7 +36,7 @@ coyote --install-from https://github.com/<you>/coyote-config-template --filter a
 coyote --install-from https://github.com/<you>/coyote-config-template --filter mcp_config
 ```
 
-Valid filter values: `agents`, `roles`, `macros`, `functions`, `mcp_config`.
+Valid filter values: `agents`, `roles`, `skills`, `macros`, `functions`, `mcp_config`.
 
 Skip per-file conflict prompts with `--install-force`:
 
@@ -60,6 +60,9 @@ coyote-config-template/
 │       └── scripts/               # Optional graph-node scripts
 ├── roles/
 │   └── <role-name>.md             # Role with frontmatter + prompt body
+├── skills/
+│   └── <skill-name>/
+│       └── SKILL.md               # Skill with frontmatter + body
 ├── macros/
 │   └── <macro-name>.yaml          # Positional/rest-args + REPL command steps
 └── functions/
@@ -78,6 +81,7 @@ prompted to keep yours, take the remote's, or rename the remote entry.
 |--------|-----------------------------------|---------------------------------------------------------|
 | Agent  | `agents/hello-agent/config.yaml`  | Tiny LLM-loop agent that greets the user.               |
 | Role   | `roles/explainer.md`              | Role that explains technical concepts simply.           |
+| Skill  | `skills/rust-fmt/SKILL.md`        | Skill demonstrating `enabled_tools` + `auto_unload`.    |
 | Macro  | `macros/greet.yaml`               | Macro showing positional and rest-arg variables.        |
 | Tool   | `functions/tools/greet.sh`        | Bash tool using Coyote's argc-style annotations.          |
 | MCP    | `functions/mcp.json`              | One vanilla server + one with a vault secret reference. |
@@ -98,6 +102,14 @@ declarative graph agents, put a `graph.yaml` instead
 Each `roles/<name>.md` is a YAML frontmatter block followed by the role
 instructions ([Roles wiki](https://github.com/Dark-Alex-17/coyote/wiki/Roles)).
 
+### Skills
+Each skill lives in its own subdirectory under `skills/`, with a
+`SKILL.md` file containing YAML frontmatter (`description`,
+`enabled_tools`, `enabled_mcp_servers`, `auto_unload`) followed by a
+body of instructions that get injected into the model's system prompt
+while the skill is loaded
+([Skills wiki](https://github.com/Dark-Alex-17/coyote/wiki/Skills)).
+
 ### Macros
 Each `macros/<name>.yaml` is a list of REPL commands to execute, with
 optional positional/rest variables

skills/rust-fmt/SKILL.md

@@ -0,0 +1,22 @@
+---
+description: Run rustfmt and cargo check before finalizing Rust edits. Grants shell access and auto-unloads after the model finishes.
+enabled_tools: execute_command
+auto_unload: true
+---
+You are finalizing edits to a Rust codebase. Before declaring the work complete, ALWAYS run the formatter and a check
+build using the `execute_command` tool.
+
+## Workflow
+
+1. After making edits, run `cargo fmt` to normalize formatting.
+2. Run `cargo check` to surface compilation errors quickly (faster than `cargo build`).
+3. If `cargo check` fails, read the errors and fix before reporting completion.
+4. Only after both succeed, summarize the change.
+
+## Why this skill auto-unloads
+
+`auto_unload: true` in the frontmatter means this skill removes itself from the registry after the model produces a
+final response (no more tool calls). The user's next message starts with a clean context — the next prompt won't have
+"run rustfmt" guidance polluting unrelated discussions.
+
+Reload it explicitly via `.skill load rust-fmt` (or the model can `skill__load` it) when working on Rust again.