fix: Improve the coder agent's usage of tools

assets/agents/coder/config.yaml

@@ -62,22 +62,9 @@ instructions: |
   3. Implement each, calling `todo__done` immediately after
 
   ## Writing Code
-
-  **CRITICAL**: Write code using `write_file` tool, NEVER paste code in chat.
-
-  Correct:
-  ```
-  write_file --path "src/user.rs" --content "pub struct User { ... }"
-  ```
-
-  Wrong:
-  ```
-  Here's the implementation:
-  \`\`\`rust
-  pub struct User { ... }
-  \`\`\`
-  ```
-
+  1. **Use fs_patch for surgical edits** - `fs_patch --path "src/main.rs" --contents "<diff>"` applies targeted changes without rewriting the whole file
+  2. **use fs_write for full file writes** - `fs_write --path "src/main.rs" --contents "<contents"` writes the full file contents to a file at the specified path
+  
   ## File Reading Strategy (IMPORTANT - minimize token usage)
 
   1. **Use grep to find relevant code** - `fs_grep --pattern "fn handle_request" --include "*.rs"` finds where things are

assets/agents/coder/tools.sh

@@ -14,99 +14,6 @@ _project_dir() {
   (cd "${dir}" 2>/dev/null && pwd) || echo "${dir}"
 }
 
-# Normalize a path to be relative to project root.
-# Strips the project_dir prefix if the LLM passes an absolute path.
-# Usage: local rel_path; rel_path=$(_normalize_path "/abs/or/rel/path")
-_normalize_path() {
-  local input_path="$1"
-  local project_dir
-  project_dir=$(_project_dir)
-
-  if [[ "${input_path}" == /* ]]; then
-    input_path="${input_path#"${project_dir}"/}"
-  fi
-
-  input_path="${input_path#./}"
-  echo "${input_path}"
-}
-
-# @cmd Read a file's contents before modifying
-# @option --path! Path to the file (relative to project root)
-read_file() {
-  local file_path
-	# shellcheck disable=SC2154
-  file_path=$(_normalize_path "${argc_path}")
-  local project_dir
-  project_dir=$(_project_dir)
-  local full_path="${project_dir}/${file_path}"
-  
-  if [[ ! -f "${full_path}" ]]; then
-    warn "File not found: ${file_path}" >> "$LLM_OUTPUT"
-    return 0
-  fi
-  
-  {
-  	info "Reading: ${file_path}"
-  	echo ""
-  	cat "${full_path}"
-  } >> "$LLM_OUTPUT"
-}
-
-# @cmd Write complete file contents
-# @option --path! Path for the file (relative to project root)
-# @option --content! Complete file contents to write
-write_file() {
-  local file_path
-  file_path=$(_normalize_path "${argc_path}")
-  # shellcheck disable=SC2154
-  local content="${argc_content}"
-  local project_dir
-  project_dir=$(_project_dir)
-  local full_path="${project_dir}/${file_path}"
-  
-  mkdir -p "$(dirname "${full_path}")"
-  printf '%s' "${content}" > "${full_path}"
-  
-  green "Wrote: ${file_path}" >> "$LLM_OUTPUT"
-}
-
-# @cmd Find files similar to a given path (for pattern matching)
-# @option --path! Path to find similar files for
-find_similar_files() {
-  local file_path
-  file_path=$(_normalize_path "${argc_path}")
-  local project_dir
-  project_dir=$(_project_dir)
-  
-  local ext="${file_path##*.}"
-  local dir
-  dir=$(dirname "${file_path}")
-  
-  info "Similar files to: ${file_path}" >> "$LLM_OUTPUT"
-  echo "" >> "$LLM_OUTPUT"
-  
-  local results
-  results=$(find "${project_dir}/${dir}" -maxdepth 1 -type f -name "*.${ext}" \
-    ! -name "$(basename "${file_path}")" \
-    ! -name "*test*" \
-    ! -name "*spec*" \
-    2>/dev/null | sed "s|^${project_dir}/||" | head -3)
-  
-  if [[ -z "${results}" ]]; then
-    results=$(find "${project_dir}/src" -type f -name "*.${ext}" \
-      ! -name "*test*" \
-      ! -name "*spec*" \
-      -not -path '*/target/*' \
-      2>/dev/null | sed "s|^${project_dir}/||" | head -3)
-  fi
-  
-  if [[ -n "${results}" ]]; then
-    echo "${results}" >> "$LLM_OUTPUT"
-  else
-    warn "No similar files found" >> "$LLM_OUTPUT"
-  fi
-}
-
 # @cmd Verify the project builds successfully
 verify_build() {
   local project_dir
@@ -189,28 +96,3 @@ get_project_structure() {
   } >> "$LLM_OUTPUT"
 }
 
-# @cmd Search for content in the codebase
-# @option --pattern! Pattern to search for
-search_code() {
-	# shellcheck disable=SC2154
-  local pattern="${argc_pattern}"
-  local project_dir
-  project_dir=$(_project_dir)
-  
-  info "Searching: ${pattern}" >> "$LLM_OUTPUT"
-  echo "" >> "$LLM_OUTPUT"
-  
-  local results
-  results=$(grep -rn "${pattern}" "${project_dir}" 2>/dev/null | \
-    grep -v '/target/' | \
-    grep -v '/node_modules/' | \
-    grep -v '/.git/' | \
-    sed "s|^${project_dir}/||" | \
-    head -20) || true
-  
-  if [[ -n "${results}" ]]; then
-    echo "${results}" >> "$LLM_OUTPUT"
-  else
-    warn "No matches" >> "$LLM_OUTPUT"
-  fi
-}