Files
llama.cpp/tools/server/server-tools.cpp
Pascal f9e832c10e server: harden the file_glob_search directory walk (#26626)
* server: don't walk Windows junctions in file_glob_search

std::filesystem reports a junction as a plain directory, so the symlink
guard misses it and a junction pointing back at an ancestor is walked
until the path length gives out

read the reparse tag and treat a symlink and a mount point as links,
leaving any other reparse point walkable so cloud placeholders and dedup
stubs still get searched

look junk directory names up case insensitively on Windows, where NTFS
makes Build the same directory as build

test that a junk directory stays selectable while its contents stay out
of search results

* server: report a directory the walk could not read

a directory that fails to open or to iterate was skipped in silence, so
a caller got a listing that looked complete while a whole subtree was
missing: a path over the platform limit, a volume going away, a name the
filesystem rejects

skip_permission_denied never reaches this path, so an error here is an
incomplete answer rather than a deliberate omission, and it now sets the
truncated flag

* server: simplify the file_glob_search listing plumbing

return a small result struct instead of two out params and a caller path
that only fed an error string, taking list_entries from six parameters
down to three

scope the error code to the directory being read, act on the status code
the entry lookups already returned, and treat an unreadable link state as
a link so the walk never descends on a guess

check the deadline when a directory is popped, not only per entry, so a
tree of empty directories cannot outlive the budget

read the path parameter once, and reject an invalid limit the way an
invalid type is already rejected, instead of silently falling back

normalize the resolved path, so a "." or ".." a caller typed reaches
neither git nor the client, and return the generic path form with '/'
separators on every platform, so the base sent to clients no longer needs
a local fixup

* ui: expire cached picker searches

the cache grew for the lifetime of the component: entries went stale
after the TTL but were never removed, so every distinct query typed in a
session stayed in memory

drop expired entries when a new result is stored

* server: address review from @ngxson

trim comments to one line each, and drop two that restate the code

rename junk_lookup_name to get_effective_name, and move it and the link
check to private static members next to junk_dir_names

merge the Windows and Linux link checks into one is_link, so symlinks are
checked everywhere and junctions only add to it on Windows

* server: convert tool paths as UTF-8 on Windows

a narrow path uses the active code page there, so a file name came back
mangled and a path with an accent could not be opened at all

convert explicitly at every crossing between a std::string, which always
carries UTF-8 here, and fs::path

read the home directory through the wide environment, since the narrow
one returns the profile path in the active code page too

the walker no longer normalizes separators by hand, since paths now come
back in generic form

* server: fold the platform branch inside console_output_to_utf8

match the shape of the other helpers, one definition with the #if inside,
instead of two definitions wrapped in #if and #else

inline the single caller helper and trim the comment
2026-08-05 21:31:54 +02:00

1656 lines
64 KiB
C++

#include "server-tools.h"
#include "subproc.h"
#include <filesystem>
#include <fstream>
#include <regex>
#include <thread>
#include <chrono>
#include <ctime>
#include <atomic>
#include <cstring>
#include <cstdlib>
#include <algorithm>
#include <unordered_set>
#include <tuple>
#include <functional>
#include <memory>
#if defined(_WIN32)
# ifndef NOMINMAX
# define NOMINMAX
# endif
# include <windows.h>
#endif
namespace fs = std::filesystem;
//
// internal helpers
//
// a child process writes in the OEM code page, so accented output would reach
// the JSON layer as invalid bytes. run() spawns without a console, so the
// console code page never applies
static std::string console_output_to_utf8(const std::string & text) {
#if defined(_WIN32)
// a chunk can end mid sequence, so the incomplete tail is dropped first
if (text.empty() || is_valid_utf8(text.substr(0, validate_utf8(text)))) {
// never decode twice a child that already emits UTF-8
return text;
}
const UINT cp = GetOEMCP();
// fail rather than emit replacement characters when the code page is wrong
const int wide_len = MultiByteToWideChar(cp, MB_ERR_INVALID_CHARS, text.data(), (int) text.size(), nullptr, 0);
if (wide_len <= 0) {
return text;
}
std::wstring wide(wide_len, L'\0');
MultiByteToWideChar(cp, MB_ERR_INVALID_CHARS, text.data(), (int) text.size(), wide.data(), wide_len);
const int utf8_len = WideCharToMultiByte(CP_UTF8, 0, wide.data(), wide_len, nullptr, 0, nullptr, nullptr);
if (utf8_len <= 0) {
return text;
}
std::string utf8(utf8_len, '\0');
WideCharToMultiByte(CP_UTF8, 0, wide.data(), wide_len, utf8.data(), utf8_len, nullptr, nullptr);
return utf8;
#else
return text;
#endif
}
json server_tool::to_json() const {
return {
{"display_name", display_name},
{"tool", name},
{"type", type()},
{"permissions", json{
{"write", permission_write}
}},
{"definition", get_definition()},
};
}
static constexpr size_t SERVER_TOOL_GIT_LS_FILES_MAX_OUTPUT = 8 * 1024 * 1024; // 8 MB
// budget for one listing call, shared by the git and walker paths
static constexpr int SERVER_TOOL_LIST_ENTRIES_TIMEOUT = 15; // seconds
// entry kinds a directory listing may return
enum class list_kind {
files, // regular files only
dirs, // directories only
all, // both
};
// a narrow path uses the active code page on Windows, so every crossing between
// a std::string (always UTF-8 here) and fs::path is converted explicitly
static fs::path path_from_utf8(const std::string & s) {
return fs::u8path(s);
}
// '/' separators on every platform: Windows accepts them, the web UI needs them
static std::string path_to_utf8(const fs::path & p) {
const auto s = p.generic_u8string();
return std::string(s.begin(), s.end());
}
// home directory, read once at first use (getenv is not thread safe against setenv)
static const std::string & home_dir() {
static const std::string home = [] {
#ifdef _WIN32
// the narrow getenv would return the profile path in the active code page
const wchar_t * w = _wgetenv(L"HOME");
if (w == nullptr) w = _wgetenv(L"USERPROFILE");
return w ? path_to_utf8(fs::path(w)) : std::string();
#else
const char * h = getenv("HOME");
return h ? std::string(h) : std::string();
#endif
}();
return home;
}
static std::string expand_home(const std::string & path) {
if (path.empty() || path[0] != '~') return path;
if (path.size() > 1 && path[1] != '/' && path[1] != '\\') return path;
const std::string & home = home_dir();
if (home.empty()) return path;
return home + path.substr(1);
}
// depth of a '/'-separated relative path: "a/b/c" is 3
static int entry_depth(const std::string & rel) {
return 1 + (int) std::count(rel.begin(), rel.end(), '/');
}
class tools_io {
public:
struct exec_result {
std::string output;
int exit_code = -1;
bool timed_out = false;
};
virtual ~tools_io() = default;
virtual bool is_directory(const std::string & path) const = 0;
virtual bool is_regular_file(const std::string & path) const = 0;
virtual bool file_size(const std::string & path, uintmax_t & out_size) const = 0;
virtual bool read_file(const std::string & path, std::string & out) const = 0;
virtual bool write_file(const std::string & path, const std::string & content) const = 0;
// resolve `path` against the IO's working directory; absolute paths are returned unchanged
virtual std::string resolve(const std::string & path) const = 0;
struct list_entry {
std::string rel; // '/'-separated, relative to `base`
bool is_dir = false;
};
struct list_result {
std::vector<list_entry> entries;
std::string err; // set when `base` is not a directory
bool truncated = false; // set when the walk could not see everything
};
// entries relative to `base`, which must already be resolved (absolute)
// max_depth == 0 means unlimited, 1 means direct children of `base` only
virtual list_result list_entries(const std::string & base, int max_depth, list_kind kind) const = 0;
// on_chunk, if set, is called with each chunk of output as it is read (before truncation cuts in);
// returning false terminates the process early (e.g. the client disconnected)
virtual exec_result run(
const std::vector<std::string> & args,
size_t max_output,
int timeout_secs,
const std::function<bool(const std::string &)> & on_chunk = nullptr) const = 0;
};
class tools_io_basic : public tools_io {
public:
// cwd, if non-empty, is used to resolve relative paths and as the working directory for run()
explicit tools_io_basic(std::string cwd = "") : cwd(std::move(cwd)) {}
// expands a leading `~`, then resolves `path` against `cwd` (or the server
// working directory when `cwd` is unset); the result is always absolute
std::string resolve(const std::string & path) const override {
const std::string p = expand_home(path);
fs::path full = path_from_utf8(p);
if (!full.is_absolute()) {
if (cwd.empty()) {
std::error_code ec;
const fs::path cur = fs::current_path(ec);
if (ec) return p;
full = cur / full;
} else {
full = path_from_utf8(cwd) / full;
}
}
// drop "." and ".." so they never reach git or the client
full = full.lexically_normal();
// a trailing ".." normalizes to a path that ends with a separator
if (!full.has_filename() && full != full.root_path()) {
full = full.parent_path();
}
return path_to_utf8(full);
}
bool is_directory(const std::string & path) const override {
std::error_code ec;
return fs::is_directory(path_from_utf8(resolve(path)), ec) && !ec;
}
bool is_regular_file(const std::string & path) const override {
std::error_code ec;
return fs::is_regular_file(path_from_utf8(resolve(path)), ec) && !ec;
}
bool file_size(const std::string & path, uintmax_t & out_size) const override {
std::error_code ec;
out_size = fs::file_size(path_from_utf8(resolve(path)), ec);
return !ec;
}
bool read_file(const std::string & path, std::string & out) const override {
std::ifstream f(path_from_utf8(resolve(path)), std::ios::binary);
if (!f) return false;
std::ostringstream ss;
ss << f.rdbuf();
out = ss.str();
return true;
}
bool write_file(const std::string & path, const std::string & content) const override {
std::error_code ec;
fs::path fpath = path_from_utf8(resolve(path));
if (fpath.has_parent_path()) {
fs::create_directories(fpath.parent_path(), ec);
if (ec) return false;
}
std::ofstream f(fpath, std::ios::binary);
if (!f) return false;
f << content;
return (bool) f;
}
list_result list_entries(const std::string & base, int max_depth, list_kind kind) const override {
list_result out;
std::error_code ec;
if (!fs::is_directory(base, ec) || ec) {
out.err = "path does not exist or is not a directory";
return out;
}
const auto deadline = std::chrono::steady_clock::now() + std::chrono::seconds(SERVER_TOOL_LIST_ENTRIES_TIMEOUT);
// git ls-files cannot list directories; use the walker when they are requested
if (kind == list_kind::files) {
auto res = run(
{"git", "-C", base, "ls-files", "--cached", "--others", "--exclude-standard"},
SERVER_TOOL_GIT_LS_FILES_MAX_OUTPUT, SERVER_TOOL_LIST_ENTRIES_TIMEOUT);
if (res.exit_code == 0 && !res.timed_out) {
std::istringstream iss(res.output);
std::string line;
while (std::getline(iss, line)) {
if (!line.empty() && line.back() == '\r') line.pop_back();
if (line.empty()) continue;
std::replace(line.begin(), line.end(), '\\', '/');
if (max_depth > 0 && entry_depth(line) > max_depth) continue;
if (is_regular_file(path_to_utf8(path_from_utf8(base) / path_from_utf8(line)))) {
out.entries.push_back({line, false});
}
}
return out;
}
}
out.entries = list_entries_fallback(base, max_depth, kind, deadline, out.truncated);
return out;
}
exec_result run(
const std::vector<std::string> & args,
size_t max_output,
int timeout_secs,
const std::function<bool(const std::string &)> & on_chunk = nullptr) const override {
exec_result res;
common_subproc proc;
int options = subprocess_option_no_window
| subprocess_option_combined_stdout_stderr
| subprocess_option_inherit_environment
| subprocess_option_search_user_path;
if (!proc.create(args, options, {}, cwd.empty() ? nullptr : cwd.c_str())) {
res.output = "failed to spawn process";
return res;
}
std::atomic<bool> done{false};
std::atomic<bool> timed_out{false};
std::thread timeout_thread([&]() {
auto deadline = std::chrono::steady_clock::now() + std::chrono::seconds(timeout_secs);
while (!done.load()) {
if (std::chrono::steady_clock::now() >= deadline) {
timed_out.store(true);
proc.terminate();
return;
}
std::this_thread::sleep_for(std::chrono::milliseconds(100));
}
});
FILE * f = proc.stdout_file();
std::string output;
bool truncated = false;
if (f) {
char buf[4096];
while (fgets(buf, sizeof(buf), f) != nullptr) {
if (!truncated) {
size_t len = strlen(buf);
if (output.size() + len <= max_output) {
output.append(buf, len);
if (on_chunk && !on_chunk(console_output_to_utf8(std::string(buf, len)))) {
proc.terminate();
break;
}
} else {
size_t remaining = max_output - output.size();
output.append(buf, remaining);
if (on_chunk && remaining > 0) on_chunk(console_output_to_utf8(std::string(buf, remaining)));
truncated = true;
}
}
}
}
done.store(true);
if (timeout_thread.joinable()) {
timeout_thread.join();
}
res.exit_code = proc.join();
res.output = console_output_to_utf8(output);
res.timed_out = timed_out.load();
if (truncated) {
res.output += "\n[output truncated]";
}
return res;
}
private:
std::string cwd;
// a link can point back to an ancestor and loop forever, so it is never walked
static bool is_link(const fs::directory_entry & entry) {
std::error_code ec;
if (entry.is_symlink(ec) || ec) {
return true;
}
#if defined(_WIN32)
// a junction looks like a plain directory to std::filesystem, so read the reparse tag
WIN32_FIND_DATAW data;
const HANDLE h = FindFirstFileW(entry.path().c_str(), &data);
if (h == INVALID_HANDLE_VALUE) {
return false;
}
FindClose(h);
if ((data.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) == 0) {
return false;
}
// other reparse points (cloud placeholder, dedup stub) are real directories
return data.dwReserved0 == IO_REPARSE_TAG_SYMLINK || data.dwReserved0 == IO_REPARSE_TAG_MOUNT_POINT;
#else
return false;
#endif
}
// NTFS is case insensitive, so Build and build are the same directory
static std::string get_effective_name(const std::string & fname) {
#if defined(_WIN32)
std::string lowered = fname;
std::transform(lowered.begin(), lowered.end(), lowered.begin(),
[](unsigned char c) { return (char) std::tolower(c); });
return lowered;
#else
return fname;
#endif
}
static const std::unordered_set<std::string> & junk_dir_names() {
static const std::unordered_set<std::string> names = {
".git", ".svn", ".hg", "node_modules", "__pycache__",
".venv", "venv", "dist", "build", "target", ".cache", ".idea", ".vscode",
};
return names;
}
std::vector<list_entry> list_entries_fallback(const std::string & base, int max_depth, list_kind kind,
std::chrono::steady_clock::time_point deadline, bool & truncated) const {
std::vector<list_entry> result;
std::vector<std::tuple<fs::path, fs::path, int>> stack;
stack.emplace_back(path_from_utf8(base), fs::path(), 0);
while (!stack.empty()) {
if (std::chrono::steady_clock::now() >= deadline) {
truncated = true;
return result;
}
auto [dir, rel_dir, depth] = std::move(stack.back());
stack.pop_back();
std::error_code ec;
// step the iterator by hand: the throwing increment escapes on a directory that goes away
fs::directory_iterator it(dir, fs::directory_options::skip_permission_denied, ec);
// permission errors are skipped above, so this is a subtree the caller never sees
if (ec) {
truncated = true;
continue;
}
for (const fs::directory_iterator end; it != end; it.increment(ec)) {
if (ec) {
truncated = true;
break;
}
if (std::chrono::steady_clock::now() >= deadline) {
truncated = true;
return result;
}
const fs::directory_entry & entry = *it;
const fs::path fname = entry.path().filename();
std::error_code tec;
const bool is_dir = entry.is_directory(tec);
if (tec) continue;
if (is_dir) {
if (kind == list_kind::dirs || kind == list_kind::all) {
result.push_back({path_to_utf8(rel_dir / fname), true});
}
// junk directories stay selectable but are never walked: they can be enormous
if (junk_dir_names().count(get_effective_name(path_to_utf8(fname))) > 0) continue;
if (!is_link(entry) && (max_depth == 0 || depth + 1 < max_depth)) {
stack.emplace_back(entry.path(), rel_dir / fname, depth + 1);
}
} else if (entry.is_regular_file(tec)) {
if (kind == list_kind::files || kind == list_kind::all) {
result.push_back({path_to_utf8(rel_dir / fname), false});
}
}
}
}
return result;
}
};
static std::unique_ptr<tools_io> make_tools_io(const json & params) {
std::string cwd = json_value(params, "cwd", std::string());
return std::make_unique<tools_io_basic>(cwd);
}
// no '/' in pattern -> match basename at any depth; else match full relative path
static bool path_glob_match(const std::string & pattern, const std::string & rel_path) {
if (pattern.find('/') == std::string::npos) {
return glob_match(pattern, path_to_utf8(path_from_utf8(rel_path).filename()));
}
if (pattern == "**" || pattern.rfind("**/", 0) == 0 || pattern.rfind('/', 0) == 0) {
return glob_match(pattern, rel_path);
}
return glob_match("**/" + pattern, rel_path);
}
//
// read_file: read a file with optional line range and line-number prefix
//
static constexpr size_t SERVER_TOOL_READ_FILE_MAX_SIZE = 16 * 1024; // 16 KB
struct server_tool_read_file : server_tool {
server_tool_read_file() {
name = "read_file";
display_name = "Read file";
permission_write = false;
}
json get_definition() const override {
return {
{"type", "function"},
{"function", {
{"name", name},
{"description", "Read the contents of a file. Optionally specify a 1-based line range. "
"If append_loc is true, each line is prefixed with its line number (e.g. \"1\u2192...\")."},
{"parameters", {
{"type", "object"},
{"properties", {
{"path", {{"type", "string"}, {"description", "Path to the file"}}},
{"start_line", {{"type", "integer"}, {"description", "First line to read, 1-based (default: 1)"}}},
{"end_line", {{"type", "integer"}, {"description", "Last line to read, 1-based inclusive (default: end of file)"}}},
{"append_loc", {{"type", "boolean"}, {"description", "Prefix each line with its line number"}}},
}},
{"required", json::array({"path"})},
}},
}},
};
}
json invoke(json params, server_tool::stream *) const override {
std::string path = params.at("path").get<std::string>();
int start_line = json_value(params, "start_line", 1);
int end_line = json_value(params, "end_line", -1); // -1 = no limit
bool append_loc = json_value(params, "append_loc", false);
auto io = make_tools_io(params);
uintmax_t file_size = 0;
if (!io->file_size(path, file_size)) {
return {{"error", "cannot stat file: " + path}};
}
if (file_size > SERVER_TOOL_READ_FILE_MAX_SIZE && end_line == -1) {
return {{"error", string_format(
"file too large (%zu bytes, max %zu). Use start_line/end_line to read a portion.",
(size_t)file_size, SERVER_TOOL_READ_FILE_MAX_SIZE)}};
}
std::string content;
if (!io->read_file(path, content)) {
return {{"error", "failed to open file: " + path}};
}
std::istringstream f(content);
std::string result;
std::string line;
int lineno = 0;
while (std::getline(f, line)) {
lineno++;
if (lineno < start_line) continue;
if (end_line != -1 && lineno > end_line) break;
std::string out_line;
if (append_loc) {
out_line = std::to_string(lineno) + "\u2192" + line + "\n";
} else {
out_line = line + "\n";
}
if (result.size() + out_line.size() > SERVER_TOOL_READ_FILE_MAX_SIZE) {
result += "[output truncated]";
break;
}
result += out_line;
}
return {{"plain_text_response", result}};
}
};
//
// file_glob_search: find files matching a glob pattern under a base directory
//
static constexpr int SERVER_TOOL_FILE_SEARCH_MAX_RESULTS = 100;
static constexpr const char * SERVER_TOOL_FILE_SEARCH_TYPE_FILE = "file";
static constexpr const char * SERVER_TOOL_FILE_SEARCH_TYPE_DIR = "dir";
static constexpr const char * SERVER_TOOL_FILE_SEARCH_TYPE_ALL = "all";
struct server_tool_file_glob_search : server_tool {
server_tool_file_glob_search() {
name = "file_glob_search";
display_name = "File search";
permission_write = false;
}
json get_definition() const override {
return {
{"type", "function"},
{"function", {
{"name", name},
{"description",
"Recursively search for files matching a glob pattern under a directory. "
"Automatically skips files ignored by .gitignore (when the directory is inside a git repo) "
"and common junk directories (.git, node_modules, build, dist, etc.) otherwise. "
"A pattern with no '/' (e.g. \"*.cpp\") matches the file's basename at any depth. "
"A pattern containing '/' matches the full relative path; unless already anchored with "
"\"**/\" or a leading '/', it is automatically prefixed with \"**/\". "
"Use type=\"dir\" or \"all\" to also list directories; directory entries are suffixed with '/' in the output. "
"Note: directory listings do not apply .gitignore filtering."},
{"parameters", {
{"type", "object"},
{"properties", {
{"path", {{"type", "string"}, {"description", "Base directory to search in"}}},
{"include", {{"type", "string"}, {"description", "Glob pattern for files to include (e.g. \"*.cpp\" or \"src/**/*.cpp\"). Default: **"}}},
{"exclude", {{"type", "string"}, {"description", "Glob pattern for files to exclude"}}},
{"type", {{"type", "string"}, {"description", "Entry type to return: \"file\" (default), \"dir\" or \"all\""}}},
{"max_depth", {{"type", "integer"}, {"description", "Maximum depth to descend into subdirectories (default: 0 = unlimited; 1 = direct children only)"}}},
{"limit", {{"type", "integer"}, {"description", string_format("Maximum number of results to return, capped at %d (default %d)", SERVER_TOOL_FILE_SEARCH_MAX_RESULTS, SERVER_TOOL_FILE_SEARCH_MAX_RESULTS)}}},
}},
{"required", json::array({"path"})},
}},
}},
};
}
json invoke(json params, server_tool::stream *) const override {
auto io = make_tools_io(params);
const std::string path = params.at("path").get<std::string>();
std::string base = io->resolve(path);
std::string include = json_value(params, "include", std::string("**"));
std::string exclude = json_value(params, "exclude", std::string(""));
std::string type = json_value(params, "type", std::string("file"));
int max_depth = std::max(0, json_value(params, "max_depth", 0));
const int limit_req = json_value(params, "limit", SERVER_TOOL_FILE_SEARCH_MAX_RESULTS);
if (limit_req < 1) {
return {{"error", "invalid limit: " + std::to_string(limit_req) + " (expected 1 or more)"}};
}
const int limit = std::min(limit_req, SERVER_TOOL_FILE_SEARCH_MAX_RESULTS);
list_kind kind;
if (type == SERVER_TOOL_FILE_SEARCH_TYPE_FILE) {
kind = list_kind::files;
} else if (type == SERVER_TOOL_FILE_SEARCH_TYPE_DIR) {
kind = list_kind::dirs;
} else if (type == SERVER_TOOL_FILE_SEARCH_TYPE_ALL) {
kind = list_kind::all;
} else {
return {{"error", "invalid type: " + type + " (expected \"file\", \"dir\" or \"all\")"}};
}
const auto listing = io->list_entries(base, max_depth, kind);
if (!listing.err.empty()) {
return {{"error", listing.err + ": " + path}};
}
std::vector<tools_io::list_entry> matches;
for (const auto & entry : listing.entries) {
if (!path_glob_match(include, entry.rel)) continue;
if (!exclude.empty() && path_glob_match(exclude, entry.rel)) continue;
matches.push_back(entry);
}
size_t total = matches.size();
size_t shown = std::min(total, (size_t) limit);
std::ostringstream output_text;
json entries_json = json::array();
for (size_t i = 0; i < shown; i++) {
output_text << matches[i].rel << (matches[i].is_dir ? "/" : "") << "\n";
entries_json.push_back({
{"path", matches[i].rel},
{"type", matches[i].is_dir ? "dir" : "file"},
});
}
output_text << "\n---\nTotal matches: " << total << "\n";
if (total > shown) {
output_text << string_format(
"[%zu results limit reached (%zu total matches). Refine the glob pattern to narrow the search.]\n",
shown, total);
}
if (listing.truncated) {
output_text << "[results truncated: time budget or unreadable directory]\n";
}
// `base` is always absolute (resolve falls back to the server cwd), so
// API clients (e.g. the web UI picker) can join the relative entries
// into absolute paths. `plain_text_response` is what the model sees;
// `entries` is the same data as structured JSON for the UI picker,
// which reads `entries`/`base` instead of re-parsing the text.
return {{"plain_text_response", output_text.str()}, {"entries", entries_json}, {"base", base}};
}
};
//
// grep_search: search for a regex pattern in files
//
static constexpr size_t SERVER_TOOL_GREP_SEARCH_MAX_RESULTS = 100;
struct server_tool_grep_search : server_tool {
server_tool_grep_search() {
name = "grep_search";
display_name = "Grep search";
permission_write = false;
}
json get_definition() const override {
return {
{"type", "function"},
{"function", {
{"name", name},
{"description",
"Search for a pattern in files under a path. Returns matching lines with file paths "
"(and, unless searching a single file, paths relative to the given directory). "
"Automatically skips files ignored by .gitignore (when the directory is inside a git repo) "
"and common junk directories (.git, node_modules, build, dist, etc.) otherwise. "
"include/exclude: a pattern with no '/' matches the basename at any depth; a pattern "
"containing '/' matches the full relative path (auto-anchored with \"**/\" unless already anchored)."},
{"parameters", {
{"type", "object"},
{"properties", {
{"path", {{"type", "string"}, {"description", "File or directory to search in"}}},
{"pattern", {{"type", "string"}, {"description", "Pattern to search for (regular expression unless literal is true)"}}},
{"include", {{"type", "string"}, {"description", "Glob pattern to filter files (default: **)"}}},
{"exclude", {{"type", "string"}, {"description", "Glob pattern to exclude files"}}},
{"return_line_numbers", {{"type", "boolean"}, {"description", "If true, include line numbers in results"}}},
{"literal", {{"type", "boolean"}, {"description", "Treat pattern as a literal string instead of a regular expression (default: false)"}}},
{"ignore_case", {{"type", "boolean"}, {"description", "Case-insensitive search (default: false)"}}},
{"context_lines", {{"type", "integer"}, {"description", "Number of lines of context to show before and after each match (default: 0)"}}},
}},
{"required", json::array({"path", "pattern"})},
}},
}},
};
}
json invoke(json params, server_tool::stream *) const override {
std::string path = params.at("path").get<std::string>();
std::string pat_str = params.at("pattern").get<std::string>();
std::string include = json_value(params, "include", std::string("**"));
std::string exclude = json_value(params, "exclude", std::string(""));
bool show_lineno = json_value(params, "return_line_numbers", false);
bool literal = json_value(params, "literal", false);
bool ignore_case = json_value(params, "ignore_case", false);
int ctx_lines = std::max(0, json_value(params, "context_lines", 0));
std::string pattern_src = pat_str;
if (literal) {
static const std::string specials = "\\^$.|?*+()[]{}";
std::string escaped;
escaped.reserve(pat_str.size() * 2);
for (char c : pat_str) {
if (specials.find(c) != std::string::npos) escaped += '\\';
escaped += c;
}
pattern_src = escaped;
}
std::regex pattern;
try {
auto flags = std::regex::ECMAScript;
if (ignore_case) flags |= std::regex::icase;
pattern = std::regex(pattern_src, flags);
} catch (const std::regex_error & e) {
return {{"error", std::string("invalid regex: ") + e.what()}};
}
auto io = make_tools_io(params);
// collect (absolute_path, display_path) pairs to search
std::vector<std::pair<std::string, std::string>> files;
const std::string abs_path = io->resolve(path);
if (io->is_regular_file(abs_path)) {
files.emplace_back(abs_path, path);
} else if (io->is_directory(abs_path)) {
const auto listing = io->list_entries(abs_path, 0, list_kind::files);
if (!listing.err.empty()) {
return {{"error", listing.err + ": " + path}};
}
for (const auto & entry : listing.entries) {
if (!path_glob_match(include, entry.rel)) continue;
if (!exclude.empty() && path_glob_match(exclude, entry.rel)) continue;
files.emplace_back(path_to_utf8(path_from_utf8(abs_path) / path_from_utf8(entry.rel)), entry.rel);
}
} else {
return {{"error", "path does not exist: " + path}};
}
std::ostringstream output_text;
size_t total = 0;
bool limit_reached = false;
bool show_num = show_lineno || ctx_lines > 0;
for (const auto & file_entry : files) {
if (limit_reached) break;
const std::string & fpath = file_entry.first;
const std::string & display_path = file_entry.second;
std::string content;
if (!io->read_file(fpath, content)) continue;
std::vector<std::string> lines;
{
std::istringstream f(content);
std::string line;
while (std::getline(f, line)) lines.push_back(line);
}
for (size_t i = 0; i < lines.size(); i++) {
if (total >= SERVER_TOOL_GREP_SEARCH_MAX_RESULTS) {
limit_reached = true;
break;
}
if (!std::regex_search(lines[i], pattern)) continue;
long ctx_start = ctx_lines > 0 ? std::max<long>(0, (long) i - ctx_lines) : (long) i;
long ctx_end = ctx_lines > 0 ? std::min<long>((long) lines.size() - 1, (long) i + ctx_lines) : (long) i;
for (long j = ctx_start; j <= ctx_end; j++) {
bool is_match = (j == (long) i);
output_text << display_path << (is_match ? ':' : '-');
if (show_num) {
output_text << (j + 1) << (is_match ? ':' : '-');
}
output_text << lines[j] << "\n";
}
if (ctx_lines > 0) {
output_text << "--\n";
}
total++;
}
}
output_text << "\n---\nTotal matches: " << total << "\n";
if (limit_reached) {
output_text << string_format(
"[%zu matches limit reached. Narrow the path/pattern/include to see more.]\n",
SERVER_TOOL_GREP_SEARCH_MAX_RESULTS);
}
return {{"plain_text_response", output_text.str()}};
}
};
//
// exec_shell_command: run an arbitrary shell command
//
static constexpr size_t SERVER_TOOL_EXEC_SHELL_COMMAND_MAX_OUTPUT_SIZE = 16 * 1024; // 16 KB
static constexpr int SERVER_TOOL_EXEC_SHELL_COMMAND_MAX_TIMEOUT = 60; // seconds
struct server_tool_exec_shell_command : server_tool {
server_tool_exec_shell_command() {
name = "exec_shell_command";
display_name = "Execute shell command";
permission_write = true;
support_stream = true;
}
json get_definition() const override {
return {
{"type", "function"},
{"function", {
{"name", name},
{"description", "Execute a shell command and return its output (stdout and stderr combined)."},
{"parameters", {
{"type", "object"},
{"properties", {
{"command", {{"type", "string"}, {"description", "Shell command to execute"}}},
{"timeout", {{"type", "integer"}, {"description", string_format("Timeout in seconds (default 10, max %d)", SERVER_TOOL_EXEC_SHELL_COMMAND_MAX_TIMEOUT)}}},
{"max_output_size", {{"type", "integer"}, {"description", string_format("Maximum output size in bytes (default %zu)", SERVER_TOOL_EXEC_SHELL_COMMAND_MAX_OUTPUT_SIZE)}}},
}},
{"required", json::array({"command"})},
}},
}},
};
}
json invoke(json params, server_tool::stream * st) const override {
std::string command = params.at("command").get<std::string>();
int timeout = json_value(params, "timeout", 10);
size_t max_output = (size_t) json_value(params, "max_output_size", (int) SERVER_TOOL_EXEC_SHELL_COMMAND_MAX_OUTPUT_SIZE);
timeout = std::min(timeout, SERVER_TOOL_EXEC_SHELL_COMMAND_MAX_TIMEOUT);
max_output = std::min(max_output, SERVER_TOOL_EXEC_SHELL_COMMAND_MAX_OUTPUT_SIZE);
#ifdef _WIN32
std::vector<std::string> args = {"cmd", "/c", command};
#else
std::vector<std::string> args = {"sh", "-c", command};
#endif
auto io = make_tools_io(params);
if (st) {
auto res = io->run(args, max_output, timeout, [st](const std::string & chunk) {
st->push(chunk);
return !st->alive || st->alive();
});
if (st->alive && !st->alive()) {
return json();
}
std::string tail = string_format("\n[exit code: %d]", res.exit_code);
if (res.timed_out) {
tail += " [exit due to timed out]";
}
st->push(tail);
return json();
}
auto res = io->run(args, max_output, timeout);
std::string text_output = res.output;
text_output += string_format("\n[exit code: %d]", res.exit_code);
if (res.timed_out) {
text_output += " [exit due to timed out]";
}
return {{"plain_text_response", text_output}};
}
};
//
// write_file: create or overwrite a file
//
struct server_tool_write_file : server_tool {
server_tool_write_file() {
name = "write_file";
display_name = "Write file";
permission_write = true;
}
json get_definition() const override {
return {
{"type", "function"},
{"function", {
{"name", name},
{"description", "Write content to a file, creating it (including parent directories) if it does not exist. May use with edit_file for more complex edits."},
{"parameters", {
{"type", "object"},
{"properties", {
{"path", {{"type", "string"}, {"description", "Path of the file to write"}}},
{"content", {{"type", "string"}, {"description", "Content to write"}}},
}},
{"required", json::array({"path", "content"})},
}},
}},
};
}
json invoke(json params, server_tool::stream *) const override {
std::string path = params.at("path").get<std::string>();
std::string content = params.at("content").get<std::string>();
auto io = make_tools_io(params);
if (!io->write_file(path, content)) {
return {{"error", "failed to write file: " + path}};
}
return {{"result", "file written successfully"}, {"path", path}, {"bytes", content.size()}};
}
};
//
// edit_file: exact text replacement, one or more edits per call
//
struct server_tool_edit_file : server_tool {
server_tool_edit_file() {
name = "edit_file";
display_name = "Edit file";
permission_write = true;
}
json get_definition() const override {
return {
{"type", "function"},
{"function", {
{"name", name},
{"description",
"Edit a file using exact text replacement. Each edits[].old_text must be unique in the file "
"and is matched against the original content, not incrementally. Merge nearby changes into "
"one edit instead of overlapping edits. Use write_file to replace the whole file."},
{"parameters", {
{"type", "object"},
{"properties", {
{"path", {{"type", "string"}, {"description", "Path to the file to edit"}}},
{"edits", {
{"type", "array"},
{"description", "One or more exact text replacements to apply"},
{"items", {
{"type", "object"},
{"properties", {
{"old_text", {{"type", "string"}, {"description", "Exact text to find; must be unique in the file and must not overlap with other edits"}}},
{"new_text", {{"type", "string"}, {"description", "Text to replace old_text with"}}},
}},
{"required", json::array({"old_text", "new_text"})},
}},
}},
}},
{"required", json::array({"path", "edits"})},
}},
}},
};
}
json invoke(json params, server_tool::stream *) const override {
std::string path = params.at("path").get<std::string>();
const json & edits_json = params.at("edits");
if (!edits_json.is_array() || edits_json.empty()) {
return {{"error", "\"edits\" must be a non-empty array"}};
}
struct edit_req {
std::string old_text;
std::string new_text;
};
std::vector<edit_req> edits;
edits.reserve(edits_json.size());
for (const auto & e : edits_json) {
edit_req er;
er.old_text = e.at("old_text").get<std::string>();
er.new_text = e.at("new_text").get<std::string>();
if (er.old_text.empty()) {
return {{"error", string_format("edits[%zu].old_text must not be empty", edits.size())}};
}
edits.push_back(std::move(er));
}
auto io = make_tools_io(params);
std::string original_content;
if (!io->read_file(path, original_content)) {
return {{"error", "failed to open file: " + path}};
}
// does any old_text need fuzzy matching (no exact match found)?
bool any_fuzzy = false;
for (size_t i = 0; i < edits.size(); i++) {
if (original_content.find(edits[i].old_text) != std::string::npos) continue;
std::string fuzzy_content = normalize_for_fuzzy_match(original_content);
std::string fuzzy_old = normalize_for_fuzzy_match(edits[i].old_text);
if (fuzzy_content.find(fuzzy_old) == std::string::npos) {
return {{"error", string_format(
"could not find edits[%zu].old_text in %s, it must match the file's current content exactly",
i, path.c_str())}};
}
any_fuzzy = true;
}
std::string base_content = any_fuzzy ? normalize_for_fuzzy_match(original_content) : original_content;
// uniqueness check always uses fuzzy-normalized text, so a whitespace-only duplicate still counts
std::vector<matched_edit> matched;
matched.reserve(edits.size());
for (size_t i = 0; i < edits.size(); i++) {
std::string needle = any_fuzzy ? normalize_for_fuzzy_match(edits[i].old_text) : edits[i].old_text;
size_t occurrences = count_occurrences(
normalize_for_fuzzy_match(original_content),
normalize_for_fuzzy_match(edits[i].old_text));
if (occurrences > 1) {
return {{"error", string_format(
"found %zu occurrences of edits[%zu].old_text in %s, it must be unique",
occurrences, i, path.c_str())}};
}
size_t idx = base_content.find(needle);
matched.push_back({i, idx, needle.size(), edits[i].new_text});
}
std::sort(matched.begin(), matched.end(), [](const matched_edit & a, const matched_edit & b) {
return a.match_index < b.match_index;
});
for (size_t i = 1; i < matched.size(); i++) {
if (matched[i - 1].match_index + matched[i - 1].match_length > matched[i].match_index) {
return {{"error", string_format(
"edits[%zu] and edits[%zu] overlap in %s; merge them into one edit or target disjoint regions",
matched[i - 1].edit_index, matched[i].edit_index, path.c_str())}};
}
}
std::string new_content = any_fuzzy
? apply_replacements_preserving_unchanged_lines(original_content, base_content, matched)
: apply_replacements(base_content, matched, 0);
if (new_content == original_content) {
return {{"error", "no changes made: the replacement(s) produced identical content"}};
}
if (!io->write_file(path, new_content)) {
return {{"error", "failed to write file: " + path}};
}
return {{"result", "file edited successfully"}, {"path", path}, {"edits_applied", (int) matched.size()}};
}
private:
// strip trailing whitespace, normalize smart quotes/dashes/spaces to ASCII
static std::string normalize_line_for_fuzzy_match(const std::string & line) {
size_t end = line.size();
while (end > 0 && (line[end - 1] == ' ' || line[end - 1] == '\t' || line[end - 1] == '\r')) {
end--;
}
std::string s = line.substr(0, end);
auto replace_all = [](std::string & str, const std::string & from, const std::string & to) {
if (from.empty()) return;
size_t pos = 0;
while ((pos = str.find(from, pos)) != std::string::npos) {
str.replace(pos, from.size(), to);
pos += to.size();
}
};
// smart single quotes -> '
for (unsigned char b : {0x98, 0x99, 0x9A, 0x9B}) {
replace_all(s, std::string("\xE2\x80") + (char) b, "'");
}
// smart double quotes -> "
for (unsigned char b : {0x9C, 0x9D, 0x9E, 0x9F}) {
replace_all(s, std::string("\xE2\x80") + (char) b, "\"");
}
// various dashes -> -
for (unsigned char b = 0x90; b <= 0x95; b++) {
replace_all(s, std::string("\xE2\x80") + (char) b, "-");
}
replace_all(s, "\xE2\x88\x92", "-"); // minus sign
// special spaces -> ' '
replace_all(s, "\xC2\xA0", " "); // no-break space
for (unsigned char b = 0x82; b <= 0x8A; b++) {
replace_all(s, std::string("\xE2\x80") + (char) b, " ");
}
replace_all(s, "\xE2\x80\xAF", " "); // narrow no-break space
replace_all(s, "\xE2\x81\x9F", " "); // medium mathematical space
replace_all(s, "\xE3\x80\x80", " "); // ideographic space
return s;
}
// applies the per-line transform above to every line; preserves line count/positions
static std::string normalize_for_fuzzy_match(const std::string & content) {
std::string result;
result.reserve(content.size());
size_t start = 0;
while (true) {
size_t nl = content.find('\n', start);
bool is_last = nl == std::string::npos;
std::string line = is_last ? content.substr(start) : content.substr(start, nl - start);
result += normalize_line_for_fuzzy_match(line);
if (is_last) break;
result += '\n';
start = nl + 1;
}
return result;
}
// lines with trailing '\n' kept, so untouched ones can be reconstructed verbatim
static std::vector<std::string> split_lines_with_endings(const std::string & content) {
std::vector<std::string> lines;
size_t start = 0;
while (start < content.size()) {
size_t nl = content.find('\n', start);
if (nl == std::string::npos) {
lines.push_back(content.substr(start));
break;
}
lines.push_back(content.substr(start, nl - start + 1));
start = nl + 1;
}
return lines;
}
struct line_span {
size_t start;
size_t end;
};
static std::vector<line_span> get_line_spans(const std::string & content) {
std::vector<line_span> spans;
size_t offset = 0;
for (const auto & line : split_lines_with_endings(content)) {
spans.push_back({offset, offset + line.size()});
offset += line.size();
}
return spans;
}
// count non-overlapping occurrences of `needle` in `content`
static size_t count_occurrences(const std::string & content, const std::string & needle) {
if (needle.empty()) return 0;
size_t count = 0, pos = 0;
while ((pos = content.find(needle, pos)) != std::string::npos) {
count++;
pos += needle.size();
}
return count;
}
struct matched_edit {
size_t edit_index;
size_t match_index; // offset into the "base content" (see below)
size_t match_length;
std::string new_text;
};
// replacements must be sorted ascending by match_index and non-overlapping
static std::string apply_replacements(
const std::string & content,
const std::vector<matched_edit> & replacements,
size_t offset) {
std::string result = content;
for (auto it = replacements.rbegin(); it != replacements.rend(); ++it) {
size_t local_index = it->match_index - offset;
result = result.substr(0, local_index) + it->new_text + result.substr(local_index + it->match_length);
}
return result;
}
// widen a replacement's byte range to the line(s) of `lines` it touches
static bool get_replacement_line_range(
const std::vector<line_span> & lines,
size_t match_index, size_t match_length,
size_t & out_start_line, size_t & out_end_line /* exclusive */) {
size_t replacement_start = match_index;
size_t replacement_end = match_index + match_length;
size_t start_line = (size_t) -1;
for (size_t i = 0; i < lines.size(); i++) {
if (replacement_start >= lines[i].start && replacement_start < lines[i].end) {
start_line = i;
break;
}
}
if (start_line == (size_t) -1) return false;
size_t end_line = start_line;
while (end_line < lines.size() && lines[end_line].end < replacement_end) {
end_line++;
}
if (end_line >= lines.size()) return false;
out_start_line = start_line;
out_end_line = end_line + 1;
return true;
}
// like apply_replacements, but untouched lines come from `original_content`
static std::string apply_replacements_preserving_unchanged_lines(
const std::string & original_content,
const std::string & base_content,
const std::vector<matched_edit> & replacements /* ascending, non-overlapping */) {
auto original_lines = split_lines_with_endings(original_content);
auto base_lines = get_line_spans(base_content);
struct group {
size_t start_line;
size_t end_line; // exclusive
std::vector<matched_edit> reps;
};
std::vector<group> groups;
for (const auto & rep : replacements) {
size_t start_line = 0, end_line = 0;
get_replacement_line_range(base_lines, rep.match_index, rep.match_length, start_line, end_line);
if (!groups.empty() && start_line < groups.back().end_line) {
groups.back().end_line = std::max(groups.back().end_line, end_line);
groups.back().reps.push_back(rep);
} else {
groups.push_back({start_line, end_line, {rep}});
}
}
size_t original_line_index = 0;
std::string result;
for (auto & g : groups) {
for (size_t i = original_line_index; i < g.start_line; i++) {
result += original_lines[i];
}
size_t group_start_offset = base_lines[g.start_line].start;
size_t group_end_offset = base_lines[g.end_line - 1].end;
std::string slice = base_content.substr(group_start_offset, group_end_offset - group_start_offset);
result += apply_replacements(slice, g.reps, group_start_offset);
original_line_index = g.end_line;
}
for (size_t i = original_line_index; i < original_lines.size(); i++) {
result += original_lines[i];
}
return result;
}
};
//
// get_datetime: returns the current date and time
//
struct server_tool_get_datetime : server_tool {
server_tool_get_datetime() {
name = "get_datetime";
display_name = "Get Date & Time";
permission_write = false;
}
json get_definition() const override {
return {
{"type", "function"},
{"function", {
{"name", name},
{"description", "Returns the current date and time in UTC"},
{"parameters", {
{"type", "object"},
{"properties", {
{"format", {
{"type", "string"},
{"description",
"strftime()-style format string for the output (default: \"%Y-%m-%dT%H:%M:%SZ\", "
"e.g. ISO 8601). Choose your own format if you need something else, "
"e.g. \"%A, %B %d %Y\" for a human-readable date."},
}},
}},
}},
}},
};
}
json invoke(json params, server_tool::stream *) const override {
std::string format = json_value(params, "format", std::string("%Y-%m-%dT%H:%M:%SZ"));
auto now = std::chrono::system_clock::now();
auto time = std::chrono::system_clock::to_time_t(now);
std::tm tm_utc;
#ifdef _WIN32
gmtime_s(&tm_utc, &time);
#else
gmtime_r(&time, &tm_utc);
#endif
char buf[256];
size_t len = std::strftime(buf, sizeof(buf), format.c_str(), &tm_utc);
if (len == 0) {
return {{"error", "invalid format string"}};
}
return {{"result", std::string(buf, len)}};
}
};
//
// get_info: returns runtime info (OS name/version and cwd)
//
static constexpr size_t SERVER_TOOL_GET_INFO_MAX_OUTPUT = 4096;
static constexpr int SERVER_TOOL_GET_INFO_TIMEOUT = 5; // seconds
struct server_tool_get_info : server_tool {
server_tool_get_info() {
name = "get_info";
display_name = "Get Runtime Info";
permission_write = false;
}
json get_definition() const override {
return {
{"type", "function"},
{"function", {
{"name", name},
{"description", "Returns runtime info: the OS name/version and the current working directory"},
{"parameters", {
{"type", "object"},
{"properties", json::object()},
}},
}},
};
}
json invoke(json params, server_tool::stream *) const override {
auto io = make_tools_io(params);
#ifdef _WIN32
auto res = io->run({"cmd", "/c", "ver"}, SERVER_TOOL_GET_INFO_MAX_OUTPUT, SERVER_TOOL_GET_INFO_TIMEOUT);
#else
auto res = io->run({"uname", "-a"}, SERVER_TOOL_GET_INFO_MAX_OUTPUT, SERVER_TOOL_GET_INFO_TIMEOUT);
#endif
// "ver" prints a blank line before the version, so the output is stripped on both ends;
// a failed spawn or a timeout leaves a diagnostic in res.output, which is not an OS name
std::string os_info = res.exit_code == 0 && !res.timed_out ? string_strip(res.output) : "unknown";
std::string cwd = json_value(params, "cwd", std::string());
if (cwd.empty()) {
std::error_code ec;
cwd = path_to_utf8(fs::current_path(ec));
}
return {
{"os", os_info},
{"cwd", cwd},
};
}
};
struct server_tool_stream_result : server_task_result {
std::string chunk;
bool done = false;
std::string error_msg;
json to_json() override {
if (!done) {
return {{"chunk", chunk}};
} else {
json result = {{"done", true}};
if (!error_msg.empty()) {
result["error"] = error_msg;
}
return result;
}
}
};
void server_tool::stream::push(const std::string & chunk) {
if (chunk.empty()) return;
auto r = std::make_unique<server_tool_stream_result>();
r->id = id;
r->chunk = chunk;
qr.send(std::move(r));
}
struct server_tools_res : server_http_res {
std::thread worker;
server_response * qr = nullptr; // set only for streaming responses
int id = -1;
~server_tools_res() override {
if (worker.joinable()) {
worker.join();
}
if (qr) {
qr->remove_waiting_task_id(id);
}
}
};
//
// server_mcp_tool: exposes one tool from a running MCP server as a server_tool.
//
struct server_mcp_tool : server_tool {
std::string server_name;
std::string tool_name;
server_mcp_tool_def def;
server_mcp & mcp_mgr;
server_mcp_tool(server_mcp_tool_def d, server_mcp & mgr)
: server_name(d.server_name)
, tool_name(d.name)
, def(std::move(d))
, mcp_mgr(mgr)
{
name = server_name + "_" + tool_name;
display_name = name;
permission_write = false;
support_stream = false;
}
std::string type() const override { return "mcp"; }
json get_definition() const override {
json schema = def.input_schema;
if (schema.is_null() || !schema.is_object()) {
schema = json::object();
}
return {
{"type", "function"},
{"function", {
{"name", name},
{"description", def.description},
{"parameters", schema},
}},
};
}
json invoke(json params, server_tool::stream *) const override {
return mcp_mgr.call_tool(server_name, tool_name, params);
}
};
static server_tool & find_tool(std::vector<std::unique_ptr<server_tool>> & tools, const std::string & name, bool require_stream) {
for (auto & t : tools) {
if (t->name == name) {
if (require_stream && !t->support_stream) {
throw std::invalid_argument(string_format("tool \"%s\" does not support stream = true", name.c_str()));
}
return *t;
}
}
throw std::invalid_argument(string_format("unknown tool \"%s\"", name.c_str()));
}
//
// public API
//
static std::vector<std::unique_ptr<server_tool>> build_tools() {
std::vector<std::unique_ptr<server_tool>> tools;
tools.push_back(std::make_unique<server_tool_read_file>());
tools.push_back(std::make_unique<server_tool_file_glob_search>());
tools.push_back(std::make_unique<server_tool_grep_search>());
tools.push_back(std::make_unique<server_tool_exec_shell_command>());
tools.push_back(std::make_unique<server_tool_write_file>());
tools.push_back(std::make_unique<server_tool_edit_file>());
tools.push_back(std::make_unique<server_tool_get_datetime>());
tools.push_back(std::make_unique<server_tool_get_info>());
return tools;
}
static std::string str_to_lower(const std::string & value) {
std::string lowered(value.size(), '\0');
std::transform(value.begin(), value.end(), lowered.begin(), [](unsigned char c) { return std::tolower(c); });
return lowered;
}
static std::string get_header(const std::map<std::string, std::string> & headers, const std::string & key, std::string default_value = "") {
const auto lowered_key = str_to_lower(key);
for (const auto & h : headers) {
if (str_to_lower(h.first) == lowered_key) {
return h.second;
}
}
return default_value;
}
void server_tools::setup(const std::vector<std::string> & enabled_tools,
server_mcp & mcp_mgr) {
if (!enabled_tools.empty()) {
if (!common_subproc::is_supported()) {
throw std::runtime_error("subprocess is not enabled on this build");
}
std::unordered_set<std::string> enabled_set(enabled_tools.begin(), enabled_tools.end());
auto all_tools = build_tools();
// collect all known tool names for validation
std::vector<std::string> known_names;
known_names.reserve(all_tools.size());
for (const auto & t : all_tools) {
known_names.push_back(t->name);
}
// validate that every requested tool is known
for (const auto & name : enabled_tools) {
if (name == "all") continue;
if (std::find(known_names.begin(), known_names.end(), name) == known_names.end()) {
throw std::runtime_error(string_format(
"unknown tool \"%s\". available tools: %s",
name.c_str(),
string_join(known_names, ", ").c_str()));
}
}
tools.clear();
for (auto & t : all_tools) {
if (enabled_set.count(t->name) > 0 || enabled_set.count("all") > 0) {
tools.push_back(std::move(t));
}
}
}
// append MCP tools, skipping any that collide with a built-in or another MCP tool of the same "<server>_<tool>" name
if (!mcp_mgr.empty()) {
std::unordered_set<std::string> seen_names;
for (auto & t : tools) {
seen_names.insert(t->name);
}
size_t n_added = 0;
for (const auto & def : mcp_mgr.list_tools()) {
std::string mcp_name = def.server_name + "_" + def.name;
if (seen_names.count(mcp_name)) {
SRV_WRN("MCP tool \"%s\" from server \"%s\" collides with an existing tool, skipping\n",
mcp_name.c_str(), def.server_name.c_str());
continue;
}
seen_names.insert(mcp_name);
tools.push_back(std::make_unique<server_mcp_tool>(def, mcp_mgr));
n_added++;
}
if (n_added > 0) {
SRV_INF("Added %zu MCP tools\n", n_added);
}
}
handle_get = [this](const server_http_req &) -> server_http_res_ptr {
auto res = std::make_unique<server_http_res>();
try {
json result = json::array();
for (const auto & t : tools) {
result.push_back(t->to_json());
}
res->data = safe_json_to_str(result);
} catch (const std::exception & e) {
SRV_ERR("got exception: %s\n", e.what());
res->status = 500;
res->data = safe_json_to_str(format_error_response(e.what(), ERROR_TYPE_SERVER));
}
return res;
};
handle_post = [this](const server_http_req & req) -> server_http_res_ptr {
auto res = std::make_unique<server_tools_res>();
try {
json body = json::parse(req.body);
std::string tool_name = body.at("tool").get<std::string>();
json params = body.value("params", json::object());
bool stream = body.value("stream", false);
// accept x-tool-cwd header to override of the process
auto cwd = get_header(req.headers, "x-tool-cwd");
if (!cwd.empty()) {
params["cwd"] = cwd;
}
server_tool & tool = find_tool(tools, tool_name, stream);
if (stream) {
int id = res_id.fetch_add(1);
queue_res.add_waiting_task_id(id);
res->qr = &queue_res;
res->id = id;
res->worker = std::thread([this, id, &req, &tool, params]() mutable {
server_tool::stream st{queue_res, id, [&req]() {
return !req.should_stop();
}};
auto done = std::make_unique<server_tool_stream_result>();
try {
tool.invoke(params, &st);
} catch (const std::exception & e) {
done->error_msg = e.what();
} catch (...) {
done->error_msg = "An unknown error occurred";
}
done->id = st.id;
done->done = true;
st.qr.send(std::move(done));
});
res->content_type = "text/event-stream";
res->status = 200;
res->next = [this, id](std::string & output) -> bool {
auto result = queue_res.recv(id);
auto * r = dynamic_cast<server_tool_stream_result *>(result.get());
GGML_ASSERT(r != nullptr);
output = "data: " + safe_json_to_str(r->to_json()) + "\n\n";
if (r->done) {
queue_res.remove_waiting_task_id(id);
return false;
}
return true;
};
} else {
json result = tool.invoke(params, nullptr);
res->status = 200;
res->data = safe_json_to_str(result);
}
} catch (const json::exception & e) {
res->status = 400;
res->data = safe_json_to_str(format_error_response(e.what(), ERROR_TYPE_INVALID_REQUEST));
} catch (const std::invalid_argument & e) {
res->status = 404;
res->data = safe_json_to_str(format_error_response(e.what(), ERROR_TYPE_INVALID_REQUEST));
} catch (const std::exception & e) {
SRV_ERR("got exception: %s\n", e.what());
res->status = 500;
res->data = safe_json_to_str(format_error_response(e.what(), ERROR_TYPE_SERVER));
}
return res;
};
}