Function agent_execute_tool_call

ds4_agent.c:7143–7201

Execute one parsed DSML tool call and return the text that will be appended as * the tool-role result. UI visualization already happened while streaming; this * function is only about side effects and the model-visible observation. */

    int start_line = 0, end_line = 0, delta = 0;
    agent_old_new_line_effect(data, len, out, out_len, offset, remove_len,
                              &start_line, &end_line, &delta);
    char *result = agent_edit_result(path, start_line, end_line, delta,
                                     out, out_len, kind);
    free(out);
    return result;
}

/* Old/new editing is intentionally conservative: exact old text must be unique.
 * For large replacements, old may contain one [upto] marker: the head must be
 * unique, and the tail must be unique after that head before the whole span is
 * replaced. */
static char *agent_tool_edit(agent_worker *w, const agent_tool_call *call) {
    const char *path = agent_tool_arg_value(call, "path");
    if (!path || !path[0]) return xstrdup("Tool error: edit requires path\n");
    const char *old = agent_tool_arg_value(call, "old");
    const char *new_text = agent_tool_arg_value(call, "new");
    if (!old || !old[0]) return xstrdup("Tool error: edit requires non-empty old text\n");
    if (!new_text) return xstrdup("Tool error: edit requires new text\n");

    char err[256];
    char *data = NULL;
    size_t len = 0;
    if (agent_read_file_bytes(path, &data, &len, err, sizeof(err)) != 0) {
        agent_buf b = {0};
        agent_buf_puts(&b, "Tool error: ");
        agent_buf_puts(&b, err);
        agent_buf_puts(&b, "\n");
        return agent_buf_take(&b);
    }

    const char *match = NULL;
    size_t match_len = 0;
    bool anchored = false;
    bool allow_upto = w && w->cfg && w->cfg->edit_upto;
    if (!agent_edit_find_old_span(data, len, old, allow_upto,
                                  &match, &match_len,
                                  &anchored, err, sizeof(err)))
    {
        free(data);
        agent_buf b = {0};
        agent_buf_puts(&b, "Tool error: ");
        agent_buf_puts(&b, err);
        agent_buf_puts(&b, "\n");
        return agent_buf_take(&b);
    }

    char *result = agent_apply_file_splice(path, data, len,
                                           (size_t)(match - data), match_len,
                                           new_text,
                                           anchored ? "anchored old/new replacement"
                                                    : "old/new replacement");
    free(data);
    return result;
}

typedef struct {
    const char *query;
    const char *glob;